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Method for low-temperature connection of aluminum oxide ceramics through phosphate glass brazing filler

A technology of alumina ceramic and phosphate glass, applied in the field of alumina ceramic low temperature connection, can solve the problem of high welding temperature, achieve the effect of simple process, reduced residual internal stress and small residual stress

Inactive Publication Date: 2016-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high welding temperature for the existing brazing connection of alumina ceramics, and to provide a method for low-temperature connection of alumina ceramics with phosphate glass solder

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  • Method for low-temperature connection of aluminum oxide ceramics through phosphate glass brazing filler

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specific Embodiment approach 1

[0018] Specific embodiment one: the method for low-temperature connection of alumina ceramics with phosphate glass solder in this embodiment is implemented in the following steps:

[0019] 1. Put P 2 o 5 Powder, SnO powder, MgO or CaO powder are mixed evenly, and the uniformly mixed powder is placed in a crucible, and then the crucible is placed in a muffle furnace, heated to 1100-1300°C, heat preservation treatment to obtain molten glass, and then Water quenching to obtain glass particles, and ball milling to obtain lead-free phosphate glass powder;

[0020] 2. Mix the lead-free phosphate glass powder with the binder, and then stir evenly to obtain the glass solder paste;

[0021] 3. Use a diamond sand disc to mechanically grind the surface of the alumina ceramics to be welded, and then use acetone and absolute ethanol to ultrasonically clean them in turn to obtain the cleaned alumina ceramics;

[0022] 4. Coating glass solder paste on the surface to be welded of the clean...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 35 to 40 parts of P 2 o 5 Powder, 40-45 parts of SnO powder and 15-25 parts of MgO powder are mixed evenly. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, 35 to 40 parts of P 2 o 5 Powder, 35-45 parts of SnO powder and 10-20 parts of CaO powder are mixed evenly. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for low-temperature connection of aluminum oxide ceramics, in particular to a method for low-temperature connection of aluminum oxide ceramics through phosphate glass brazing filler and aims to solve the problem of higher welding temperature for existing brazing connection of the aluminum oxide ceramics. The connection method comprises steps as follows: 1, P2O5 powder, SnO powder and MgO or CaO powder are uniformly mixed, heated to be melted and subjected to water quenching and ball milling, and lead-free phosphate glass powder is obtained; 2, the lead-free phosphate glass powder is mixed with an adhesive, and glass soldering paste is obtained; 3, to-be-welded surfaces of the aluminum oxide ceramics are polished and washed; 4, the glass soldering paste is applied through silk-screen printing; 5, to-be-welded connecting parts are assembled; 6, the connecting parts are put in a muffle furnace, heated and subjected to heat insulation, and low-temperature connection of the aluminum oxide ceramics is completed. The aluminum oxide ceramics are connected at the low temperature ranging from 280 DEG C to 450 DEG C, the matching property of the thermal expansion coefficients of the aluminum oxide ceramics is good, and the shearing strength of a joint can reach 30-60 MPa.

Description

technical field [0001] The invention relates to a method for connecting alumina ceramics at low temperature. Background technique [0002] Alumina ceramic is a ceramic material mainly composed of alumina. Because of its excellent properties such as good conductivity, mechanical strength and high temperature resistance, it is widely used in machinery, electronics, chemical industry, medicine, aerospace, etc. industry. At present, the methods of connecting alumina ceramics mainly include diffusion welding and brazing, among which brazing method is the most studied and most widely used connection method. [0003] The traditional method of brazing and connecting alumina ceramics is to use metal active solder to realize the connection of alumina. However, due to the high welding temperature, the deformation of alumina is large, which leads to large residual internal stress in the brazed joint, which is not conducive to Obtaining reliable joints. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00C03C8/24
CPCC03C8/24C04B37/003C04B2237/10C04B2237/343C04B2237/52C04B2237/595
Inventor 何鹏林铁松郭伟于芳
Owner HARBIN INST OF TECH
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