High-temperature brazing filler metal preparation method and brazing process for silicon carbide ceramic and composite materials thereof

A technology of silicon carbide ceramics and composite materials, which is applied in the direction of manufacturing tools, welding/cutting media/materials, welding media, etc., can solve problems such as poor machinability, imperfect silicon carbide connection technology, and restrictions on the practical application of silicon carbide. Strong practical value, solve the effect of low temperature

Active Publication Date: 2017-12-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the machinability of silicon carbide ceramics and its composite materials is poor, and it is difficult to directly form composite parts with large size or complex shape, which needs to be realized through material connection, so the connection technology of silicon carbide materials is very important
However, the connection technology of silicon carbide is still not perfect, which limits the practical application of silicon carbide, especially the connection technology of silicon carbide ceramics and its composite structural parts for extreme service environments

Method used

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  • High-temperature brazing filler metal preparation method and brazing process for silicon carbide ceramic and composite materials thereof
  • High-temperature brazing filler metal preparation method and brazing process for silicon carbide ceramic and composite materials thereof
  • High-temperature brazing filler metal preparation method and brazing process for silicon carbide ceramic and composite materials thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Preparation of high temperature composite brazing filler metal

[0035] The preparation method of the high-temperature brazing filler metal used for silicon carbide ceramics and their composite materials in the present embodiment is as follows:

[0036] 1. Mix the proportion of high-purity titanium and high-purity silicon and use non-consumable arc smelting, then cool with the furnace, solidify into a brazing alloy block, turn the block over to continue melting, repeat five times; high-purity titanium and The high-purity silicon is constituted by mass percentage as follows: high-purity titanium 24wt.%, high-purity silicon 76wt.%.

[0037] 2. The brazing alloy block obtained in step 1 is mechanically smashed, and then the smashed alloy is ground into powder with an average particle size of less than 1 mm with a grinder, and then ball milled into a brazing filler metal powder with an average particle size of 10 μm.

[0038] 3. Combine the solder powder obtaine...

Embodiment 2

[0039] Example 2: Preparation of high temperature composite brazing filler metal

[0040] The preparation method of the high-temperature brazing filler metal used for silicon carbide ceramics and their composite materials in the present embodiment is as follows:

[0041] 1. Mix the proportion of high-purity titanium and high-purity silicon and perform vacuum induction melting (the vacuum degree is 10 -2 Below Pa, the smelting temperature is 1700°C, and the holding time is 20min), which is cooled with the furnace and solidified into a solder alloy block; the high-purity titanium and high-purity silicon are composed by mass percentage: high-purity titanium 22wt.%, high-purity silicon 78wt.% .

[0042] 2. The brazing filler metal alloy block obtained in step 1 is mechanically smashed, and then the smashed alloy is ground into powder with an average particle size of less than 1 mm with a grinder, and then ball milled into a brazing filler metal powder with an average particle siz...

Embodiment 3

[0044] Example 3: Preparation of high temperature composite brazing filler metal

[0045] The preparation method of the high-temperature brazing filler metal used for silicon carbide ceramics and their composite materials in the present embodiment is as follows:

[0046] 1. Mix the proportion of high-purity titanium and high-purity silicon and use non-consumable arc smelting, cool with the furnace, solidify into a brazing alloy block, turn the block over to continue smelting, repeat five times; high-purity titanium and The high-purity silicon is constituted by mass percentage as follows: high-purity titanium 20wt.%, high-purity silicon 80wt.%.

[0047] 2. The brazing alloy block obtained in step 1 is mechanically smashed, and then the smashed alloy is ground into powder with an average particle size of less than 1 mm with a grinder, and then ball milled into a brazing filler metal powder with an average particle size of 10 μm.

[0048]3. Mix the brazing filler metal powder ob...

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Abstract

The invention discloses a high-temperature brazing filler metal preparation method and a brazing process for silicon carbide ceramic and composite materials thereof. High-temperature brazing filler metal for the silicon carbide ceramic and the composite materials thereof comprises the following raw materials in proportions: 20-30 wt% of high-purity titanium, and 70-80 wt% of high-purity silicon; and the adding mass of boron carbide or silicon carbide is 0-10 wt% of the total mass of high-purity titanium and high-purity silicon. A silicon carbide brazing joint is prepared by using a vacuum brazing process (the brazing temperature is 1350-1430 DEG C; the insulation time is 5-45 min; and the brazing seam thickness is 10-200 microns). When the welding temperature is 1380 DEG C, the insulation time is 20 min, the brazing seam thickness is 30 microns, and the B4C adding quantity is 5 wt%, the optimal brazing joint is obtained, the maximum room-temperature shearing strength of the joint reaches 114 MPa, and high practical value is achieved.

Description

technical field [0001] The invention relates to a high-temperature brazing filler metal preparation method and a brazing process for silicon carbide ceramics and their composite materials, and belongs to the connection field of silicon carbide ceramics and their composite materials. Background technique [0002] Silicon carbide and its composite materials are the most widely used type of ceramic structural materials in the industry, and are used in aviation, aerospace, automotive, machinery manufacturing and nuclear industries. With the rapid development of science and technology and industrial economy in recent years, the demand for silicon carbide ceramics and their composite structural parts is increasing, which makes the connection research of silicon carbide also in-depth. The wide application of silicon carbide has promoted the development of silicon carbide welding technology. At the same time, the development of silicon carbide welding technology has expanded the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/40B23K1/008B23K1/20
CPCB23K1/008B23K1/20B23K35/22B23K35/40B23K2103/16B23K2103/52
Inventor 钟志宏温群李华鑫王志泉宋奎晶朱志雄
Owner HEFEI UNIV OF TECH
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