Method using selective laser sintering process to produce silicon carbide ceramic part

A technology of laser selective sintering and silicon carbide ceramics, applied in the field of rapid prototyping, can solve the problems of difficult control of sintering shrinkage and deformation, limited practical application and technical promotion, difficult to form large size and complex, and achieves small curing shrinkage and easy promotion. Application, good dimensional stability

Active Publication Date: 2016-12-07
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many preparation methods for SiC ceramics, most of them are difficult to form large-sized and complex-shaped parts, sintering shrinkage and deformation are difficul

Method used

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  • Method using selective laser sintering process to produce silicon carbide ceramic part

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Embodiment 1

[0026] see figure 1 According to the first embodiment of the present invention, the method for preparing silicon carbide ceramic parts by laser selective sintering process includes the following steps:

[0027] (1) Weigh carbon powder, silicon carbide powder, adhesive and curing agent according to the predetermined mass ratio and pour them into the ball milling tank, then add an appropriate amount of balls into the ball milling tank, and ball mill at a speed of 135r / min 720min, that is, 12h, to obtain a uniformly dispersed binder-silicon carbide mixed powder.

[0028] In this embodiment, the mass ratio of the carbon powder to the silicon carbide powder is 4:96; the binder is a phenolic resin, and the mass of the phenolic resin is composed of the carbon powder and the silicon carbide powder. 25% of the mixed powder mass; the curing agent is hexamethylenetetramine, and the mass ratio of the hexamethylenetetramine to the phenolic resin is 7:100. Wherein, the D50 of the silicon ...

Embodiment 2

[0034] The method for preparing a silicon carbide ceramic part using a laser selective sintering process provided by the second embodiment of the present invention includes the following steps:

[0035] (1) Weigh carbon powder, silicon carbide powder, adhesive and curing agent according to the predetermined mass ratio and pour them into the ball milling tank, then add an appropriate amount of balls into the ball milling tank, and ball mill at a speed of 135r / min 720min, that is, 12h, to obtain a uniformly dispersed binder-silicon carbide mixed powder.

[0036] In this embodiment, the mass ratio of the carbon powder to the silicon carbide powder is 5:95; the binder is a phenolic resin, and the mass of the phenolic resin is composed of the carbon powder and the silicon carbide powder. 28% of the mass of the mixed powder; the curing agent is hexamethylenetetramine, and the mass ratio of the hexamethylenetetramine to the phenolic resin is 7:100. Wherein, the D50 of the silicon ca...

Embodiment 3

[0042] The method for preparing a silicon carbide ceramic part using a laser selective sintering process provided by the third embodiment of the present invention includes the following steps:

[0043] (1) Weigh carbon powder, silicon carbide powder, adhesive and curing agent according to the predetermined mass ratio and pour them into the ball milling tank, then add an appropriate amount of balls into the ball milling tank, and ball mill at a speed of 135r / min 720min, that is, 12h, to obtain a uniformly dispersed binder-silicon carbide mixed powder.

[0044] In this embodiment, the mass percentage of the carbon powder and the silicon carbide powder is 6:94; the binder is a phenolic resin, and the mass of the phenolic resin is composed of the carbon powder and the silicon carbide powder. 30% of the mass of the mixed powder; the curing agent is hexamethylenetetramine, and the mass ratio of the hexamethylenetetramine to the phenolic resin is 7:100. Wherein, the D50 of the silic...

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Abstract

The invention discloses a method using selective laser sintering process to produce a silicon carbide ceramic part. The method includes: weighing carbon powder, silicon carbide powder, binder and curing agent according to preset mass ratio, pouring into a ball milling tank, and performing ball milling to obtain binder-silicon carbide mixed powder; using a computer to perform three-dimensional digital modeling on the to-be-produced part, inputting three-dimensional digital model information into a selective laser sintering forming machine, using the binder-silicon carbide mixed powder as the raw material, and using selective laser sintering fast forming process to perform powder sintering forming to obtain the silicon carbide biscuit of the part; heating and curing the silicon carbide biscuit; placing the cured silicon carbide biscuit into a medium-temperature tubular sintering furnace under Ar protection so as to perform carbonization treatment to obtain a porous silicon carbide blank; performing infiltration sintering treatment on the porous silicon carbide blank under a vacuum condition to obtain the compact silicon carbide ceramic part.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, and more specifically relates to a method for preparing silicon carbide ceramic parts by using a laser selective sintering process. Background technique [0002] Through computer-aided design and manufacturing, laser selective sintering directly forms powder materials into three-dimensional solid parts with arbitrary complex structures based on the principle of layered superposition. It is one of the technologies with great development potential in the field of additive manufacturing technology. Due to the wide range of applications and high value of ceramic parts, the use of laser selective sintering to manufacture ceramic parts has always been a research hotspot in the field of additive manufacturing. SiC ceramics is a new type of ceramic material that has only been developed in recent decades. However, due to its excellent properties such as high strength, high hardness, corrosion re...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/64
CPCC04B35/565C04B35/64C04B2235/422C04B2235/428C04B2235/48C04B2235/5436C04B2235/5445C04B2235/616C04B2235/665
Inventor 刘洁付旻慧刘凯史玉升王君昆宋军曹平
Owner HUAZHONG UNIV OF SCI & TECH
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