Connection method of silicon carbide ceramics, silicon carbide ceramic connector and silicon carbide ceramics

A technology of silicon carbide ceramics and a connection method, which is applied in the field of aviation materials, can solve the problems of poor connection performance and lack of effective treatment of the parts to be connected, and achieve a good connection effect

Active Publication Date: 2022-04-12
成都成维精密机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing brazing flux connection ceramic-ceramic or ceramic-metal connection performance is poor, and there is no effective treatment of the parts to be connected before connection

Method used

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  • Connection method of silicon carbide ceramics, silicon carbide ceramic connector and silicon carbide ceramics
  • Connection method of silicon carbide ceramics, silicon carbide ceramic connector and silicon carbide ceramics
  • Connection method of silicon carbide ceramics, silicon carbide ceramic connector and silicon carbide ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 32.55kg Si powder, 2.45kg Ti powder, 2kg Zr powder, 12.3kg B powder, 1.1kg Fe powder, 6.5kg Cu ​​powder, 2.5kg Hf powder in an agate mortar and grind them evenly, then place them in a graphite crucible for Sintering, the sintering condition is 1400°C / 2h, after the sintering is completed, place it in a planetary ball mill for fine grinding and sieving, and then the flux product can be obtained.

Embodiment 2

[0026] Mix 36.55kg Si powder, 2.5kg Ti powder, 2.5kg Zr powder, 12.5kg B powder, 1.5kg Fe powder, 8.5kg Cu ​​powder, 1.5kg Hf powder in an agate mortar and grind them evenly, then place them in a graphite crucible for sintering , the sintering condition is 1400°C / 2h, after the sintering is completed, place it in a planetary ball mill for fine grinding and sieving, and then the flux product can be obtained.

Embodiment 3

[0028] Mix 40kg Si powder, 2.7kg Ti powder, 3.5kg Zr powder, 14.2kg B powder, 1.5kg Fe powder, 9.5kg Cu ​​powder, 1.7kg Hf powder in an agate mortar and grind them evenly, then place them in a graphite crucible for Sintering, the sintering condition is 1400°C / 2h, after the sintering is completed, place it in a planetary ball mill for fine grinding and sieving, and then the flux product can be obtained.

[0029] The flux that embodiment 1-3 makes is respectively used in the welding between pottery and pottery, and welding mode is brazing, and welding method comprises the following steps:

[0030] ①Pretreatment: Ceramic-10*10*3mm cut sample, 20*10*3mm stretched sample, polished with a brown brush (sequentially polished with water-based sandpaper with a roughness of 300-2000 mesh, each Grinding with roughness sandpaper for 30min)→silicon carbide coating (that is, coating the surface of the ceramic shear sample with a silicon carbide coating, coating the silicon carbide coating on...

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Abstract

The invention discloses a silicon carbide ceramic connecting method, a silicon carbide ceramic connector and silicon carbide ceramics, welding flux is welded on a welding surface of one silicon carbide ceramic unit and a welding surface of another silicon carbide ceramic unit, and the silicon carbide ceramic connecting method comprises the following steps: (1) pretreatment: polishing to-be-welded parts of two silicon carbide ceramics; then respectively carrying out acetone solution ultrasonic cleaning, alcohol ultrasonic cleaning and deionized water cleaning; (2) preparing soldering flux paste; (3) pasting: brushing the paste-made welding flux to the welding surfaces of the two silicon carbide ceramics; and (4) welding: putting the two silicon carbide ceramics into a clamping tool, and brazing in a heat treatment furnace, wherein the heating rate and the cooling rate are less than or equal to 5 DEG C/min. According to the method, good connection of SiC ceramics is achieved, and under the conditions that the temperature is 1400 DEG C, the heat preservation time is 10 min and the brazing filler metal thickness is two layers, the maximum shear strength of a SiC/welding flux/SiC connector is 150 MPa.

Description

technical field [0001] The invention relates to the field of aviation materials, in particular to a connection method of silicon carbide ceramics, a connection head of silicon carbide ceramics and a silicon carbide ceramics. Background technique [0002] Because of its low density, high strength, high elastic modulus, and high thermal conductivity, silicon carbide ceramics are already very promising materials in the field of structural materials. It is difficult to prepare large-sized and complex-shaped devices in the hot-pressing sintering process that requires higher equipment, which limits its further application. Therefore, realizing the connection between ceramics and ceramics can well make up for this technical problem. At present, the connection processes of silicon carbide ceramics mainly include brazing, diffusion welding, glass solder method, reaction bonding method, cementing method, etc. Compared with other Brazing has more advantages in process practicability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00C04B35/565
Inventor 李涛尧巍华
Owner 成都成维精密机械制造有限公司
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