High-bending-strength porous silicon carbide ceramic and preparation method thereof

Abstract

The invention discloses a high-bending-strength porous silicon carbide ceramic which is prepared from the following raw materials in parts by weight: 45-52 parts of silicon carbide fine powder with the particle size of 80-120 mu m, 36-40 parts of silicon carbide medium powder with the particle size of 120-160 mu m, 15-18 parts of silicon carbide coarse powder with the particle size of 160-200 mu m, 12-16 parts of tantalum nitride powder, 8-14 parts of tungsten boride powder, 9-12 parts of activated carbon powder, 5-8 parts of epoxy resin and 4-6 parts of tungsten powder. The invention also discloses a preparation method of the high-bending-strength porous silicon carbide ceramic. On the premise of ensuring the porosity of 47.3% or above, the bending strength of the high-bending-strength porous silicon carbide ceramic reaches 92.8-108.6 MPa, thereby greatly enhancing the bending strength of the porous silicon carbide ceramic. Various devices prepared from the high-bending-strength porous silicon carbide ceramic have the advantages of high durability and long service life, thereby lowering the use cost.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a porous silicon carbide ceramic with high bending strength and a preparation method thereof. Background technique [0002] With the development of modern science and technology, many new ceramic varieties have emerged in the past century. They no longer use or rarely use traditional ceramic raw materials such as clay, feldspar, and quartz, but use other special raw materials, and even expand to the scope of non-silicate and non-oxide, and many new processes have emerged. The literature of the United States and some European countries has understood the term "Ceramic" as a general term for various inorganic non-metallic solid materials. Therefore, the meaning of ceramics has actually gone far beyond the narrow traditional concept in the past. Silicon carbide ceramics is a new type of ceramics. [0003] Silicon carbide ceramics not only have excellent mechanical prope...

AI Technical Summary

Problems solved by technology

However, the existing porous silicon carbide ceramic materials have limited flexural strength, and filter materials, catalyst supports, etc. prepared using this material are easily damaged during use.