Preparation method of multi-core integrated glass sealing electric connector

Abstract

The invention discloses a preparation method of a multi-core integrated glass sealing electric connector, and the method comprises the steps: S1, assembling a sintering die, sequentially assembling a housing, a core column and glass on a first die, and sequentially installing a second die, a pressing die and a positioning die; s2, the assembled sealing piece is sintered, and glass sealing is achieved; s3, after the sintered sealing part is removed from the sintering mold, sand blasting, cleaning and drying treatment are carried out; s4, the sealing part is sequentially installed on a second mold, a pressing mold and a positioning mold and is inversely arranged in a graphite box, and then a ceramic wafer and a brazing solder are sequentially placed; s5, the assembled sealing piece is sintered again, and ceramic brazing sealing is achieved; s6, after the brazed sealing part is removed from the sintering mold again, sand blasting, cleaning and drying treatment are conducted; and S7, carrying out surface electroplating treatment on the shell and the core column. The problems of glass overflow and poor electrical property and pressure resistance in the preparation process of the multi-core integrated glass sealing electric connector are solved, and the electrical property, the pressure resistance and the sealing reliability of the electric connector are improved.

Description

Technical Field

[0001] This invention relates to the field of special electrical connector manufacturing technology, and more specifically to a method for preparing a multi-core integrated glass-sealed electrical connector. Background Technology

[0002] With the development of the electronics industry, electronic components are trending towards miniaturization and precision. Glass-metal seals are widely used in manned aerospace, weaponry, and electronic communications, and their performance requirements are becoming increasingly stringent. Glass, as an excellent insulating material, offers superior electrical performance, pressure resistance, and sealing reliability compared to common plastic seals. However, due to the significant difference in thermal expansion coefficients between the shell and the glass, excessive internal stress generated during cooling can easily lead to glass cracking, reduced sealing performance, and poor insulation resistance. Compared to pure glass sealing, the integrated sealing technology combining glass and ceramic offers superior electrical performance, higher pressure resistance, and enhanced resilience against electrical failures during long-term service.

[0003] The sealing structure of multi-core integrated glass-sealed electrical connectors is characterized by: multiple cores, large glass content, and small distance between the core and the housing. During assembly, the glass surface is higher than the sealing surface. During sintering, the glass easily overflows onto the stepped surface flush with the sealing surface. The reduction in glass content creates cavities within the glass, leading to problems such as glass cracking, poor electrical performance, and low voltage withstand capability. Therefore, it is necessary to develop a manufacturing method for multi-core integrated glass-sealed electrical connectors to solve these technical problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a method for manufacturing a multi-core integrated glass-sealed electrical connector, solving problems such as glass overflow, glass cavity, glass cracking, and poor electrical performance and withstand voltage during sintering.

[0005] The technical solution adopted by this invention to solve the technical problem is: a method for manufacturing a multi-core integrated glass-sealed electrical connector, the specific steps of which are as follows:

[0006] S1. Assemble the sintering mold. On mold one, assemble the shell, core column, and glass in sequence. After completion, install mold two, pressing mold, and positioning mold in sequence.

[0007] S2. Place the assembled sealing components into a chain furnace for sintering to achieve glass sealing;

[0008] S3. After removing the sintered sealing parts from the sintering mold, perform sandblasting, cleaning, and drying.

[0009] S4. Install the sealing components onto mold 2, the pressing mold and the positioning mold in sequence, place them in the graphite box in reverse direction, and then place the ceramic sheet and the brazing solder in sequence.

[0010] S5. The assembled sealing components are placed into the chain furnace for sintering a second time to achieve brazing sealing.

[0011] S6. After removing the brazed sealing component from the sintering mold again, it is subjected to sandblasting, cleaning, and drying to obtain a semi-finished sealing component.

[0012] S7. Perform surface electroplating treatment on the shell and core of the semi-finished sealing component.

[0013] Further, in step S1, the shell is made of 316L stainless steel, 304 stainless steel, 17-4PH stainless steel, TC4 titanium alloy or 4J29 Kovar alloy; the core is made of iron-nickel alloy 4J29, 4J28 or 4J50 alloy; the glass is made of Elan-13#, ST, BH or DM308; and the sintering mold is made of IG70 or IG43.

[0014] Further, in step S1, the sintering mold is a split-structure mold. Mold one has a boss step, and the boss step is provided with several core column positioning holes. A sealing hole is formed in the middle of the inner cavity of the shell, and the glass is placed in the sealing hole. The inner diameter of mold two is the size of the sealing hole to prevent the glass from overflowing to the sealing surface step. The pressing mold is provided with several core column through holes. The outer side of the pressing mold is close to the inner wall of mold two. The lower part of the pressing mold presses the glass, and the top of the pressing mold presses against mold two. The positioning mold is embedded in the pressing mold and is provided with core column positioning blind holes to prevent the core column from tilting.

[0015] Further, in step S1, the glass has several first through holes for the core column to pass through, the diameter of the first through holes being 0.3-0.4 mm larger than the diameter of the core column, the outer diameter of the glass being 0.2-0.3 mm smaller than the diameter of the sealing hole, and the outer diameter of the mold being 0.05-0.1 mm smaller than the diameter of the sealing hole; the mold has several second through holes for the core column to pass through, the diameter of the second through holes being 0.1-0.15 mm larger than the diameter of the core column, and the mass of the mold is 30%-45% of the mass of the sealing glass.

[0016] Furthermore, in step S2, the sintering furnace is a chain sintering furnace protected by a nitrogen atmosphere, with a total of 12 temperature zones, the temperatures of which are 650-690℃, 740-780℃, 850-890℃, 940-980℃, 1010-1040℃, 1010-1040℃, 900-950℃, 810-840℃, 670-715℃, 600-630℃, and 505-545℃; the mesh belt speed is 30-45 mm / min.

[0017] Further, in step S3, the sintered sealing component is sandblasted under a pressure of 0.2 to 0.3 MPa, then ultrasonically cleaned with pure water for 15 to 20 minutes and with anhydrous ethanol for 20 to 30 minutes or more in an ultrasonic cleaner, and then dried in an oven at a temperature of 90°C to 130°C for more than 1.5 hours.

[0018] Furthermore, in step S4, all the chamfers on the back of the ceramic sheet are C0.5 to C1, which facilitates the placement of brazing solder and prevents it from shifting position.

[0019] Furthermore, in step S5, the sintering furnace is a chain sintering furnace protected by a nitrogen atmosphere, with a total of 8 temperature zones, the temperatures of each zone being 560~590℃, 690~730℃, 800~840℃, 800~840℃, 710~750℃, 630~670℃, and 520~550℃ respectively; the mesh belt speed is 30~50mm / min.

[0020] Further, in step S6, the brazed sealing component is sandblasted under a pressure of 0.2 to 0.3 MPa, then ultrasonically cleaned with pure water for 15 to 20 minutes and with anhydrous ethanol for 20 to 30 minutes or more in an ultrasonic cleaner, and then dried in an oven at a temperature of 90°C to 130°C for 1.5 hours or more.

[0021] Furthermore, in step S7, the electroplating process specifically involves first using a nickel base with a nickel layer thickness of 2-5 μm, followed by gold plating with a gold plating thickness greater than 1.5 μm.

[0022] The beneficial effects of this invention are as follows: Compared with the prior art, the method for manufacturing a multi-core integrated glass-sealed electrical connector provided by this invention employs a glass-ceramic assembly sealing technology to seal the connector. The mass of the molding die is calculated and designed based on the corresponding weight ratio of the glass, and the sealing glass is pressed and sintered. This method can solve problems such as glass overflow, glass cavity, glass cracking, and poor electrical performance and pressure resistance during sintering. The manufactured electrical connector has excellent electrical performance and higher pressure resistance, as well as the ability to resist electrical performance failure under long-term service conditions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the glass sealing assembly in this invention.

[0024] Figure 2 This is a schematic diagram of the ceramic brazing assembly in this invention.

[0025] Figure 3 This is a schematic diagram of the distribution of the core pillars in this invention.

[0026] Among them, 1-Mold 1, 2-Shell, 3-Core column, 4-Glass, 5-Mold 2, 6-Pressure mold, 7-Positioning mold, 8-Ceramic sheet, 9-Boss step, 10-Core column positioning hole, 11-Sealing hole, 12-First through hole, 13-Second through hole, 14-Positioning blind hole. Detailed Implementation

[0027] The present invention will be further illustrated below with specific embodiments. However, these examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0028] Example

[0029] like Figures 1 to 3 As shown, an aero-engine electrical connector has a sealing hole diameter of 22mm and a sealing hole length of 18mm. The housing 1 is made of 17-4PH stainless steel, the core 3 is made of 4J50 alloy, the outer diameter of the core 3 is 3.5mm, the inner diameter of the core 3 is 2.5mm, and there are 13 core 3s. The glass 4 uses Elan-13# glass powder with a glass content of 9290mg. The ceramic sheet 8 is made of 80-95% alumina ceramic with a height of 3mm. The metallization of the ceramic sheet 8 is a molybdenum-manganese metal layer. The silver-copper solder ring is AgCu28. The mold material is IG70. The 13 holes of mold 1, the 13 holes of glass 4, the 13 holes of ceramic sheet 8, the 13 holes of pressure mold 6, and the 13 holes of positioning mold 7 are all arranged in the same way.

[0030] The specific steps of the preparation method are as follows:

[0031] S1. Assemble the sintering mold. On mold 1, assemble shell 2, core column 3, and glass 4 in sequence. After completion, install mold 2 5, pressing mold 6, and positioning mold 7 in sequence.

[0032] S2. Place the assembled sealing components into a chain furnace for sintering to achieve glass sealing;

[0033] S3. After removing the sintered sealing parts from the sintering mold, perform sandblasting, cleaning, and drying.

[0034] S4. Install the sealing components onto mold 2 5, pressing mold 6 and positioning mold 7 in sequence, place them in the graphite box in reverse direction, and then place the ceramic sheet 8 and brazing solder in sequence.

[0035] S5. The assembled sealing components are placed into the chain furnace for sintering a second time to achieve brazing sealing.

[0036] S6. After removing the brazed sealing component from the sintering mold again, it is subjected to sandblasting, cleaning, and drying to obtain a semi-finished sealing component.

[0037] S7. Perform surface electroplating treatment on the shell 2 and core 3 of the semi-finished sealing component.

[0038] In step S1, the sintering mold is a split-structure mold. Mold 1 has a boss step 9 and 13 core column positioning holes 10. A sealing hole 11 is formed in the middle of the inner cavity of the shell 2, and the glass 4 is placed in the sealing hole 11. The inner diameter of mold 2 5 is the same as that of the sealing hole 11 to prevent the glass from overflowing to the sealing surface step. In this embodiment, the inner diameter of mold 2 5 is 22mm. The pressing mold 6 has 13 second through holes 13 with a diameter of 3.6mm. The outer side of the pressing mold 6 is close to the inner wall of mold 2 5. The lower part of the pressing mold 6 presses the glass 4, and the top of the pressing mold 6 presses the mold 2 5. The positioning mold 7 is embedded in the pressing mold 6 and has 13 core column positioning blind holes 14 to prevent the core column 3 from tilting.

[0039] In step S1, the outer diameter of the glass 4 is 19.5 mm, and the diameter of the first through hole 12 on the glass 4 is 3.85 mm.

[0040] In step S1, the diameter of the second through hole on the mold 6 is 3.6 mm, and the mass of the mold is 3700 mg.

[0041] In step S2, the sintering furnace is a nitrogen atmosphere protected chain sintering furnace with a total of 12 temperature zones, the temperatures of which are 660℃, 750℃, 850℃, 960℃, 1020℃, 1020℃, 940℃, 830℃, 680℃, 610℃, and 520℃ respectively; the mesh belt speed is 35mm / min.

[0042] In step S3, the sintered sealing component is sandblasted at a pressure of 0.25 MPa, then ultrasonically cleaned with pure water for 20 minutes and with anhydrous ethanol for 25 minutes in an ultrasonic cleaner, and then dried in an oven at 100°C for more than 2 hours.

[0043] In step S4, the chamfer of all the edges on the back of the ceramic sheet 8 is C0.7.

[0044] In step S5, the sintering furnace is a nitrogen atmosphere protected chain sintering furnace with a total of 8 temperature zones, and the temperatures of each zone are 580℃, 710℃, 820℃, 820℃, 820℃, 720℃, 640℃, and 550℃, respectively; the mesh belt speed is 38mm / min.

[0045] In step S6, the brazed sealing component is sandblasted at a pressure of 0.25 MPa, then ultrasonically cleaned with pure water for 20 minutes and anhydrous ethanol for 25 minutes in an ultrasonic cleaner, and then dried in an oven at 100°C for more than 2 hours.

[0046] In step S7, the electroplating process specifically involves first using a nickel base with a nickel layer thickness of 3.5 μm, followed by gold plating with a gold layer thickness of 1.8 μm.

[0047] The manufactured electrical connectors were tested. Under normal environmental conditions, the insulation resistance was greater than 10 GΩ / 1000VDC, the withstand voltage was higher than 1500V / DC, and the leakage rate, as tested by helium mass spectrometry leak detector, was less than 10%. The airtightness performance was ≤10. -9 Pa·m 3 It can withstand 100MPa oil pressure for 10 minutes without leakage or deformation.

[0048] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A method for manufacturing a multi-core integrated glass-sealed electrical connector, characterized in that, The specific steps of the preparation method are as follows: S1. Assemble the sintering mold. On mold one, assemble the shell, core column, and glass in sequence. After completion, install mold two, pressing mold, and positioning mold in sequence. S2. Place the assembled sealing components into a chain furnace for sintering to achieve glass sealing; S3. After removing the sintered sealing parts from the sintering mold, perform sandblasting, cleaning, and drying. S4. Install the sealing components onto mold 2, the pressing mold and the positioning mold in sequence, place them in the graphite box in reverse direction, and then place the ceramic sheet and the brazing solder in sequence. S5. The assembled sealing components are placed into the chain furnace for sintering a second time to achieve brazing sealing. S6. After removing the brazed sealing component from the sintering mold again, it is subjected to sandblasting, cleaning, and drying to obtain a semi-finished sealing component. S7. Perform surface electroplating treatment on the shell and core of the semi-finished sealing component.

2. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S1, the shell is made of 316L stainless steel, 304 stainless steel, 17-4PH stainless steel, TC4 titanium alloy or 4J29 Kovar alloy; the core is made of iron-nickel alloy 4J29, 4J28 or 4J50 alloy; the glass is made of Elan-13#, ST, BH or DM308; and the sintering mold is made of IG70 or IG43.

3. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S1, the sintering mold is a split-structure mold. Mold one has a raised step with several core column positioning holes. A sealing hole is formed in the middle of the inner cavity of the shell, and the glass is placed in the sealing hole. The inner diameter of mold two is the same as the sealing hole size to prevent the glass from overflowing onto the sealing surface step. The pressing mold has several core column through holes. The outer side of the pressing mold is in close contact with the inner wall of mold two. The lower part of the pressing mold presses the glass, and the top of the pressing mold presses against mold two. The positioning mold is embedded in the pressing mold and has blind holes for core column positioning to prevent the core column from tilting.

4. A method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1 or 3, characterized in that: In step S1, the glass has several first through holes through which the core post passes. The diameter of the first through hole is 0.3-0.4 mm larger than the diameter of the core post. The outer diameter of the glass is 0.2-0.3 mm smaller than the diameter of the sealing hole. The outer diameter of the mold is 0.05-0.1 mm smaller than the diameter of the sealing hole. The mold has several second through holes through which the core post passes. The diameter of the second through hole is 0.1-0.15 mm larger than the diameter of the core post. The mass of the mold is 30%-45% of the mass of the sealing glass.

5. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S2, the sintering furnace is a chain sintering furnace protected by a nitrogen atmosphere, with a total of 12 temperature zones. The temperatures of each zone are 650-690℃, 740-780℃, 850-890℃, 940-980℃, 1010-1040℃, 1010-1040℃, 900-950℃, 810-840℃, 670-715℃, 600-630℃, and 505-545℃, respectively; the mesh belt speed is 30-45 mm / min.

6. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S3, the sintered sealing component is sandblasted under a pressure of 0.2-0.3 MPa, then ultrasonically cleaned with pure water for 15-20 minutes and with anhydrous ethanol for 20-30 minutes or more in an ultrasonic cleaner, and then dried in an oven at a temperature of 90℃-130℃ for more than 1.5 hours.

7. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S4, the chamfers of all the edges on the back of the ceramic sheet are C0.5 to C1.

8. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S5, the sintering furnace is a chain sintering furnace protected by a nitrogen atmosphere, with a total of 8 temperature zones, the temperatures of each zone being 560~590℃, 690~730℃, 800~840℃, 800~840℃, 710~750℃, 630~670℃, and 520~550℃ respectively; the mesh belt speed is 30~50mm / min.

9. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S6, the brazed sealing component is sandblasted under a pressure of 0.2-0.3 MPa, then ultrasonically cleaned with pure water for 15-20 minutes and with anhydrous ethanol for 20-30 minutes or more in an ultrasonic cleaner, and then dried in an oven at a temperature of 90℃-130℃ for more than 1.5 hours.

10. The method for manufacturing a multi-core integrated glass-sealed electrical connector as described in claim 1, characterized in that: In step S7, the electroplating process specifically involves first using a nickel base with a nickel layer thickness of 2-5 μm, followed by gold plating with a gold plating thickness greater than 1.5 μm.

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