In the 21st century, with the development of science and technology, information, energy, materials, biological engineering has become the four pillars of the development of today’s social productivity, silicon carbide due to stable chemical properties, high thermal conductivity, thermal expansion coefficient of small, small density, good wear resistance, high hardness, high mechanical strength, chemical corrosion resistance and other characteristics, rapid development in the field of materials, Widely used in ceramic ball bearings, valves, semiconductor materials, gyro, measuring instrument, aerospace and other fields.
Silicon carbide ceramics have been developed since the 1960s. Previously, silicon carbide was mainly used in mechanical grinding materials and refractories. Countries all over the world attach great importance to the industrialization of advanced ceramics, and now it is not only satisfied with the preparation of traditional silicon carbide ceramics, the production of high-tech ceramics enterprises develop faster, especially in developed countries. In recent years, multi-phase ceramics based on SIC ceramics have appeared one after another, improving the toughness and strength of monomer materials. Silicon carbide main four fields of application, that is, functional ceramics, advanced refractory materials, abrasives and metallurgical raw materials.
Silicon carbide ceramics have excellent wear resistance
Silicon carbide ceramics this product has been studied and determined. The wear resistance of silicon carbide ceramics this product is equivalent to 266 times of manganese steel, equivalent to 1741 times of high chromium cast iron. The wear resistance is very good. It can still save us a lot of money. Silicon carbide ceramics can be used continuously for more than ten years.
Silicon carbide ceramics have high strength, high hardness and light weight
As a new type of material, the use of silicon carbide ceramics this product strength is very high, high hardness, weight is also very light, such silicon carbide ceramics in use, installation and replacement of the above will be more convenient.
The inner wall of silicon carbide ceramic is smooth and does not block powder
Silicon carbide ceramics this product is fired after high temperature, so the structure of silicon carbide ceramics is relatively dense, the surface is smooth, the beauty of use will be more good, so used in the family, the beauty will be more good.
The cost of silicon carbide ceramics is low
The cost of manufacturing silicon carbide ceramics itself is relatively less, so we do not need to buy the price of silicon carbide ceramics cost too much, so for our family, but also can save a lot of money.
Silicon carbide ceramic application:
Silicon carbide ceramic ball
Silicon carbide ceramic ball has excellent mechanical properties, excellent oxidation resistance, high abrasion resistance and low friction coefficient. Silicon carbide ceramic ball high temperature strength, ordinary ceramic material at 1200 ~ 1400 degrees Celsius strength will be significantly reduced, and silicon carbide at 1400 degrees Celsius bending strength is still maintained at a higher level of 500 ~600MPa, so its working temperature can reach 1600 ~ 1700 degrees Celsius.
Silicon carbide composite material
Silicon carbide matrix composites (SiC-CMC) have been widely used in the field of aerospace for their high temperature thermal structures due to their high toughness, high strength and excellent oxidation resistance. The preparation process of SiC-CMC includes fiber preforming, high temperature treatment, mesophase coating, matrix densification and post-treatment. High strength carbon fiber has high strength and good toughness, and the prefabricated body made with it has good mechanical properties.
Mesophase coating (that is, interface technology) is the key technology in the preparation process, the preparation of mesophase coating methods include chemical vapor osmosis (CVI), chemical vapor deposition (CVD), sol-sol method (Sol-gcl), polymer impregnation cracking method (PLP), the most suitable for the preparation of silicon carbide matrix composites are CVI method and PIP method.
Interfacial coating materials include pyrolytic carbon, boron nitride and boron carbide, among which boron carbide as a kind of oxidation resistance interfacial coating has been paid more and more attention. SiC-CMC, which is usually used in oxidation conditions for a long time, also needs to undergo oxidation resistance treatment, that is, a layer of dense silicon carbide with a thickness of about 100μm is deposited on the surface of the product by CVD process to improve its high-temperature oxidation resistance.
Post time: Feb-14-2023