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Modified silicon carbide powder and preparation method thereof

A silicon carbide powder and modification technology, which is applied in the direction of silicon carbide, carbide, grain processing, etc., can solve the problems of material plasticity improvement, local stress concentration, local work hardening, etc., and achieve small container wear, low material pollution, and low cost. low effect

Inactive Publication Date: 2009-06-10
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reinforcement particles themselves may be fractured or the interface is detached; due to the large difference in thermal expansion coefficient between the reinforcement particles and the metal matrix, it will cause local work hardening of the matrix near the particles and the appearance of three-dimensional tensile stress in the matrix; The sharp edges and corners of the reinforcement particles will cause local stress concentration; the flat surface of the reinforcement particles makes it easy to slide and separate from the metal matrix bonding interface. These factors are not conducive to the improvement of the plasticity of the material.

Method used

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  • Modified silicon carbide powder and preparation method thereof
  • Modified silicon carbide powder and preparation method thereof
  • Modified silicon carbide powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] The silicon carbide powder material that present embodiment handles, its silicon carbide particle is such as figure 1 (a), figure 1 The irregular shape of (b) (S-4800 field emission scanning electron microscope, the powder sample is spread on the conductive glue, respectively magnified by 5000 times and 10000 times), and the volume average particle size is 7.4 μm.

[0028] Its preparation method is to use image 3 The silicon carbide powder modification treatment device shown includes a cylindrical grinding chamber 4 with a conical bottom, a classification wheel 5, a cyclone dust collector 6, an induced draft fan 8, and a hopper 3, and the hopper 3 is located at the cylindrical grinding chamber with a conical bottom. In the lower part of the chamber 4, silicon carbide powder to be processed is introduced into the conical-bottomed cylindrical grinding chamber 4; the lower part of the conical-bottomed cylindrical grinding chamber 4 is provided with a bottom nozzle 1 to p...

Embodiment 2

[0032] The silicon carbide powder material that present embodiment handles, its silicon carbide particle is such as figure 1 The irregular shape of (a) and (b) (S-4800 field emission scanning electron microscope, the powder sample is spread on the conductive glue, the magnifications are 5000 times and 10000 times respectively), and the volume average particle size is 7.4 μm.

[0033] Its preparation method is to use image 3 In the silicon carbide powder modification treatment device shown, turn on the induced draft fan 8, introduce 5kg of silicon carbide into the cylindrical grinding chamber 4 at the bottom of the cone, open the bottom nozzle 1, pass in 0.01MPa dry and purified compressed air, and then open four levels Cloth the two of the spray nozzles 2, pass through 0.2MPa dry and purified compressed air, grind for 1 hour, then increase the pressure to 0.4MPa, continue grinding for 2 hours, the treatment effect can be seen Figure 4 (a), (b).

[0034] and figure 2 Same...

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Abstract

The invention relates to modified silicon carbide powder and a preparation method thereof. The modified silicon carbide powder is characterized in that the silicon carbide powder consists of silicon carbide particles with rough microscopic surfaces, round shapes and no sharp edges and corners. The method comprises the following steps: by utilizing a process technical method that high-energy airflow drives ground powder to relatively move to cause the mutual clash and grinding among power particles to grind, the modification treatment is performed on the silicon carbide powder particles with the sharp edges and corners as well as straight or step-like surfaces to ensure that the silicon carbide powder particles have the rough microscopic surfaces as well as round and smooth shapes to be further used for improving the performance of metal-based composite materials.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramic powder, and in particular relates to a modified silicon carbide ceramic powder material and a preparation method thereof. Background technique [0002] Silicon carbide materials are widely used in metallurgy, machinery, chemical industry, building materials and other industrial fields because of their excellent physical and chemical properties such as high temperature resistance, corrosion resistance, thermal stability, and high hardness. They are also used in high-tech industries such as electronics, electrical, and aerospace Also favored. Most of the industrially produced silicon carbide is a large crystal block, which requires further crushing and classification before it can be used as a raw material. Silicon carbide is a superhard substance (Mohs hardness 9.2-9.5). Crusher, ball mill, jet mill, etc. are mostly used for powder preparation. Regardless of the size of the obtaine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B02C19/06B02C23/08C01B32/956
Inventor 马自力樊建中左涛张琪徐骏石力开
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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