Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation of Complex Shape Silicon Carbide Ceramics by Solid State Sintering of Phenolic Resin as Carbon Source

A technology of shape silicon carbide and phenolic resin, which is applied in the field of preparation of silicon carbide ceramics, can solve the problems of high preparation cost, complicated process, and low product pass rate, and achieve the effects of excellent mechanical properties, improved pass rate, and reduced production cost

Inactive Publication Date: 2016-05-25
CHINA IRON & STEEL RES INST GRP +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for preparing complex-shaped silicon carbide ceramics by solid-phase sintering with phenolic resin as a carbon source, which solves the low product qualification rate; and the silicon carbide green body needs to be placed in different furnaces for debinding and sintering respectively , complex process, high preparation cost and other issues

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation of Complex Shape Silicon Carbide Ceramics by Solid State Sintering of Phenolic Resin as Carbon Source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dilute 2000g of silicon carbide powder, 20g of boron carbide powder, and 100g of phenolic resin into deionized water, use SiC balls as the grinding medium, all powders: SiC balls = 1.5︰1, ball mill for 8 hours, dry and crush And pass through a 60-mesh sieve to obtain powder;

[0032] The sieved powder is formed into a silicon carbide ceramic billet by a 60MPa hydraulic press;

[0033] After dry pressing, the billet is kept at 185MPa for 10 minutes on a cold isostatic press to obtain a denser and more uniform billet;

[0034] Place the billet after cold isostatic pressing in a uniformly heated oven at 175°C for 4 hours;

[0035] Place the dried silicon carbide ceramic billet on a grinding machine to grind it flat to obtain a reference plane, draw a drawing of the silicon carbide green billet according to the original silicon carbide ceramic product drawing, input it into the CNC machine tool, and then machine the green billet;

[0036] Place the processed silicon carbi...

Embodiment 2

[0038] After diluting 1000g of silicon carbide powder, 8g of boron carbide powder and 60g of phenolic resin, they were added to deionized water, and silicon carbide balls were used as the grinding medium. obtain powder;

[0039] The spray granulated powder is directly pressed on a cold isostatic press at 170MPa for 8 minutes to obtain a dense and uniform SiC ceramic body;

[0040] Place the billet after cold isostatic pressing in a uniformly heated oven at 165°C for 3 hours;

[0041] Place the dried silicon carbide ceramic billet on a grinding machine to grind it flat to obtain a reference plane, draw a drawing of the silicon carbide green billet according to the original silicon carbide ceramic product drawing, input it into the CNC machine tool, and then machine the green billet;

[0042] Place the processed silicon carbide ceramic green body in a pressureless sintering furnace for debonding and sintering, maintain a vacuum atmosphere during debonding, raise it to 800°C at ...

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
particle diameteraaaaaaaaaa
purityaaaaaaaaaa
shrinkageaaaaaaaaaa
Login to View More

Abstract

The invention discloses a process for preparing silicon carbide ceramic in a complicated shape from phenolic resin serving as a carbon source by adopting solid phase sintering, and belongs to the technical field of silicon carbide ceramic preparation. By adopting SiC powder as a raw material, B4C powder and water-soluble phenolic resin as sintering aids, and deionized water as a solvent, the process comprises six steps, namely mixing, drying and sieving or spray drying, cold isostatic pressing after dry pressing or direct cold isostatic pressing, drying, machining, and un-sticking and sintering. The purpose of preparing the silicon carbide ceramic with excellent performance and the complicated shape from the phenolic resin serving as the carbon source by adopting solid phase sintering is achieved. Compared with other methods for preparing the silicon carbide ceramic by adopting reactive sintering or other solid phase sintering, the process has the advantages that the water-soluble phenolic resin is used as the carbon source, so that the carbon source is distributed more uniformly; the phenolic resin is cracked at a high temperature to generate carbon with higher activity, so the phenolic resin is favorable for preparing silicon carbide ceramic with better performance; and a silicon carbide ceramic biscuit is prepared by adopting cold isostatic pressing after dry pressing or direct cold isostatic pressing and machining, so compared with a gel injection molding process, the process is influenced little by environmental factors, the yield of the product is higher and the process is more suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of preparing silicon carbide ceramics, and in particular relates to a process for preparing complex-shaped silicon carbide ceramics by solid-phase sintering using phenolic resin as a carbon source, including molding and sintering. Background technique [0002] Silicon carbide ceramics are widely used in industrial production due to their excellent properties such as good high temperature stability and thermal conductivity. Compared with reaction-sintered silicon carbide ceramics, solid-phase sintered silicon carbide ceramics have better high temperature stability, corrosion resistance and better mechanical properties because they do not contain free silicon, so they have better application prospects. At present, silicon carbide ceramics prepared by solid phase sintering mostly use graphite or carbon black as the carbon source, while the present invention uses phenolic resin as the carbon source. The carbon ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/634
CPCC04B35/565C04B2235/3821C04B2235/48C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567
Inventor 贺智勇张启富千粉玲王晓波
Owner CHINA IRON & STEEL RES INST GRP