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Brazing material for SiC ceramic brazing and brazing method

A brazing material and brazing technology, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of inability to ensure the uniformity of the solder composition, unfavorable overall performance of the joint joint, and complicated solder preparation process, etc. problems, to avoid the hazards of toxic elements, good adhesion and wetting properties, low thermal expansion coefficient

Active Publication Date: 2019-06-14
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent CN201610598776.7 discloses a composite brazing material such as Ni, Cu, Ti, Co, Zr, Si, B, etc. The brazing filler metal has improved wettability to SiC ceramics, and has good bonding performance with SiC ceramics, improving The shear strength is improved, but the residual stress of the joint caused by high brazing temperature is not good for the overall performance of the joint
Lin et al. used Ag-Cu-Ti+W alloy powder to connect Cf / SiC composite materials and Ti alloy. Due to the strengthening effect and stress relief effect of W particles, the joint room temperature and high temperature shear strength were improved, but the solder preparation The process is complicated, the uniformity of the solder composition cannot be guaranteed, and it is not easy to operate

Method used

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Embodiment 1

[0029] This embodiment provides a brazing material for brazing SiC ceramics, including components by weight percentage: Ag60%, Cu 28%, Sn 0.5%, Ni 1%, Ti 2.5%, Mo 4%, B 4% , where Ag, Sn, Ni, Cu, Ti powder particle size is The powder particle size of the remaining components is

[0030] The method for brazing by utilizing the above-mentioned brazing material may further comprise the steps:

[0031] S1. Mix all components uniformly by ball milling in proportion, and add oily adhesive to make a paste material (Handy Flo 300 series from Lukes Company, this series of adhesive burns cleanly and has no residue or only a small amount of residue after welding). In this embodiment, the brazing material accounts for 90% by weight, and the oily adhesive accounts for 10%.

[0032] S2, pre-welding pretreatment stage: the surface of the hot-pressed and sintered SiC ceramic sheet (fired by Shanghai Silicate, and made into a SiC ceramic sheet with a size of 16mmX 4mmX 5mm through an inne...

Embodiment 2

[0036] The present embodiment provides a brazing material for SiCk ceramic brazing, comprising components by weight percentage: Ag62%, Cu30%, Sn 0.5%, Ni 0.5%, Ti 2%, Mo 2%, B3%, wherein Ag, Ni, Sn, Cu, Ti powder particle size is The remaining powder particle size is

[0037] The method for brazing by utilizing the above-mentioned brazing material may further comprise the steps:

[0038] S1. After weighing each component in proportion and mixing them uniformly, use a high-vacuum single-roller stripping machine to make an amorphous foil-like material;

[0039] S2. Pre-welding pretreatment stage: the surface of the hot-pressed and sintered SiC ceramic sheet (fired by Shanghai Silicate, and made into a SiC ceramic sheet with a size of 16mmX 4mmX 5mm by an inner circle slicer) is roughly ground on a mechanical grinder , and then, use a diamond grinding paste polishing machine for grinding and smoothing, and use acetone for ultrasonic cleaning Remove impurities, oil stains a...

Embodiment 3

[0043] Present embodiment provides a kind of brazing material that is used for SiCk ceramic brazing, comprises component by weight percentage: Ag40%, Cu 37%, Sn 0.5%, Ni 3%, Ti 4.5%, Mo 7%, B 8% , where Ag, Sn, Ni, Cu, Ti powder particle size is The remaining powder particle size is

[0044] The method for brazing by utilizing the above-mentioned brazing material may further comprise the steps:

[0045] S1. Mix all components uniformly by ball milling in proportion, and add oily adhesive (Handy Flo300 series from Lukes Company, this series of adhesives burns cleanly and has no residue or only a small amount of residue after welding) to make a paste material. In this embodiment, the brazing material accounts for 90% by weight, and the oily adhesive accounts for 10%.

[0046] S2. Pre-welding pretreatment stage: the surface of the hot-pressed and sintered SiC ceramic sheet (fired by Shanghai Silicate, and made into a SiC ceramic sheet with a size of 16mmX 4mmX 5mm by an inne...

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Abstract

The invention discloses a brazing material for SiC ceramic brazing and a brazing method. The brazing material comprises the following components of, by weight, 40%-63% of Ag, 25%-41% of Cu, 0-2.5% ofSn, 0-5.5% of Ni, 2%-4.5% of Ti, 2%-7% of Mo and 1%-8% of B. The cross-section reaction between the brazing material and ceramic is fully considered, a silver-based brazing material having good wettability to the ceramic material is selected, the contents of Sn and Ni are lowered, the joint strength is improved by adding Mo and B particles, the thermal expansion coefficient of the brazing materialis lowered, the residual stress of a brazed joint is relieved, the joint has good isotropy, and thus the effect that the SiC ceramic joint has good mechanical distribution characteristics can be ensured.

Description

technical field [0001] The invention relates to a brazing filler metal composition used for ceramic connection, in particular to a brazing material used for SiC ceramic brazing and a brazing method using the material. It belongs to the technical field of welding processing. Background technique [0002] SiC ceramic material, due to its good high temperature oxidation resistance, wear resistance, excellent mechanical properties, etc., is considered to be the high temperature structural material with good application prospects. Using this ceramic to make the heat insulation tile on the space shuttle can make When the space shuttle is running at high altitude, it is not affected by extreme high temperature (about 1680°C); bearings made of SiC ceramics are lighter in weight and stronger than ordinary bearings, and do not need to be lubricated with lubricants. However, like most ceramic materials, SiC ceramics are brittle, have low tensile strength, are difficult to deform, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/008B23K35/30
Inventor 蔡淑娟陈宇红柴宏
Owner BEIFANG UNIV OF NATITIES
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