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Flux for silicon carbide ceramic connection and preparation method thereof

A technology of silicon carbide ceramics and flux, which is applied in the field of aerospace materials, can solve problems such as poor connection performance and achieve good connection effects

Active Publication Date: 2022-04-15
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

Method used

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  • Flux for silicon carbide ceramic connection and preparation method thereof
  • Flux for silicon carbide ceramic connection and preparation method thereof
  • Flux for silicon carbide ceramic connection and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix 32.55kg Si powder, 2.45kg Ti powder, 2kg Zr powder, 12.3kgB 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

[0030] Mix 36.55kg of Si powder, 2.5kg of Ti powder, 2.5kg of Zr powder, 12.5kg of B powder, 1.5kg of Fe powder, 8.5kg of Cu powder, and 1.5kg of Hf powder in an agate mortar and grind them evenly, then place them in a graphite crucible for sintering. The 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

[0032] Mix 40kg Si powder, 2.7kg Ti powder, 3.5kg Zr powder, 14.2kgB 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.

[0033] 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:

[0034] 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 a silicon carbide coating on the surface of the ceramic shear sample, coating the silicon carbide coating on t...

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Abstract

The invention discloses a welding flux for silicon carbide ceramic connection and a preparation method of the welding flux. The welding flux is prepared from, by weight, 30-40 parts of Si powder, 1-3 parts of Ti powder, 1-4 parts of Zr powder, 10-15 parts of B powder, 1-2 parts of Fe powder, 5-10 parts of Cu powder and 1-5 parts of Hf powder. According to the flux, on one hand, oxide, carbide and nitride ceramics are effectively wetted, and on the other hand, the organization structure, strength and fracture morphology of a weld joint are affected.

Description

technical field [0001] The invention relates to the field of aviation materials, in particular to a flux for connecting silicon carbide ceramics and a preparation method thereof. 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 and connection performance, and has been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/36B23K35/40
CPCY02E30/30
Inventor 李涛
Owner 成都成维精密机械制造有限公司
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