Method for preparing silicon carbide/molybdenum disilicide composite ceramic through reaction sintering

A technology of composite ceramics and molybdenum disilicide, which is applied in the field of reaction sintering to prepare silicon carbide/molybdenum disilicide composite ceramics, achieving good mechanical properties, low sintering temperature, and extended application

Inactive Publication Date: 2016-11-16
浙江东新新材料科技有限公司
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies did not start from the perspective of the ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering, the following steps are carried out in sequence:

[0020] A. Preparation of main raw materials:

[0021] Mix 65 parts of silicon carbide powder, 15 parts of molybdenum powder, and 20 parts of graphite powder as the main raw materials;

[0022] B, after the main raw materials are uniformly mixed, add 4 parts of polyvinyl alcohol as a binder, 1.5 parts of tetramethylammonium hydroxide as a dispersant, mechanical ball milling to prepare silicon carbide composite powder (can pass through a 100-mesh sieve);

[0023] That is, polyvinyl alcohol accounts for 4.0% of the main raw material gross weight, and tetramethylammonium hydroxide accounts for 1.5% of the main raw material gross weight;

[0024] C. Placing the granulated powder (i.e., the silicon carbide composite powder obtained in step B) in a mold and forming it once by dry pressing (with a pressure of 50...

Embodiment 2

[0027] Embodiment 2, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering,

[0028] Mix 65 parts of silicon carbide powder, 10 parts of molybdenum powder, and 25 parts of graphite powder as the main raw materials;

[0029] The weight ratio of green body to metal silicon wafer is 1:3.0;

[0030] The rest are equal to Example 1.

[0031] The bulk density of the obtained silicon carbide / molybdenum disilicide composite ceramics is 2.7-3.0g / cm 3 , the flexural strength is greater than 150MPa, the elastic modulus is above 50GPa, and the oxidation resistance is above 1450°C.

Embodiment 3

[0032] Embodiment 3, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering,

[0033] Mix 60 parts of silicon carbide powder, 15 parts of molybdenum powder, and 25 parts of graphite powder as the main raw materials;

[0034] The weight ratio of green body to metal silicon wafer is 1:3.5;

[0035] The rest are equal to Example 1.

[0036] The bulk density of the obtained silicon carbide / molybdenum disilicide composite ceramics is 2.9-3.15g / cm 3 , the flexural strength is greater than 250MPa, the elastic modulus is above 80GPa, and the oxidation resistance is above 1550°C.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Densityaaaaaaaaaa
Flexural strengthaaaaaaaaaa
Elastic modulusaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing silicon carbide/molybdenum disilicide composite ceramics by reaction sintering. ~15% molybdenum, 15%~25% graphite; B. After mixing the main raw materials evenly, add polyvinyl alcohol as a binder and tetramethylammonium hydroxide as a dispersant, and prepare silicon carbide composite by mechanical ball milling powder; C, placing the granulated powder in a mold and forming it once by dry pressing to obtain a green body; D, placing the above-mentioned green body on a graphite plate, and then placing a metal silicon chip on the green body, and the green body The weight ratio to the metal silicon sheet is 1:2.5-3.5, and the silicon carbide/molybdenum disilicide composite ceramic is obtained by high-temperature silicon infiltrating sintering at 1500-1600°C for 3-6 hours.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering. Background technique [0002] Reaction sintered silicon carbide is made of fine particles of α-SiC and additives pressed into a green body, which is in contact with liquid silicon at high temperature. The carbon in the green body reacts with the infiltrated Si to form β-SiC, which is combined with α-SiC. The free silicon fills the pores, resulting in a highly dense ceramic material. The density of this sintered silicon carbide can reach 3.08g / cm 3 , the size of the product is almost unchanged before and after sintering, so it can be processed into any shape and size after molding, especially suitable for large-scale and complex-shaped products. The production process of reaction sintered silicon carbide is simple, the cost is low, and the application fields are very wide. However, since the product generally contains 8% to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/565
CPCC04B35/565C04B2235/3891C04B2235/425C04B2235/77
Inventor 郭兴忠杨辉郑浦高黎华
Owner 浙江东新新材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap