Characteristics and application of advanced ceramic material silicon carbide fiber

　　In 2019, my country's airflow milling market, the demand for medical sectors is the largest, reaching 27%; next is the field of new materials and chemical industry, demand proportion is 11% and 10%; biological, non-metallic The needs of mine and equipment manufacturing are between 5% and 7%; the demand in new energy and food sector is between 4% -5%; other areas are all over 3%. Pharmaceutical, new materials, and chemical industry are an important downstream application market for gas flow grinding in my country.Advanced ceramics have excellent properties with high temperature, high strength and rigidity, relative weight, resistance to corrosion, but also there is a negative weaknesses of themselves: brittleness. It is an effective method for improving ceramic toughness and reliability using high-strength and high modulus of continuous ceramic fibers and matrix.

　　Currently, the preparation of many advanced ceramic materials has been used in airflow pulverizer equipment. However, the fiber reinforced ceramic matrix composite, mainly refers to a compounding which is made of carbon fiber, graphite fiber, silicon carbide fiber, silicon nitride, zirconia fiber, and the like, such as magnesium oxide, silicon oxide, silicon oxide, zirconia, and the like. Material, with high temperature compressive strength, high elastic modulus, strong oxidation resistance, and good impact resistance.

　　Silicon carbide fibers are ceramic fibers having high tensile strength, creep resistance, high temperature resistance, antioxidation, and good compatibility with ceramic matrix, aerospace, aviation, weapons, ships and nuclear industry, etc. The high-tech field has broad application prospects. Silicon carbide fibers have always been embargo in Western countries due to important application prospects in military fields. The ultrafine powder sintering method is mainly based on silicon carbide fine powder, add a certain amount of binder and sintering aid (B, Al2O3, etc.), after physical mixing, dry spinning or The fibrous fibrous fibrous wire was obtained by molten spinning, and then silicon carbide fibers were obtained by high temperature heat treatment. The silicon carbide fibers prepared by this method have good high temperature resistance and creep resistance, but the fiber has a large diameter, low strength, disadvantageous for industrial application.

　　Silicon carbide fibers can be used as a high temperature structural material such as fiber-enhanced ceramic compound composite due to good creep, oxidation, anti-chemical corrosion, and compatible ceramic matrix, can be widely used in aerospace, etc. field.

　　Further, after carbonThe silicon fiber enhanced metal matrix composite composite, with more excellent performance than strength, ratio of stiffness, thermal expansion coefficient, thermal conductivity, etc., in terms of aerospace, military weaponry and sports equipment, automotive industries Have extensive application prospects.

　　Article Source: Powder

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