Molybdenum mesh and firing method

Abstract

A molybdenum mesh is capable of bending at room temperature even after recrystallization.

Description

Technical Field

[0001] The present disclosure relates to a molybdenum mesh. This application claims priority based on Japanese patent application No. 2023-014227 and No. 2023-014228 filed on February 1, 2023. All the contents described in the Japanese patent application are incorporated herein by reference. Background Art

[0002] Conventionally, molybdenum mesh is described in, for example, Japanese Patent Application Laid-Open No. 4-210834 (Patent Document 1) and Japanese Patent Application Laid-Open No. 63-243249 (Patent Document 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-210834

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 63-243249 Summary of the invention

[0007] The molybdenum mesh disclosed in the present invention is a molybdenum mesh that can be bent at room temperature even after recrystallization.

[0008] The molybdenum mesh disclosed in the present invention is a molybdenum mesh that will not be damaged by impact at room temperature even after recrystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] [ Figure 1 ] Figure 1 It is a plan view of the mesh structure 10 constituting the molybdenum mesh 1 according to the first embodiment.

[0010] [ Figure 2 ] Figure 2 It is enlarged to show Figure 1 : This is a plan view of the portion enclosed by II.

[0011] [ Figure 3 ] Figure 3 It is along Figure 2 Cross-sectional view along line III-III in FIG.

[0012] [ Figure 4 ] Figure 4 It is a plan view of a mesh structure 10 including a folded molybdenum mesh 1 according to the second embodiment.

[0013] [ Figure 5 ] Figure 5 This is a diagram for explaining a method for manufacturing the molybdenum mesh 1 according to the second embodiment.

[0014] [ Figure 6 ] Figure 6 This is a diagram for explaining a method for manufacturing the molybdenum mesh 1 according to the second embodiment.

[0015] [ Figure 7 ] Figure 7 This is a diagram showing a molybdenum mesh 1 having an end portion 13 without a cut surface according to a third embodiment.

[0016] [ Figure 8 ] Figure 8 The photographs show the cross-sectional structures of a pure molybdenum wire and a molybdenum wire doped with La oxide before and after heat treatment.

[0017] [ Fig. 9 ] Fig. 9 1 is a diagram showing a method for measuring the bending characteristics of the molybdenum mesh 1 at room temperature.

[0018] [ Fig.10 ] Fig.10 It is a figure which shows the method for implementing the impact test of the molybdenum mesh 1 at room temperature. DETAILED DESCRIPTION

[0019] [Problems to be Solved by the Present Disclosure]

[0020] In the conventional molybdenum mesh, there is a problem that it is easy to break.

[0021] [Description of Embodiments of the Present Disclosure]

[0022] First, embodiments of the present disclosure will be listed and described.

[0023] Conventionally, when a molybdenum mesh is used for firing, the molybdenum mesh exposed to high temperatures during use becomes significantly brittle and is easily broken during handling at room temperature.

[0024] Due to its crystal morphology, the recrystallized molybdenum mesh is easily deformed by grain boundary sliding at high temperatures, and the grain boundary strength is reduced at room temperature. Therefore, it has the characteristic of being easily broken due to recrystallization embrittlement when a bending load is applied.

[0025] Due to its crystal morphology, the recrystallized molybdenum mesh is easily deformed by grain boundary sliding at high temperatures, and the grain boundary strength is reduced at room temperature. Therefore, it has the characteristic of being easily broken due to recrystallization embrittlement when an impact load is applied.

[0026] The molybdenum mesh exposed to high temperatures where recrystallization may occur during use becomes significantly brittle and has the problem of being easily broken during handling at room temperature.

[0027] In addition, there are problems such as deformation of the net during use and transfer of the shape to the fired product, shortening the life of the net and deteriorating production efficiency, which are technical problems.

[0028] The molybdenum mesh disclosed in the present invention is a molybdenum mesh that can be bent at room temperature even after recrystallization.

[0029] The molybdenum mesh disclosed in the present invention is a molybdenum mesh that will not break even in an impact test at room temperature after recrystallization.

[0030] The deformation amount during the creep test at 900° C. is 5 mm or less. In the molybdenum mesh having such a configuration, the deformation amount (warpage) after the creep test can be made 5 mm or less, so that the deformation of the molybdenum mesh during use can be suppressed.

[0031] Preferably, a fold having a thickness of 100 to 300% of the thickness of the molybdenum mesh is provided at the end of the molybdenum mesh. In the molybdenum mesh thus constructed, the strength can be increased because the thickness at the end is increased.

[0032] Preferably, by performing recrystallization heat treatment, the deformation during recrystallization is 1 mm or less.

[0033] Preferably, the molybdenum mesh contains 0.05 mass % to 2.00 mass % of La oxide and inevitable impurities, with the balance being Mo. In the molybdenum mesh thus constituted, the crystal grains grow due to the action of La oxide, and the desired characteristics are easily exhibited.

[0034] Preferably, the molybdenum mesh for sintering comprises any one of the molybdenum meshes mentioned above.

[0035] Preferably, the sintering method uses the above-mentioned molybdenum mesh for sintering.

[0036] (Implementation Method 1)

[0037] Figure 1 1 is a plan view of the mesh structure 10 constituting the molybdenum mesh 1 according to Embodiment 1. Figure 1 As shown, the molybdenum mesh 1 as a backing plate includes a mesh structure 10 containing molybdenum.

[0038] The mesh structure 10 is composed of molybdenum or molybdenum alloy wires.

[0039] The mesh structure 10 is formed by weaving or braiding the wires 11 and 12. The end faces of the wires 11 and 12 are cut faces 11e and 12e. The cut faces 11e and 12e are formed by cutting the wires 11 and 12.

[0040] Figure 2 It is enlarged to show Figure 1 The plan view of the part enclosed by II in . Figure 2 As shown, the mesh structure 10 is formed by crossing wires 11 and 12. The wires 11 extending in the longitudinal direction and the wires 12 extending in the transverse direction cross each other, thereby forming a plurality of meshes 19.

[0041] In this embodiment, the wires 11 and 12 extend to be perpendicular to each other. However, the wires 11 and 12 may extend to form an acute angle with each other.

[0042] Figure 3 It is along Figure 2 The cross-sectional view of line III-III in FIG. Figure 3 As shown, the cross section of the wire 11 is circular. The cross section of the wire 11 may also be square. Similarly, the cross section of the wire 12 may also be circular or square.

[0043] The wire diameter of the wires 11 and 12 used for the molybdenum mesh 1 is preferably 0.1 mm or more and 1.0 mm or less. By setting it within this range, the molybdenum mesh 1 is difficult to deform at high temperatures and easy to process. When it is less than 0.1 mm, the strength of the wires 11 and 12 may be insufficient in the firing application. Even if it exceeds 1.0 mm, there is no problem, but the wires 11 and 12 are not flexible and difficult to weave.

[0044] The molybdenum mesh 1 is cut into desired sizes by shearing or slitting. The shearing process makes the cut surface sharp, and the brittle molybdenum is easily broken or falls off. However, by bending part or all of the molybdenum, the damage caused by the reduction of strength and the jamming during the process can be prevented.

[0045] The bent portion can eliminate the height difference by pressing and increase the loading area of ​​the sintered material. Alternatively, by making the thickness within 3 times the mesh thickness, it can function as a spacer when overlapping.

[0046] The wires 11 and 12 may contain 2.00 mass % or less of La oxide. Pure molybdenum that has become brittle due to recrystallization lacks ductility when treated at room temperature and may be broken due to stress during treatment.

[0047] The wires 11 and 12 may contain 2.00 mass % or less of La oxide. Pure molybdenum that has become brittle due to recrystallization has poor impact resistance when treated at room temperature and may be broken due to stress during treatment.

[0048] By adding La oxide, the grain boundary strength can be improved and the breakage can be prevented. It should be noted that the composition analysis was performed by inductively coupled plasma (ICP) emission spectroscopy.

[0049] In the temperature range of 1500 to 2600° C., deformation increases, so it is preferable to perform recrystallization treatment. Recrystallization treatment is preferably performed after processing the molybdenum mesh 1. By removing the processing strain of the mesh, deformation resistance can be improved.

[0050] When the molybdenum mesh 1 is deformed, the shape may be transferred to the sintered material. Through the present disclosure, it is also expected that the quality and yield of the sintered material will be improved.

[0051] The material of the mesh structure 10 is pure molybdenum or a molybdenum alloy. The pure molybdenum material used for the mesh structure 10 is preferably a molybdenum material with a general purity of 98.5% by mass or more. The molybdenum alloy may contain a metal additive of more than 0 and less than 1.0% by mass. As an additive, La oxide is preferred. The composition of the added material is determined by inductively coupled plasma (ICP) emission spectroscopy. ICP emission spectroscopy uses ICPS-8100 (Shimadzu Corporation).

[0052] The mesh structure 10 contains inevitable impurities (e.g., Al, Ca, Fe, Mg, Si). The inevitable impurities are determined in accordance with Item 7.4 (Inductively Coupled Plasma (ICP) Emission Spectrometry: Determination of Fe) of (JIS H 1404 2001), the non-volatile component quantitative method (JIS H 1404 2001), etc. The ICP method uses ICPS-8100 (Shimadzu Corporation).

[0053] The shape of the mesh structure 10 may be other than a quadrilateral. The molybdenum mesh 1 may be woven by any weaving method.

[0054] (Implementation Method 2)

[0055] Figure 4 It is a plan view of a mesh structure 10 having a folded molybdenum mesh 1 according to Embodiment 2. The mesh structure 10 according to Embodiment 2 has folded portions 21 and 22 at the ends 13, 14, 15, and 16 thereof.

[0056] The end faces of the wires 11 and 12 are cut faces 11 e and 12 e. The cut faces 11 e and 12 e are formed by cutting the wires 11 and 12. Figure 1 The mesh structure 10 shown is formed by bending the sides of the molybdenum mesh 1 of octagonal molybdenum alloy wires obtained by removing the corners of the quadrilateral. Therefore, the bent parts do not overlap at the corners. It should be noted that this structure is not necessarily required, and the mesh structure 10 can also be formed by bending the sides of the mesh of quadrilateral molybdenum alloy wires. In this case, a structure in which four layers of mesh overlap is formed at the corners of the mesh structure 10.

[0057] Figure 5 This is a diagram for explaining a method for manufacturing the molybdenum mesh 1 according to the second embodiment. Figure 6 This is a diagram for explaining a method for manufacturing the molybdenum mesh 1 according to the second embodiment.

[0058] like Figure 5As shown in FIG. 1 , to manufacture the molybdenum mesh 1, first, the end 13 of the mesh structure 10 is bent as indicated by arrow 101. In this embodiment, the end 13 is bent upward, but the end 13 may be bent downward.

[0059] like Figure 6 As shown, the folded portion 21 is formed by pressing the vicinity of the end portion 13 in the direction indicated by the arrow 102. The thickness of the folded portion 21 is reduced by pressing.

[0060] Figure 7 1 is a diagram showing a molybdenum mesh 1 having an end portion 13 without a cut surface according to Embodiment 3. Figure 7 As shown, there is also a molybdenum mesh 1 having an end 13 without a cut surface. In this case, the wire 12 is woven at the end 13, and the molybdenum mesh 1 can be formed without cutting the wire 12. The end 13 without a cut surface does not need to be folded as long as the strength is sufficient.

[0061] The thickness of the mesh structure 10 was measured using a digital micrometer with a flat measuring surface of the anvil and the spindle of the measuring unit and a spindle diameter D of 6 mm. Alternatively, the thickness may be measured using a vernier caliper.

[0062] When the number of sides of the folded portion is 1 or more, the average value of the thickness of the sides of the folded portion is used as the thickness of the folded side. The thickness is measured at the center of the mesh structure 10 and is used as the thickness of the molybdenum mesh 1. The thickness of the folded portion is preferably 100% or more and 300% or less of the thickness of the molybdenum mesh 1.

[0063] (Example)

[0064] Hereinafter, the present disclosure will be described based on examples.

[0065] (1) Manufacturing of molybdenum mesh

[0066] (1-1) Manufacturing of molybdenum wire

[0067] Metal powders having compositions of materials shown in Tables 1 and 2 with various molybdenum and La oxide compositions were prepared. The metal powders contained Fe of 0.01 mass % or less and non-volatile components of 0.02 mass % or less.

[0068] [Table 1]

[0069]

[0070] [Table 2]

[0071]

[0072] Sample Nos. 1 to 14 in Table 1 have the same compositions as Sample Nos. 1a to 14a in Table 2. The difference lies in the presence or absence of a recrystallization heat treatment in the subsequent step.

[0073] These were pressed and sintered by a molybdenum wire processing method to form an ingot. The obtained ingot was subjected to groove roll rolling or swaging, and then wire drawing to obtain molybdenum wires of sample numbers 1 to 14 and 1a to 14a having diameters shown in the "wire diameter" column of Tables 1 and 2. The molybdenum wires were subjected to electrolytic grinding, annealing, and final finishing.

[0074] (1-2) Weaving and cutting process

[0075] Using molybdenum wires of sample numbers 1 to 14 and 1a to 14a, longitudinal wires were stretched on a loom with a width of 1100 mm. The transverse wires were crossed at right angles to the longitudinal wires and hammered in with a reed to weave a web, and a roll with a length of 35 m was produced. The roll was cut with a shearing machine or a slitting machine into pieces with a width of 220 mm and a length of 180 mm.

[0076] (1-3) Bending process

[0077] For the sample numbers 4, 11 to 14, 4a, and 11a to 14a, the ends of two or four sides were bent by 5 mm to 20 mm using a press brake.

[0078] After bending, press within 3 times the thickness of the mesh. Figure 1 or Figure 4 The molybdenum mesh 1 is shown.

[0079] (1-4) Recrystallization heat treatment

[0080] The recrystallization treatment was performed by heating the sample in a vacuum atmosphere at the temperature of the "recrystallization heat treatment" shown in Table 2. Specifically, the temperature was raised to the temperature of the recrystallization heat treatment in Table 2 at a heating rate of 10°C / min. The recrystallization heat treatment time in Table 2 was maintained, and the temperature was lowered to room temperature at a cooling rate of 20°C / min.

[0081] The recrystallization heat treatment was not performed on the samples in Table 1. Although a jig is sometimes used to increase the processing volume, it is preferable to use a jig made of the same material as the molybdenum mesh 1 to avoid reaction at the contact portion between the molybdenum mesh 1 and the jig.

[0082] That is, the molybdenum mesh 1 is heated at a temperature above 1200°C at which recrystallization begins, so that the crystal particles are elongated in the length direction of the wire. The recrystallization heat treatment temperature is more preferably above 1500°C and below 2000°C. When the treatment is performed below the recrystallization temperature, a sufficient effect may not be obtained. Even if it exceeds 2000°C, there is no problem, but it may cause an increase in cost and a reaction at the contact portion. The time for the recrystallization heat treatment is the time required for the molybdenum constituting the molybdenum mesh 1 to fully recrystallize. However, a recrystallization heat treatment time longer than necessary will result in poor economic efficiency.

[0083] In addition, the sintering furnace can be in a reducing gas atmosphere such as hydrogen or an inert gas atmosphere in addition to a vacuum atmosphere. The "temperature (°C)" in the "heat treatment" column in Tables 1 and 2 refers to the maximum temperature during the heat treatment, and the "time (H)" refers to the time for maintaining the maximum temperature.

[0084] The molybdenum mesh 1 after recrystallization heat treatment is unwound, embedded in resin, and then polished to approximately 1 / 2 of the unwound line to form a mirror surface state, and then crystallization is observed using an appropriate etching solution such as Murakami's reagent.

[0085] In the crystallization observation, a digital microscope VHX-1000 manufactured by KEYENCE was used, and it was confirmed at a magnification of about 50 to 400 times depending on the wire diameter and other conditions that the heat-treated structure changed from a fibrous structure after plastic processing to a recrystallized structure. The "fibrous" in Tables 1 and 2 indicates the structure after plastic processing (wire drawing). "Coarse" or "grown" indicates the structure after recrystallization. "Coarse" refers to isotropic crystal growth, and "grown" refers to anisotropic crystal growth ( Figure 8 ).

[0086] Figure 8 The photographs show the cross-sectional structures of a pure molybdenum wire and a molybdenum wire doped with La oxide before and after heat treatment. Figure 8 The structures before and after heat treatment are shown. Figure 8 It can be seen that the tissue is coarsening or growing.

[0087] By performing recrystallization heat treatment, the fibrous structure that appears after plastic working of pure molybdenum is coarsened.

[0088] After recrystallization, the composition of the molybdenum mesh 1 was checked, and it was confirmed that the composition of the raw material was maintained. Further, the wire diameters of the molybdenum mesh 1 were checked, and it was confirmed that the "wire diameter" in Table 2 was maintained.

[0089] In Tables 1 and 2, "Fold (side)" refers to the number of folded sides in the molybdenum mesh 1, and "Fold (number of times)" refers to the number of folds of the folded sides.

[0090] (2) Evaluation of molybdenum mesh

[0091] The molybdenum mesh was evaluated by a bending test, an impact test, and a creep test. Tables 3 and 4 show the evaluation results of the molybdenum mesh 1 prepared in Tables 1 and 2 after undergoing recrystallization heat treatment (Table 4) and without undergoing recrystallization heat treatment (Table 3), respectively.

[0092] [Table 3]

[0093]

[0094] [Table 4]

[0095]

[0096] (2-1) Evaluation 1: Bending test

[0097] Fig. 9 : is a figure which shows the method for measuring the bending property at room temperature of the molybdenum mesh 1. The bending test of the molybdenum mesh 1 was implemented. The test was performed on the molybdenum mesh 1 (sample number 12a) and the molybdenum mesh 1 of pure molybdenum (sample number 4a) for comparison.

[0098] The evaluation used a wire diameter of 0.35 mm and a #24 mesh, and the ends were bent 5 mm on four sides. #24 mesh means that there are 24 wires in a width of 1 inch (25.4 mm). The mesh of the molybdenum mesh 1 is preferably #4 to 50 mesh.

[0099] The folded parts 21 and 22 are pressed to 115% of the thickness of the unbent part. The size of the molybdenum mesh 1 is a square with a width L of 50 mm and a length B of 50 mm. The two ends of the molybdenum mesh 1 are supported by pedestals 115 and 116 at 10 mm, and a round rod 112 of φ5 is placed horizontally in the center. The distance between the pedestals 115 and 116 is 30 mm.

[0100] The round rod 112 is connected to the tensiometer 110 via a wire 113. A concentrated load is applied to the molybdenum mesh 1 at room temperature by pulling the tensiometer 110 downward as indicated by arrow 111. The load is gradually increased, and the maximum load when the mesh breaks or plastically deforms is measured by the tensiometer to confirm whether there is a break.

[0101] The measurements were performed in the longitudinal and transverse directions, and the average values ​​were used for evaluation. Pure molybdenum tended to break when the load increased to 2.2 kgf (2.2 × 9.8 N). On the other hand, the mesh containing La oxide did not break even when a load of 6 kgf was applied, and the plastic deformation was 90°.

[0102] The same test was conducted on other sample numbers. The results showed that the molybdenum meshes of sample numbers 5a to 14a did not break even when a load of 6 kgf was applied, and the plastic deformation was 90°.

[0103] The same test was performed on other sample numbers. The results are shown in the "bending test" column in Tables 3 and 4.

[0104] Evaluation "A" in the "Bending Test" column means that the molybdenum mesh 1 was not broken at any position even when a load of 6 kgf was applied. "B" means that the molybdenum mesh 1 was broken at any position when a load less than 6 kgf was applied.

[0105] According to this test, it is believed that sample numbers 5 to 14 (5a to 14a) are molybdenum meshes 1 that can be bent at room temperature even after recrystallization. Note that sample numbers 1 to 14 (Table 3) in Table 1 that were not subjected to recrystallization heat treatment did not break.

[0106] (2-2) Evaluation 2: Impact test

[0107] A destructive test (impact resistance test) was performed on the molybdenum mesh 1. The test was performed on the molybdenum mesh 1 (sample number 5a) and a molybdenum mesh 1 made of pure molybdenum (sample number 1a) as a comparison.

[0108] Fig.10 : is a diagram showing a method for implementing an impact test of a molybdenum mesh 1 at room temperature. The evaluation uses a wire diameter of 0.35 mm and a mesh size of #24. The size of the molybdenum mesh 1 is a square with a width L of 100 mm and a length B of 100 mm. The molybdenum mesh 1 is placed on a frame with a width of 50 mm and a length of 50 mm. Thus, a Fig.10 Hole 130 is shown by the dotted line. Hole 130 is an area where no frame exists. A molybdenum mesh 1 exists on hole 130 to cover hole 130. The dimensions of hole 130 are 50 mm in width and 50 mm in length. The inside of hole 130 is not supported by the frame. Therefore, when force is applied to hole 130 from above, the molybdenum mesh 1 constituting hole 130 is deformed. In contrast, since the outside of hole 130 is in direct contact with the frame, the molybdenum mesh 1 will not be deformed even if force is applied to the outside of the hole from above.

[0109] At room temperature, a cylindrical weight 131 weighing 130 grams is freely dropped from a height of 100 mm onto a hole 130 located in the center of the molybdenum mesh 1 .

[0110] The test was repeated 5 times. In the case of pure molybdenum, the molybdenum mesh 1 was damaged and broken due to the impact load. The molybdenum mesh 1 containing La oxide was only deformed and not damaged.

[0111] The same test was performed on other sample numbers. The results are shown in the "Impact Test" column of Tables 3 and 4.

[0112] The samples in Table 3 that were not subjected to recrystallization heat treatment only deformed without being damaged.

[0113] "A" means that the molybdenum mesh 1 did not break even after repeating the test 5 times. "B" means that the molybdenum mesh 1 broke more than once in the 5 tests. Based on this test, it can be considered that sample numbers 5a to 14a are molybdenum meshes 1 that will not break in the impact test at room temperature after recrystallization.

[0114] (2-3) Evaluation 3: Creep test

[0115] A creep test of molybdenum mesh 1 was performed. Molybdenum mesh 1 (sample number 5) and molybdenum mesh 1 (sample number 1) of pure molybdenum were prepared for comparison. A wire diameter of 0.35 mm and a mesh size of #24 were used in the evaluation, and the size of the molybdenum mesh 1 was a rectangle with a width of 50 mm and a length of 100 mm. The two ends of the molybdenum mesh 1 were supported by 10 mm, and a cylindrical weight of 131 grams was placed in the center. A sintering furnace was used, and the treatment was repeated 3 times by heating to 900°C in a hydrogen atmosphere. With the weight placed, the central height of the span was measured using a digital vernier caliper, and the difference before and after the heat treatment was taken as the deformation. In the molybdenum mesh 1 of pure molybdenum, a deformation of 6.8 mm was observed, but the molybdenum mesh 1 containing La oxide was able to suppress the deformation to 3.8 mm.

[0116] The same test was carried out on other sample numbers. The results are shown in the "creep deformation amount" column in Tables 1 and 2.

[0117] In the samples Nos. 1a to 4a containing no La oxide, the creep deformation was large, but in the sample No. 4a, the creep deformation was small due to the folding effect.

[0118] Compared with the sample numbers 1a-14a which have been subjected to the recrystallization heat treatment, the sample numbers 1-14 which have not been subjected to the recrystallization heat treatment have a large creep deformation. However, in the sample numbers 5-14 and 5a-14a, the creep deformation is small due to the effect of the additive. In the sample numbers 4, 11-14, 4a, and 11a-14a, the creep deformation is small due to the effect of folding. The recrystallization heat treatment temperature is 1800°C. By reducing the creep deformation, a molybdenum mesh 1 which can withstand long-term use can be provided.

[0119] (Note 1)

[0120] Molybdenum mesh that can be bent at room temperature even after recrystallization. Molybdenum mesh that will not break in an impact test at room temperature even after recrystallization.

[0121] (Note 2)

[0122] The molybdenum mesh according to Supplementary Note 1, comprising 0.05 mass % to 2.00 mass % of La oxide and inevitable impurities, with the balance being molybdenum.

[0123] (Note 3)

[0124] The molybdenum mesh according to Supplement 1 or 2, wherein a fold having a thickness of 100 to 300% of the thickness of the molybdenum mesh is provided at an end portion of the molybdenum mesh.

[0125] (Note 4)

[0126] The molybdenum mesh according to any one of Supplementary Notes 1 to 3, wherein the deformation amount in a creep test at 900° C. is 5 mm or less.

[0127] (Note 5)

[0128] The molybdenum mesh according to any one of Supplementary Notes 1 to 4, wherein the deformation amount in a creep test at 900° C. is 1 mm or less due to the recrystallization heat treatment.

[0129] (Note 6)

[0130] The molybdenum mesh for sintering as described in any one of Notes 1 to 5.

[0131] (Note 7)

[0132] A sintering method using the molybdenum mesh for sintering described in Appendix 6.

[0133] (Note 8)

[0134] A molybdenum mesh contains 0.05 mass % or more and 2.00 mass % or less of La oxide and inevitable impurities, with the balance being molybdenum.

[0135] (Note 9)

[0136] The molybdenum mesh according to Supplementary Note 8, wherein a fold having a thickness of 100 to 300% of the thickness of the molybdenum mesh is provided at an end portion of the molybdenum mesh.

[0137] The embodiments and examples disclosed herein are illustrative in all aspects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0138] Explanation of symbols

[0139] 1 molybdenum mesh, 10 mesh structure, 11, 12 wires, 11e, 12e cut surfaces, 13, 14, 15, 16 ends, 19 meshes, 21, 22 folding portions, 101, 102, 111 arrows, 110 tensiometers, 112 front ends, 115, 116 pedestals, 130 holes, 131 weights.

Claims

1. A molybdenum mesh can be bent at room temperature even after recrystallization, or it will not be damaged even after recrystallization in the impact test at room temperature.

2. The molybdenum mesh according to claim 1, wherein: It contains 0.05% by mass or more and 2.00% by mass or less of La oxide and inevitable impurities, and the balance is composed of molybdenum.

3. The molybdenum mesh of claim 1 or 2, wherein A fold of 100 to 300% of the thickness of the molybdenum mesh is provided at the end of the molybdenum mesh.

4. The molybdenum mesh of claim 1 or 2, wherein The deformation amount when the creep test was performed at 900°C was 5 mm or less.

5. The molybdenum mesh of claim 1 or 2, wherein By performing recrystallization heat treatment, the deformation amount during the creep test at 900°C is 1 mm or less.

6. The molybdenum mesh for sintering according to claim 1 or 2.

7. A firing method, using the molybdenum mesh for firing according to claim 6.

8. A molybdenum mesh containing 0.05% by mass or more and 2.00% by mass or less of La oxide and inevitable impurities, and the balance consists of molybdenum.

9. The molybdenum mesh according to claim 8, wherein: A fold of 100 to 300% of the thickness of the molybdenum mesh is provided at the end of the molybdenum mesh.

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