Bimetallic seal

Abstract

A system and method including providing a ring-shaped bimetallic seal for an assembly. The bimetallic seal includes a first seal component formed of a first material, a second seal component formed of a second material different from the first material, and a junction formed between the first seal component and the second seal component. The bimetallic seal is configured to form a radial seal between a first assembly component and a second assembly component formed of different metal materials. Coefficients of thermal expansion (CTEs) of the first material and the second material are configured to maintain the radial seal between the different metal materials of the components of the assembly at extreme operating temperatures.

Description

BACKGROUND

[0001] Seals are used in many industrial applications to prevent leakage between components of an assembly. Advances in high temperature aerospace and racing applications increasingly use mating components formed of different materials having different thermal expansion characteristics. Conventional metallic seals formed of homogenous metallic materials can be over-compressed or under-compressed on the inner or outer diameter of the seal due to differences in the thermal expansion characteristics of the mating components when subjected to high temperatures in these applications, resulting in leakage upon cooling. Accordingly, there is a continuing demand in the industry to improve sealing technology for such applications. BRIEF DESCRIPTION OF DRAWINGS

[0002] For a more detailed understanding of the manner in which the feature and advantages of the implementations are achieved, reference can be made to the embodiments illustrated in the drawings. Understanding that these drawings only show some embodiments and are not to be considered limitations of the scope, as many other equally effective embodiments can be achieved by making simple changes thereto.

[0003] Figure 1 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0004] Figure 2 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0005] Figure 3 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0006] Figure 4 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0007] Figure 5 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0008] Figure 6 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0009] Figure 7 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0010] Figure 8 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0011] Figure 9 is a cross-sectional view of an assembly having a ring-shaped bimetallic seal according to embodiments of the present disclosure.

[0012] Figure 10 is a flowchart of a method of forming an annular bimetallic seal according to embodiments of the present disclosure.

[0013] Figure 11 is a cross-sectional view showing a stress profile of an annular bimetallic seal disposed in an assembly according to embodiments of the present disclosure.

[0014] The use of the same reference signs in different drawings indicates similar or identical items. DETAILED DESCRIPTION

[0015] Figure 1 is a partial cross-sectional view of an assembly 100 having an annular bimetallic seal 150 according to embodiments of the present disclosure. In some embodiments, the assembly 100 can include an engine duct assembly or an exhaust component of an aerospace engine. In other embodiments, the assembly 100 can include a turbine and exhaust component, or an exhaust component of a car engine. In still other embodiments, the assembly 100 can include a land-based power turbine oil mist system. In alternative embodiments, the assembly 100 can include any other suitable application requiring a fluid-tight seal. The assembly 100 can generally include a first assembly component 102 and a second assembly component 104. The first assembly component 102 can generally define an inner diameter (ID) of an annulus 106. In some embodiments, the first assembly component 102 can include a probe, a shaft, or an inner tube. The second assembly component 104 can generally be annularly disposed about the first assembly component 102 and define an outer diameter (OD) of the annulus 106. In some embodiments, the second assembly component 104 can include a housing or an outer tube.

[0016] Advances in high temperature applications can increasingly use mating components formed from different materials that have different thermal expansion characteristics. In some embodiments, the first assembly component 102 can generally be formed from a first metallic material, and the second assembly component 104 can be formed from a second metallic material that is different than the first metallic material. As such, the coefficient of thermal expansion (CTE) of the first metallic material forming the first assembly component 102 can be different than the CTE of the second metallic material forming the second assembly component 104. In some embodiments, the CTE of the first metallic material can be greater than the CTE of the second metallic material. However, in other embodiments, the CTE of the first metallic material can be less than the CTE of the second metallic material. In particular embodiments, the first metallic material can include steel or stainless steel. As such, the CTE of the first metal can be about 8.5 in / in-°F (15.3 cm / cm-°C), about 8.75 in / in-°F (15.75 cm / cm-°C), about 9 in / in-°F (16.2 cm / cm-°C), about 9.25 in / in-°F (16.65 cm / cm-°C), about 9.5 in / in-°F (17.1 cm / cm-°C), about 9.75 in / in-°F (17.55 cm / cm-°C), or about 10 in / in-°F (18.0 cm / cm-°C). In particular embodiments, the second metallic material can include titanium or a titanium alloy. As such, the CTE of the second metallic material can be about 4 in / in-°F (7.2 cm / cm-°C), about 4.25 in / in-°F (7.65 cm / cm-°C), about 4.5 in / in-°F (8.1 cm / cm-°C), about 4.75 in / in-°F (8.55 cm / cm-°C), or about 5 in / in-°F (9.0 cm / cm-°C).

[0017] The annular bimetallic seal 150 can generally be disposed within the torus 106 and between the first assembly component 102 and the second assembly component 104. In some embodiments, the seal 150 can include an interference fit between the first assembly component 102 and the second assembly component 104. Further, the seal 150 can be configured to provide a radial seal between the first assembly component 102 and the second assembly component 104. The seal 150 can generally include a first seal component 152, a second seal component 154, and a joint 156 formed between the first seal component 152 and the second seal component 154. As such, the first seal component 152 can be configured to form a radial seal with the first assembly component 102, and the second seal component 154 is configured to form a radial seal with the second assembly component 104.

[0018] The first seal component 152 can generally include an arcuate portion 158 that forms a radial seal with the first assembly component 102 and a joint feature 160. The second seal component 154 can generally include an arcuate portion 162 that forms a radial seal with the second assembly component 104 and a joint feature 164. In some embodiments, the joint feature 160 of the first seal component 152 can include a joint cavity 166 that includes opposing linear legs 168, 170 joined by an arcuate bend 172, and the joint feature 164 of the second seal component 154 can include a joint leg 174 that is received within the joint cavity 166 to form the joint 156. In some embodiments, the joint leg 174 can be linear. Further, in some embodiments, the joint leg 174 can extend substantially axially with respect to the torus 106. However, in alternative embodiments, the joint features 160, 164 can be reversed such that the first seal component 152 includes the joint feature 164 and the second seal component 154 includes the joint feature 160.

[0019] In some embodiments, one or more of the first seal component 152 and the second seal component 154 can be 3D printed or formed by any other suitable process. The joint 156 can generally be formed such that there is no leakage path between the first seal component 152 and the second seal component 154. In some embodiments, the joint 156 can be formed by 3D printing the first seal component 152 and the second seal component 154 such that the joint leg 174 of the second seal component 154 is inserted into the joint cavity 166 of the first seal component 152. In some embodiments, the joint 156 can be formed by physically inserting the joint leg 174 of the second seal component 154 into the joint cavity 166 of the first seal component 152 and then subjecting the joint to one or more joint formation processes, such as ultrasonic welding, laser sintering, mechanical crimping, cold rolling (coulombic bonding), brazing, or combinations thereof. In some embodiments, after the joint leg 174 is inserted into the joint cavity 166 and before the joint formation process is performed, the joint leg 174 can be in contact with one or more of the opposing linear legs 168, 170 of the joint cavity 166. Further, in some embodiments, the joint 156 can be formed by ultrasonic welding, laser sintering, mechanical crimping, cold rolling (coulombic bonding), brazing, 3D printing, or any combination thereof.

[0020] Because conventional metal seals formed from homogenous metal materials can be over-compressed on either the inner diameter or the outer diameter of the seal due to differences in the thermal expansion characteristics of the mating components 102, 104 of the assembly 100, forming a seal between different metal materials presents unique challenges at high operating temperatures. However, in some embodiments, the seal 150 can be formed from a bimetallic construction to compensate for the differences in the thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100.

[0021] Accordingly, in some embodiments, the first material of the first seal component 152 can be a metal material, and the second material of the second seal component 154 can be a metal material. Further, in some embodiments, the first material of the first seal component 152 can be different than the second material of the second seal component 154. By employing a bimetallic seal having seal components 152, 154 formed from different materials, the coefficient of thermal expansion (CTE) of the first material of the first seal component 152 can be different than the CTE of the second material of the second seal component 154. For example, in some embodiments, where the CTE of the first metal material of the first assembly component 102 is greater than the CTE of the second metal material of the second assembly component 104, the CTE of the first material of the first seal component 152 can be greater than the CTE of the second material of the second seal component 154. However, in embodiments where the CTE of the first metal material of the first assembly component 102 is lower than the CTE of the second metal material of the second assembly component 104, the CTE of the first material of the first seal component 152 can be lower than the CTE of the second material of the second seal component 154.

[0022] In some embodiments, the CTE of the first material of the first seal component 152 can be lower than the CTE of the first metal material of the first assembly component 102 and greater than the CTE of the second metal material of the second assembly component 104. In some embodiments, the first material of the first seal component 152 can include a nickel-chromium based alloy such as Inconel®, nickel-based alloys, nickel, titanium, or tungsten. Accordingly, the first material of the first seal component 152 can be configured to expand and / or contract at a similar or relative rate with respect to the first metal material of the first assembly component 102.

[0023] In some embodiments, the CTE of the first material of the first sealing component 152 can be the same as, at least 5% lower than, at least 10% lower than, at least 15% lower than, at least 20% lower than, at least 25% lower than, at least 30% lower than, at least 35% lower than, at least 40% lower than, or at least 50% lower than the CTE of the first metal material of the first component part 102. In some embodiments, the CTE of the first material of the first sealing component 152 can be no more than 95% lower, no more than 90% lower, no more than 85% lower, no more than 80% lower, no more than 75% lower, no more than 65% lower, no more than 60% lower, no more than 55% lower, or no more than 50% lower than the CTE of the first metal material of the first component part 102. Further, it should be appreciated that the CTE of the first material of the first sealing component 152 can be between any of these minimum and maximum values, such as at least 5% lower to no more than 95% lower, or even at least 20% lower to no more than 30% lower than the CTE of the first metal material of the first component part 102.

[0024] In some embodiments, the CTE of the second material of the second sealing component 154 can be greater than the CTE of the second metal material of the second component part 104 and lower than the CTE of the first metal material of the first component part 102. Additionally, in some embodiments, the second material of the second sealing component 154 can comprise a nickel-molybdenum-chromium alloy such as In some embodiments, the CTE of the second material of the second sealing component 154 can be greater than the CTE of the second metal material of the second component part 104 and lower than the CTE of the first metal material of the first component part 102. Additionally, in some embodiments, the second material of the second sealing component 154 can comprise a nickel-molybdenum-chromium alloy such as

[0025] In some embodiments, the CTE of the second material of the second sealing component 154 can be the same as, at least 5% greater than, at least 10% greater than, at least 15% greater than, at least 20% greater than, at least 25% greater than, at least 30% greater than, at least 35% greater than, at least 40% greater than, at least 45% greater than, at least 50% greater than, at least 55% greater than, at least 60% greater than, at least 65% greater than, at least 70% greater than, or at least 75% greater than the CTE of the second metal material of the second component part 104. In some embodiments, the CTE of the second material of the second sealing component 154 can be no more than 100% greater, no more than 95% greater, no more than 90% greater, no more than 85% greater, no more than 80% greater, or no more than 75% greater than the CTE of the second metal material of the second component part 104. Further, it should be appreciated that the CTE of the second material of the second sealing component 154 can be between any of these minimum and maximum values, such as at least 5% greater to no more than 95% greater, or even at least 65% greater to no more than 75% greater than the CTE of the second metal material of the second component part 104.

[0026] Figure 2 is a partial cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 250 in accordance with embodiments of the present disclosure. The seal 250 can generally be substantially similar to the seal 150 and include a first seal component 252, a second seal component 254, and a joint 256 formed between the first and second seal components 252, 254. The first seal component 252 can generally include an arcuate portion 258 that forms a radial seal with the first assembly component 102 and a joint feature 260. The second seal component 254 can generally include an arcuate portion 262 that forms a radial seal with the second assembly component 104 and a joint feature 264. Additionally, in some embodiments, the second seal component 254 can include a straight portion 276 disposed between the arcuate portion 262 and the joint feature 264. However, in some embodiments, the first seal component 252 can include a straight portion disposed between the arcuate portion 258 and the joint feature 260 that is substantially similar to the straight portion 276.

[0027] In some embodiments, the joint feature 260 of the first seal component 252 can include a joint cavity 266 that includes opposing straight legs 268, 270 joined by an arcuate bend 272, and the joint feature 264 of the second seal component 254 can include a joint leg 274 that is received within the joint cavity 266 to form the joint 256. However, in alternative embodiments, the joint features 260, 264 can be reversed such that the first seal component 252 includes the joint feature 264 and the second seal component 254 includes the joint feature 260. Further, it should be appreciated that the seal 250 can be formed of bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in substantially similar fashion to the seal 150. The joint 256 can also be formed in substantially similar fashion to that disclosed with reference to the seal 150.

[0028] Figure 3is a partial cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 350 according to embodiments of the present disclosure. The seal 350 can generally be substantially similar to the seal 150 and include a first seal component 352, a second seal component 354, and a joint 356 formed between the first and second seal components 352, 354. The first seal component 352 can generally include an arcuate portion 358 that forms a radial seal with the first assembly component 102 and a joint feature 360. In some embodiments, the arcuate portion 358 can include a variable radius such that the joint feature is substantially radially oriented and / or a joint cavity 366 is open toward the second assembly component 104. The second seal component 354 can generally include an arcuate portion 362 that forms a radial seal with the second assembly component 104 and a joint feature 364. Additionally, in some embodiments, the second seal component 354 can include an opposing arcuate portion 378 disposed between the arcuate portion 362 and the joint feature 364 such that a joint leg 374 is substantially radially oriented and / or extends toward the first assembly component 102.

[0029] In some embodiments, the joint feature 360 of the first seal component 352 can include a joint cavity 366 that includes opposing linear legs 368, 370 joined by an arcuate bend 372 and the joint feature 364 of the second seal component 354 can include a joint leg 374 that is received within the joint cavity 366 to form the joint 356. In some embodiments, the joint 356 can be substantially radially oriented. However, in alternative embodiments, the joint features 360, 364 can be reversed such that the first seal component 352 includes the joint feature 364 and the second seal component 354 includes the joint feature 360. Further, it should be appreciated that the seal 350 can be formed of bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in substantially similar manners to one or more of the seals 150. The joint 356 can also be formed in substantially similar manners to those disclosed with reference to the seal 150. Alternative embodiments of the seal 350 can include any number of arcuate convolutions and / or linear portions to form a bimetallic seal suitable for operation in the assembly 100.

[0030] Figure 4 is a partial cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 450 according to embodiments of the present disclosure.

[0031] Seal 450 can generally be substantially similar to one or more of seals 150, 250, and include a first seal component 452, a second seal component 454, and a joint 456 formed between first and second seal components 452, 454. First seal component 452 can generally include an arcuate portion 458 that forms a radial seal with first assembly component 102 and a joint feature 464. Second seal component 454 can generally include an arcuate portion 462 that forms a radial seal with second assembly component 104 and a joint feature 460. Additionally, in some embodiments, second seal component 454 can include a straight portion 476 disposed between arcuate portion 462 and joint feature 460. However, in some embodiments, first seal component 252 can include a straight portion disposed between arcuate portion 458 and joint feature 464 that is substantially similar to straight portion 476.

[0032] In some embodiments, joint feature 464 of first seal component 452 can include a joint leg 474 having a plurality of opposing arcuate convolutions 480 that form a sealing ridge around the circumference of joint leg 474, and joint feature 460 of second seal component 454 can include a joint cavity 466 that includes opposing straight legs 468, 470 joined by an arcuate bend 472. In some embodiments, opposing arcuate convolutions 480 can strengthen joint 456. In some embodiments, joint 456 can be substantially axially oriented. However, in alternative embodiments, joint features 460, 464 can be reversed such that first seal component 452 includes joint feature 460 and second seal component 454 includes joint feature 164, such as joint features shown with respect to seal 250. Further, it should be appreciated that seal 450 can be formed of bimetallic construction so as to compensate for differences in thermal expansion characteristics of respective mating components 102, 104 of assembly 100 in substantially similar fashion to one or more of seals 150, 250. Joint 456 can also be formed in substantially similar fashion to that disclosed with respect to seal 150. Alternative embodiments of seal 450 can include any number of arcuate convolutions and / or straight portions to form a bimetallic seal suitable for operation in assembly 100.

[0033] Figure 5is a partial cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 550 according to embodiments of the present disclosure. The seal 550 can generally be substantially similar to the seal 150 and include a first seal component 552, a second seal component 554, and a joint 556 formed between the first seal component 552 and the second seal component 554. The first seal component 552 can generally include an arcuate portion 558 that forms a radial seal with the first assembly component 102 and a joint feature 560. In some embodiments, the first seal component 552 can also include a straight portion 582 disposed between the arcuate portion 558 and the joint feature 560. The second seal component 554 can generally include an arcuate portion 562 that forms a radial seal with the second assembly component 104 and a joint feature 564. In some embodiments, the second seal component 554 can include a straight portion 576 disposed between the arcuate portion 562 and the joint feature 564. However, in some embodiments, the first seal component 552 and / or the second seal component 554 can be devoid of the straight portions 580, 576, respectively.

[0034] In some embodiments, the joint feature 560 of the first seal component 552 can include an arcuate joint portion and the joint feature 564 of the second seal component 554 can include a complementary arcuate joint portion. In some embodiments, the arcuate joint portion of the first seal component 552 and the complementary arcuate joint portion of the second seal component 554 can at least partially overlap. Thus, in some embodiments, each of the seal components 552, 554 can include a uniform thickness. Accordingly, in some embodiments, the overlapping arcuate joint portions of the first seal component 552 and the second seal component 554 can include a thickness that is greater than the thickness of the individual seal components 552, 554. Further, it should be appreciated that the seal 550 can be formed of a bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in a substantially similar manner as the seal 150. The joint 556 can also be formed in a substantially similar manner as disclosed with reference to the seal 150.

[0035] Figure 6is a cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 650 according to embodiments of the present disclosure. The seal 650 can generally be substantially similar to one or more of the seals 150, 550 and includes a first seal component 652, a second seal component 654, and a joint 656 formed between the first and second seal components 652, 654. The first seal component 652 can generally include an arcuate portion 658 that forms a radial seal with the first assembly component 102 and a joint feature 560. The second seal component 654 can generally include an arcuate portion 662 that forms a radial seal with the second assembly component 104 and a joint feature 664. However, in some embodiments, the first and / or second seal components 652, 654 can include a straight portion disposed between their respective arcuate portions 658, 662 and joint features 660, 664.

[0036] In some embodiments, the joint feature 660 of the first seal component 652 can include an arcuate joint portion and the joint feature 664 of the second seal component 654 can include a complementary arcuate joint portion. In some embodiments, the arcuate joint portion of the first seal component 652 and the complementary arcuate joint portion of the second seal component 654 can at least partially overlap. Further, in some embodiments, the arcuate joint portion of the first seal component 652 and the complementary arcuate joint portion of the second seal component 654 can be tapered or arcuate-tapered such that the seal 650 can include a substantially uniform thickness. Further, it should be appreciated that the seal 650 can be formed from a bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in substantially similar fashion to one or more of the seals 150, 550. The joint 656 can also be formed in substantially similar fashion to that disclosed with reference to one or more of the seals 150, 550.

[0037] Figure 7is a cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 750 in accordance with embodiments of the present disclosure. The seal 750 can generally be substantially similar to the seal 150 and include a first seal component 752, a second seal component 754, and a joint 756 formed between the first and second seal components 752, 754. The first seal component 752 can generally include an arcuate portion 758 that forms a radial seal with the first assembly component 102 and a joint feature 760. The second seal component 754 can generally include an arcuate portion 762 that forms a radial seal with the second assembly component 104 and a joint feature 764. However, in some embodiments, the first and / or second seal components 752, 754 can include a straight portion disposed between their respective arcuate portions 758, 762 and joint features 760, 764.

[0038] In some embodiments, the joint feature 760 of the first seal component 752 can include a straight joint portion and the joint feature 764 of the second seal component 754 can include a straight joint portion. Additionally, the joint 756 can include a retainer 790 having a first cavity 792 configured to at least partially receive the straight joint portion of the joint feature 760 of the first seal component 752 and a second cavity 794 opposite the first cavity 792 and configured to at least partially receive the straight joint portion of the joint feature 764 of the second seal component 754. In some embodiments, the straight portion of the first seal component 752 and the straight joint portion of the second seal component 754 can be radially aligned. Accordingly, in some embodiments, the retainer 790 can be at least partially disposed radially between the first and second seal components 752, 754. Further, it should be appreciated that the seal 750 can be formed of bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in substantially similar fashion to the seal 150. The joint 756 can also be formed in substantially similar fashion to that disclosed with reference to the seal 150.

[0039] Figure 8is a cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 850 in accordance with embodiments of the present disclosure. The seal 850 can generally be substantially similar to one or more of the seals 150, 750 and includes a first seal component 852, a second seal component 854, and a joint 856 formed between the first and second seal components 852, 854. The first seal component 852 can generally include an arcuate portion 858 that forms a radial seal with the first assembly component 102 and a joint feature 860. The second seal component 854 can generally include an arcuate portion 862 that forms a radial seal with the second assembly component 104 and a joint feature 864. However, in some embodiments, the first and / or second seal components 852, 854 can include a straight portion disposed between their respective arcuate portions 858, 862 and joint features 860, 864.

[0040] In some embodiments, the joint feature 860 of the first seal component 852 can include a straight joint portion and the joint feature 864 of the second seal component 854 can include a straight joint portion. Additionally, the joint 856 can include a retainer 890 having a cavity 896 configured to at least partially receive the straight joint portion of the joint feature 860 of the first seal component 852 and the straight joint portion of the joint feature 864 of the second seal component 854. In some embodiments, the straight portion of the first seal component 852 and the straight joint portion of the second seal component 854 can be held in contact by the retainer 890. Furthermore, it should be appreciated that the seal 850 can be formed of bimetallic construction so as to compensate for differences in thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100 in substantially similar fashion to one or more of the seals 150, 750. The joint 856 can also be formed in substantially similar fashion to that disclosed with reference to one or more of the seals 150, 750.

[0041] Figure 9is a cross-sectional view of an assembly 100 having a ring-shaped bimetallic seal 950 according to embodiments of the present disclosure. The seal 950 can generally represent any of the seals 150, 250, 350, 450, 550, 650, 750, 850 disclosed herein, and includes a first seal component 952, a second seal component 954, and a junction 956. However, in some embodiments, the seal 950 can include one or more support rings 992, 994. In some embodiments, the seal 950 can include a support ring 992 disposed within the first seal component 952. In some embodiments, the support ring 992 can be disposed adjacent to an inner diameter (ID) of the torus 106 of the assembly 100. In some embodiments, the support ring 992 can generally be configured to exert a radial force on the first seal component 952 toward the ID. In some embodiments, the seal 950 can include a support ring 994 disposed within the second seal component 954. In some embodiments, the support ring 994 can be disposed adjacent to an outer diameter (OD) of the torus 106 of the assembly 100. In some embodiments, the support ring 994 can generally be configured to exert a radial force on the second seal component 954 toward the OD. Further, in some embodiments, the seal 950 can include both support rings 992, 994.

[0042] In some embodiments, the support rings 992, 994 can include solid rings. In some embodiments, the support rings 992, 994 can include hollow rings. In some embodiments, the support rings 992, 994 can include “key ring” springs or other elastic springs. Further, in some embodiments, the support rings 992, 994 can include any combination of solid rings, hollow rings, key ring springs, or other elastic springs. The support rings 992, 994 can generally be formed from an elastic metallic material, such as a nickel-molybdenum-chromium alloy such as In some embodiments, the support rings 992, 994 can include a coating and / or surface treatment, such as a nitrided or carbonitrided surface treatment.

[0043] In some embodiments, the support ring 992 can be formed of the same material as the first assembly component 102, the first seal component 952, or a combination thereof. In some embodiments, the support ring 994 can be formed of the same material as the second assembly component 104, the second seal component 954, or a combination thereof. For example, if the first assembly component 102 is formed of a 300 series stainless steel, the support ring 992 can also be formed of a 300 series stainless steel. In some embodiments, the support ring 992 can be formed of a different material than the first assembly component 102, the first seal component 952, or a combination thereof. In some embodiments, the support ring 994 can be formed of a different material than the second assembly component 104, the second seal component 954, or a combination thereof. For example, if the first assembly component 102 is formed of a 300 series stainless steel, the support ring 992 can be formed of a 718 stainless steel. Thus, it should be understood that the support rings 992, 994 can include a CTE that is substantially similar to one or more of their respective components 102, 952, 104, 954 in order to function according to embodiments of the seals 150, 250, 350, 450, 550, 650, 750, 850 disclosed herein.

[0044] The support rings 992, 994 can generally be utilized when the first assembly component 952 and / or the second assembly component 954 are formed of a material that does not provide sufficient strength, such as a 300 series stainless steel. This can occur when the material of the first seal component 952 and / or the second seal component 952 is selected based on CTE. As disclosed herein, the material can be selected based on CTE to closely align the CTE of the various assembly components 102, 104 and the corresponding seal components 952, 954. Thus, the support rings 992, 994 can provide increased rigidity to the seal 950 while also allowing the seal to reliably perform at elevated temperatures, such as temperatures of at least 1000 degrees Fahrenheit (approximately 535 degrees Celsius) or greater.

[0045] Embodiments of the seal 150, 250, 350, 450, 550, 650, 750, 850, 950 can include any size suitable for the particular application in the assembly 100. In some embodiments, the ID of the torus 106 and / or the ID of the bimetallic seal 150, 250, 350, 450, 550, 650, 750, 850, 950 can be at least 5 mm, at least 6 mm, at least 7 mm, at least 8 mm, at least 9 mm, at least 10 mm, at least 25 mm, at least 50 mm, at least 75 mm, at least 100 mm, at least 150 mm, at least 200 mm, at least 250 mm, at least 300 mm, or even larger. In some embodiments, the OD of the torus 106 and / or the OD of the bimetallic seal 150, 250, 350, 450, 550, 650, 750, 850, 950 can be at least 10 mm, at least 11 mm, at least 12 mm, at least 13 mm, at least 14 mm, at least 15 mm, at least 25 mm, at least 50 mm, at least 75 mm, at least 100 mm, at least 150 mm, at least 200 mm, at least 250 mm, at least 300 mm, at least 500 mm, at least 1000 mm, or even larger.

[0046] Figure 10is a flowchart of a method 1000 of forming annular bimetallic seals 150, 250, 350, 450, 550, 650, 750, 850, 950 according to embodiments of the present disclosure. The method 1000 can begin at block 1002 with forming a first seal component 152, 252, 352, 452, 552, 652, 752, 852. In some embodiments, forming the first seal component 152, 252, 352, 452, 552, 652, 752, 852 can include 3D printing the first seal component 152, 252, 352, 452, 552, 652, 752, 852. The method 1000 can continue at block 1004 with forming a second seal component 154, 254, 354, 454, 554, 654, 754, 854. In some embodiments, forming the second seal component can include 3D printing the second seal component. The method 1000 can continue at block 1006 with forming a joint 156, 256, 356, 456, 556, 656, 756, 856 between the first seal component 152, 252, 352, 452, 552 and the second seal component 154, 254, 354, 454, 554.In some embodiments, forming a joint 156, 256, 356, 456, 556, 656, 756, 856 between the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 and the second sealing component 154, 254, 354, 454, 554, 654, 754, 854 can include ultrasonic welding the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 to the second sealing component 154, 254, 354, 454, 554, 654, 754, 854; laser sintering the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 to the second sealing component 154, 254, 354, 454, 554, 654, 754, 854; mechanically crimping the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 to the second sealing component 154, 254, 354, 454, 554, 654, 754, 854; cold rolling (coulomb bonding) the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 to the second sealing component 154, 254, 354, 454, 554, 654, 754, 854; brazing the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 to the second sealing component 154, 254, 354, 454, 554, 654, 754, 854; 3D printing the first sealing component 152, 252, 352, 452, 552, 652, 752, 852 or the second sealing component 154, 254, 354, 454, 554, 654, 754, 854 about the other; or a combination thereof.

[0047] In some embodiments, the method 1000 can further include installing the bimetallic seal 150, 250, 350, 450, 550, 650, 750, 850 between the first component part 102 and the second component part 104 formed of different metallic materials such that the first seal part 152, 252, 352, 452, 552, 652, 752, 852 forms a radial seal with the first component part 102 and the second seal part 154, 254, 354, 454, 554, 654, 754, 854 forms a radial seal with the second component part 104. In some embodiments, the method 1000 can further include subjecting the bimetallic seal 150, 250, 350, 450, 550, 650, 750, 850, 950 to an operating temperature of at least 500 degrees Fahrenheit (about 260 degrees Celsius), at least 600 degrees Fahrenheit (about 315 degrees Celsius), at least 700 degrees Fahrenheit (about 370 degrees Celsius), at least 800 degrees Fahrenheit (about 425 degrees Celsius), at least 900 degrees Fahrenheit (about 480 degrees Celsius), or at least 1000 degrees Fahrenheit (about 535 degrees Celsius); and maintaining a fluid-tight seal between the first component part 102 and the second component part 104.

[0048] Figure 11 is a cross-sectional view showing a stress profile of an annular bimetallic seal 250 disposed in an assembly 100 according to embodiments of the present disclosure. While the seal 250 is depicted, it should be understood that the stress profile of any of the embodiments of the seals 150, 350, 450, 550, 650, 750, 850, 950 can exhibit substantially similar performance. In the depicted embodiment, the first component part 102 can be formed of stainless steel 304 having a CTE of about 10 pm / in-°F and the second component part 104 can be formed of titanium 6242 having a CTE of about 4 pm / in-°F. In an exemplary embodiment, the first seal part 252 is formed of Inconel having a CTE of about 7.8 pm / in-°F and the second seal part can be formed of Inconel having a CTE of 6.5 pm / in-°F. Exemplary embodiments were tested at 1000 °F. A conventional seal formed of a homogenous metallic material tested in this manner can exceed 100,000 pounds per square inch (about 690 MPa) at either the inner seal foot or the outer seal foot, while the other seal foot can experience a stress of about 50,000 psi (about 345 MPa), a difference of about 50,000 psi (about 345 MPa), which can result in a loss of seal and / or overall failure of the conventional seal.

[0049] The stress measured where the first seal component 252 contacts the first assembly component 102 is about 46,000 psi (about 317 MPa), and the stress measured where the second seal component 254 contacts the second assembly component 104 is about 53,000 psi (about 365 MPa). The stress in the joint 256 can also be some of the lowest stresses present in the seal 250. The stress differential is about 7,000 psi (about 48 MPa). At these operating temperatures, the seals 150, 250, 350, 450, 550, 650, 750, 850, 950 can maintain an appropriate radial seal between the first assembly component 102 and the second assembly component 104. This can be due in part to the stresses in each of the seal components 252, 254 being substantially similar as shown. In some embodiments, the difference between the stresses in the first seal component 152, 252, 352, 452, 552, 652, 752, 852 and the second seal component 154, 254, 354, 454, 554, 654, 754, 854 in the seals 150, 250, 350, 450, 550, 650, 750, 850, 950 can not exceed 100 k psi (about 690 MPa), not exceed 90 k psi (about 620 MPa), not exceed 80 k psi (about 550 MPa), not exceed 70 k psi (about 480 MPa), not exceed 60 k psi (about 415 MPa), not exceed 50 k psi (about 345 MPa), not exceed 25 k psi (about 175 MPa), not exceed 20 k psi (about 140 MPa), not exceed 15 k psi (about 105 MPa), not exceed 10 k psi (about 70 MPa), not exceed 7 k psi (about 50 MPa), or not exceed 5 k psi (about 35 MPa). Thus, it should be understood that embodiments of the bimetallic seals 150, 250, 350, 450, 550, 650, 750, 850, 950 disclosed herein are suitable for providing a fluid-tight seal in an annulus formed between different metallic materials of mating components 102, 104 in an assembly 100 at elevated temperatures, and thus can compensate for differences in the thermal expansion characteristics of the respective mating components 102, 104 of the assembly 100.

[0050] Embodiments of the assembly 100, the annular bimetallic seal 150, 250, 350, 450, 550, 650, 750, 850, 950, and / or the method 1000 can include one or more of the following:

[0051] Embodiment 1. An annular bimetallic seal comprising: a first seal component formed of a first material; a second seal component formed of a second material different from the first material; and a junction formed between the first seal component and the second seal component.

[0052] Embodiment 2. The bimetallic seal of embodiment 1, wherein the first seal component is configured to form a radial seal with a first assembly component, and wherein the second seal component is configured to form a radial seal with a second assembly component.

[0053] Embodiment 3. An assembly comprising: a first assembly component; a second assembly component disposed about the first assembly component; and an annular bimetallic seal disposed between the first assembly component and the second assembly component, the seal comprising: a first seal component formed of a first material and configured to form a radial seal with the first assembly component; a second seal component formed of a second material different from the first material and configured to form a radial seal with the second assembly component; and a junction formed between the first seal component and the second seal component.

[0054] Embodiment 4. The bimetallic seal of any one of embodiments 1-2 or the assembly of embodiment 3, wherein the first assembly component defines an inner diameter (ID) of an annulus, and wherein the second assembly component defines an outer diameter (OD) of the annulus.

[0055] Embodiment 5. The bimetallic seal or assembly of any one of embodiments 1-4, wherein the first seal component comprises: (1) an arcuate portion that forms the radial seal with the first assembly component, and (2) a junction feature.

[0056] Embodiment 6. The bimetallic seal or assembly of embodiment 5, wherein the first seal component comprises a straight portion disposed between the arcuate portion and the junction feature.

[0057] Embodiment 7. The bimetallic seal or assembly of any one of embodiments 1-6, wherein the second seal component comprises: (1) an arcuate portion that forms the radial seal with the second assembly component, and (2) a junction feature.

[0058] Embodiment 8. The bimetallic seal or assembly of embodiment 7, wherein the second seal component comprises a straight portion disposed between the arcuate portion and the junction feature.

[0059] Embodiment 9. The bi-metallic seal or assembly of any one of embodiments 7-8, wherein the engagement feature of the first seal component is an engagement cavity, and wherein the engagement feature of the second seal component is an engagement foot received within the engagement cavity to form the engagement.

[0060] Embodiment 10. The bi-metallic seal or assembly of embodiment 9, wherein the engagement foot is straight.

[0061] Embodiment 11. The bi-metallic seal or assembly of embodiment 9, wherein the engagement foot comprises opposing arcuate convolutions forming a ridge along a circumference of the engagement foot.

[0062] Embodiment 12. The bi-metallic seal or assembly of any one of embodiments 10-11, wherein the engagement foot extends substantially axially or substantially radially.

[0063] Embodiment 13. The bi-metallic seal or assembly of any one of embodiments 7-8, wherein the engagement feature of the first seal component comprises an arcuate engagement portion, and wherein the engagement feature of the second seal component comprises a complementary arcuate engagement portion, and wherein the arcuate engagement portion and the complementary arcuate engagement portion at least partially overlap.

[0064] Embodiment 14. The bi-metallic seal or assembly of any one of embodiments 7-8, wherein the bi-metallic seal comprises a retainer having a first cavity configured to at least partially receive the first seal component and having a second cavity opposite the first cavity and configured to at least partially receive the second seal component, and wherein the retainer is disposed at least partially radially between the first seal component and the second seal component.

[0065] Embodiment 15. The bi-metallic seal or assembly of embodiment 14, wherein the bi- metallic seal comprises a retainer having a cavity configured to at least partially receive the first seal component and the second seal component, and wherein the first seal component and the second seal component are held in contact by the retainer.

[0066] Embodiment 16. The bi-metallic seal or assembly of any one of embodiments 1-15, wherein the first assembly component is formed of a first metallic material, and wherein the second assembly component is formed of a second metallic material different from the first metallic material.

[0067] Embodiment 17. The bimetallic seal or assembly of embodiment 16, wherein a coefficient of thermal expansion (CTE) of the first metallic material is different than a CTE of the second metallic material.

[0068] Embodiment 18. The bimetallic seal or assembly of embodiment 17, wherein the CTE of the first metallic material is greater than the CTE of the second metallic material.

[0069] Embodiment 19. The bimetallic seal or assembly of embodiment 18, wherein the first metallic material comprises steel or stainless steel.

[0070] Embodiment 20. The bimetallic seal or assembly of embodiment 19, wherein the second metallic material comprises titanium or a titanium alloy.

[0071] Embodiment 21. The bimetallic seal or assembly of any one of embodiments 1-20, wherein the first material of the first sealing component is a metallic material, and wherein the second material of the second sealing component is a metallic material, and wherein the first material is different than the second material.

[0072] Embodiment 22. The bimetallic seal or assembly of embodiment 21, wherein a coefficient of thermal expansion (CTE) of the first material of the first sealing component is different than a CTE of the second material of the second sealing component.

[0073] Embodiment 23. The bimetallic seal or assembly of embodiment 22, wherein the CTE of the first material of the first sealing component is greater than the CTE of the second material of the second sealing component.

[0074] Embodiment 24. The bimetallic seal or assembly of embodiment 23, wherein the CTE of the first material of the first sealing component is lower than the CTE of the first metallic material of the first assembly component and greater than the CTE of the second metallic material of the second assembly component.

[0075] Embodiment 25. The bimetallic seal or assembly of embodiment 24, wherein the CTE of the second material of the second sealing component is greater than the CTE of the second metallic material of the second assembly component and lower than the CTE of the first metallic material of the first assembly component.

[0076] Embodiment 26. The bimetallic seal or assembly of any one of embodiments 21-25, wherein the first material of the first sealing component comprises a nickel-chromium based alloy such as Inconel®, Incoloy®, Hastelloy®, Monel®, nickel-based alloy, nickel, titanium, or tungsten.

[0077] Embodiment 27. The bimetallic seal or assembly of any one of embodiments 21-26, wherein the second material of the second sealing component comprises a nickel-molybdenum-chromium alloy such as stainless steel, spring steel, steel, aluminum, zinc, copper, magnesium, tin, platinum, lead, iron, or bronze.

[0078] Embodiment 28. The bimetallic seal or assembly of any one of embodiments 17-27, wherein the CTE of the first material of the first sealing component is the same as, at least 5% lower than, at least 10% lower than, at least 15% lower than, at least 20% lower than, at least 25% lower than, at least 30% lower than, at least 35% lower than, at least 40% lower than, or at least 50% lower than the CTE of the first metallic material of the first assembly component.

[0079] Embodiment 29. The bimetallic seal or assembly of any one of embodiments 17-28, wherein the CTE of the first material of the first sealing component is no more than 95% lower than, no more than 90% lower than, no more than 85% lower than, no more than 80% lower than, no more than 75% lower than, no more than 65% lower than, no more than 60% lower than, no more than 55% lower than, or no more than 50% lower than the CTE of the first metallic material of the first assembly component.

[0080] Embodiment 30. The bimetallic seal or assembly of any one of embodiments 17-29, wherein the CTE of the second material of the second sealing component is the same as, at least 5% greater than, at least 10% greater than, at least 15% greater than, at least 20% greater than, at least 25% greater than, at least 30% greater than, at least 35% greater than, at least 40% greater than, at least 45% greater than, at least 50% greater than, at least 55% greater than, at least 60% greater than, at least 65% greater than, at least 70% greater than, or at least 75% greater than the CTE of the second metallic material of the second assembly component.

[0081] Embodiment 31. The bimetallic seal or assembly of any one of embodiments 17-30, wherein the CTE of the second material of the second sealing component is no more than 100% greater than, no more than 95% greater than, no more than 90% greater than, no more than 85% greater than, no more than 80% greater than, or no more than 75% greater than the CTE of the second metallic material of the second assembly component.

[0082] Embodiment 32. The bimetallic seal or assembly of any one of embodiments 1-31, wherein the joint is formed by ultrasonic welding, laser sintering, mechanical crimping, cold rolling (Coulomb bonding), brazing, 3D printing, or any combination thereof.

[0083] Embodiment 33. The bimetallic seal or assembly of Embodiment 32, wherein the joint has no leak path.

[0084] Embodiment 34. The bimetallic seal or assembly of any one of Embodiments 4-33, wherein the ID of the annulus is at least 5 mm, at least 6 mm, at least 7 mm, at least 8 mm, at least 9 mm, at least 10 mm, at least 25 mm, at least 50 mm, at least 75 mm, at least 100 mm, at least 150 mm, at least 200 mm, at least 250 mm, at least 300 mm, at least 500 mm, or even larger.

[0085] Embodiment 35. The bimetallic seal or assembly of any one of Embodiments 4-34, wherein the OD of the annulus is at least 10 mm, at least 11 mm, at least 12 mm, at least 13 mm, at least 14 mm, at least 15 mm, at least 25 mm, at least 50 mm, at least 75 mm, at least 100 mm, at least 150 mm, at least 200 mm, at least 250 mm, at least 300 mm, at least 500 mm, at least 1000 mm, or even larger.

[0086] Embodiment 36. The bimetallic seal or assembly of any one of Embodiments 1-35, wherein the bimetallic seal is adapted to maintain a fluid-tight seal between the first assembly component and the second assembly component at operating temperatures of at least 500 degrees Fahrenheit (about 260 degrees Celsius), at least 600 degrees Fahrenheit (about 315 degrees Celsius), at least 700 degrees Fahrenheit (about 370 degrees Celsius), at least 800 degrees Fahrenheit (about 425 degrees Celsius), at least 900 degrees Fahrenheit (about 480 degrees Celsius), or at least 1000 degrees Fahrenheit (about 535 degrees Celsius).

[0087] Embodiment 37. The bimetallic seal or assembly of any one of Embodiments 1-36, wherein the difference between the stress in the first sealing component and the stress in the second sealing component is no more than 100 k psi (about 690 MPa), no more than 90 k psi (about 620 MPa), no more than 80 k psi (about 550 MPa), no more than 70 k psi (about 480 MPa), no more than 60 k psi (about 415 MPa), no more than 50 k psi (about 345 MPa), no more than 25 k psi (about 175 MPa), no more than 20 k psi (about 140 MPa), no more than 15 k psi (about 105 MPa), no more than 10 k psi (about 70 MPa), or no more than 5 k psi (about 35 MPa).

[0088] Embodiment 38. A method of forming a seal, the method comprising: forming a first sealing component; forming a second sealing component; and joining the first sealing component and the second sealing component.

[0089] Embodiment 39. The method of embodiment 38, wherein forming the first sealing component comprises 3D printing the first sealing component.

[0090] Embodiment 40. The method of any one of embodiments 38-39, wherein forming the second sealing component comprises 3D printing the second sealing component.

[0091] Embodiment 41. The method of any one of embodiments 38-40, wherein joining the first sealing component and the second sealing component comprises: ultrasonic welding the first sealing component to the second sealing component; laser sintering the first sealing component to the second sealing component; mechanically crimping the first sealing component to the second sealing component; cold rolling (coulomb bonding) the first sealing component to the second sealing component; brazing the first sealing component to the second sealing component; 3D printing the first sealing component or the second sealing component about the other; or a combination thereof.

[0092] Embodiment 42. The method of any one of embodiments 38-41, wherein the first material is different than the second material.

[0093] Embodiment 43. The method of embodiment 42, wherein a coefficient of thermal expansion (CTE) of the first material of the first sealing component is different than a CTE of the second material of the second sealing component.

[0094] Embodiment 44. The method of embodiment 43, further comprising: installing the bimetallic seal between a first component part and a second component part formed of different metallic materials such that the first sealing component forms a radial seal with the first component part and the second sealing component forms a radial seal with the second component part.

[0095] Embodiment 45. The method of embodiment 44, further comprising: subjecting the bimetallic seal to an operating temperature of at least 500 degrees Fahrenheit (about 260 degrees Celsius), at least 600 degrees Fahrenheit (about 315 degrees Celsius), at least 700 degrees Fahrenheit (about 370 degrees Celsius), at least 800 degrees Fahrenheit (about 425 degrees Celsius), at least 900 degrees Fahrenheit (about 480 degrees Celsius), or at least 1000 degrees Fahrenheit (about 535 degrees Celsius); and maintaining a fluid-tight seal between the first component part and the second component part.

[0096] Embodiment 46. The method of any one of embodiments 38-45, wherein the difference between the stress in the first sealing component and the stress in the second sealing component is no more than 100 kpsi (about 690 MPa), no more than 90 kpsi (about 620 MPa), no more than 80 k psi (about 550 MPa), no more than 70 k psi (about 480 MPa), no more than 60 k psi (about 415 MPa), no more than 50 k psi (about 345 MPa), no more than 25 k psi (about 175 MPa), no more than 20 kpsi (about 140 MPa), no more than 15 k psi (about 105 MPa), no more than 10 k psi (about 70 MPa), or no more than 5 k psi (about 35 MPa).

[0097] This written description uses examples to disclose embodiments, including the best mode, and also to enable any person skilled in the art to make and use the present application. The patentable scope is defined by the claims and can include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements in common with the words recited in the claims or if they do not differ from the recited literal language of the claims by more than insubstantial differences.

[0098] Note that not all of the activities described above in the general description are required, that a portion of a specific activity can not be required, and that one or more further activities can be performed in addition to those described. Still further, the order in which activities are listed are not necessarily the order in which activities are performed.

[0099] In the foregoing specification, concepts have been described with reference to specific embodiments. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present application as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of the present application.

[0100] As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having,” “contains,” “containing,” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of features is not necessarily limited only to those features but can include other features not expressly listed or inherent to such process, method, article, or apparatus. Further, unless expressly stated to the contrary, “or” refers to an inclusive-or and not to an exclusive-or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

[0101] Additionally, “one” or “an” is used to describe one or more than one instance of an element and component. This is only for convenience and to give a general sense of the scope of the application. This description should be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise.

[0102] Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any feature(s) that can cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature of any or all the claims.

[0103] Upon reading this specification, those skilled in the art will appreciate that, for purposes of clarity and avoiding obscuring the disclosure, certain features that are described in the context of separate embodiments can also be provided in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be provided separately or in any suitable sub-combination. Further, references to a value stated in a range include each value within that range.

Claims

1. An annular bimetallic seal comprising: a first seal component formed of a first material; a second seal component formed of a second material different from the first material; and a joint formed between the first seal component and the second seal component, wherein the first seal component includes a first arcuate portion that forms a radial seal with a first assembly component and a first joint feature, and wherein the second seal component includes a second arcuate portion that forms a radial seal with a second assembly component and a second joint feature; wherein the first arcuate portion directly contacts the first assembly component and the second arcuate portion directly contacts the second assembly component, and wherein the first seal component includes a first seal component end and the second seal component includes a second seal component end, and wherein the first seal component end and the second seal component end are oriented in substantially the same axial direction.

2. The annular bimetallic seal of claim 1, wherein at least one of the first seal component and the second seal component includes a straight portion disposed between the arcuate portion and the joint feature.

3. The annular bimetallic seal of claim 1, wherein at least one of the first joint feature and the second joint feature includes a joint cavity, and wherein the other of the first joint feature and the second joint feature includes a joint leg that is received within the joint cavity to form the joint.

4. The annular bimetallic seal of claim 3, wherein the joint leg is straight, wherein the joint leg extends substantially axially or substantially radially, or a combination thereof.

5. The annular bimetallic seal of claim 3, wherein the joint leg includes opposing arcuate convolutions that form a ridge along a circumference of the joint leg.

6. The annular bimetallic seal of claim 1, wherein the first joint feature includes an arcuate joint portion, and wherein the second joint feature includes a complementary arcuate joint portion, and wherein the arcuate joint portion and the complementary arcuate joint portion at least partially overlap.

7. The annular bimetallic seal of claim 1, wherein the bimetallic seal includes a retainer having at least one cavity configured to at least partially receive the first joint feature and the second joint feature.

8. The annular bimetallic seal of claim 1, wherein the first material of the first seal component is a metallic material, and wherein the second material of the second seal component is a metallic material, and wherein the first material is different from the second material.

9. The annular bimetallic seal of claim 8, wherein a coefficient of thermal expansion CTE of the first material of the first seal component is different from a CTE of the second material of the second seal component. ​ 10. The annular bimetallic seal of claim 9, wherein the first material of the first seal component has a CTE that is greater than a CTE of the second material of the second seal component.

11. The annular bimetallic seal of claim 1, wherein the junction is free of a leak path.

12. The annular bimetallic seal of claim 1, further comprising: a support ring or support spring disposed within at least one of the first seal component and the second seal component.

13. The annular bimetallic seal of claim 1, wherein the first seal component is configured to form a radial seal with a first component part defining an inner diameter ID of an annular face, wherein the second seal component is configured to form a radial seal with a second component part defining an outer diameter OD of the annular face, wherein the first component part is formed of a first metallic material, and wherein the second component part is formed of a second metallic material that is different than the first metallic material.

14. The annular bimetallic seal of claim 13, wherein the first material of the first seal component has a CTE that is lower than a CTE of the first metallic material of the first component part and greater than a CTE of the second metallic material of the second component part, and wherein the second material of the second seal component has a CTE that is greater than the CTE of the second metallic material of the second component part and lower than the CTE of the first metallic material of the first component part.

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