Silicon carbide, mainly consisting of SiC, also known as carborundum, is a hard chemical compound containing silicon and carbon.Download PDF
|物品||Recrystallized SiC||Sintered SiC||Reaction Bonded SiC|
|Purity of Silicon Carbide||99.5％||98％||> 88％|
|Compressive strength (MPa)||> 300||2200||2100|
|Thermal conductivity (W/m.K)||35〜36||110||65|
|主要特征||High temp. High resistance.
Reaction Bonded SiC has the lowest cost production technique with a course grain. Reaction Bonded SiC provides somewhat lower hardness and use temperature, but higher thermal conductivity. Reaction bonded silicon carbide has high strength, high hardness, hig abrasion resistance, high temperature resistance, corrosion resistance, good oxidation resistance, good thermal shock resistance, good thermal conductivity, rapid cooling and rapid heat resistance and high temperature creep resistance, etc. It can be made into beam, roller, cooling air pipe, thermocouple protection pipe, temperature measuring pipe, burner nozzle, wear-resisting parts, corrosion-resisting parts, sealing parts and a variety special-shaped structural parts.
Compared with reaction bonded silicon carbide, pressureless sintered silicon carbide has higher purity, better mechanical properties, more prominent corrosion resistance ( Resistantto strong acid and alkali corrosion, It is also the only ceramic material which can resistant to hydrofluoric acid corrosion ), higher wear resistance, because of there’s no free silicon in the material can be used in other materials can not meet the environment, longer service life.
At present, the use of our company’s high wear-resistant ceramic lined steel pipe dozens of thermal power plant practice shows that: ceramic lined steel pipe anti-wear ability, anti-fluid erosion ability.
And it has developed rapidly. When transporting the materials with the harder abrasion (such as ash dregs, slag, coal powder, mining dregs, the rest mines, cement, etc), it will exit the problem that the abrasion of pipes is too rapid. Especially, the abrasion of bent pipes is greatly more rapid.
In a duct, the elbow wear the fastest, in practice, Ceramic lined pipe used after 1 to 2 years to open the observation and measurement, the composite layer are no obvious wear or tear off, ceramic-coated steel pipe wear Than the thick-walled wear-resistant cast steel pipe increased by nearly 10 times.
Heat Exchanger Tubes
Pumps must operate in an infinite variety of demanding environments. Sintered Silicon Carbide offers a high performance seal face material that has proven successful in such diverse pumping applications as chemical processing, refining, mining and pulp and paper processing. The material provides superior corrosion and abrasion resistance; shock resistance; and low sliding friction against a wide range of mating materials.
的最先进的magnetically driven pumps, sintered silicon carbide is particularly suited for thrust and journal bearing components. Excellent corrosion resistance provides optimum performance in many chemical environments. High thermal conductivity minimizes the likelihood of failure due to thermal shock, and its specific strength makes it safe to use at high rotational speeds. Bearing components are usually produced as tight tolerance precision ground parts.
Automotive Components and Seal Faces
由于它们对磨损和热休克的耐药性更大，因此烧结的碳化硅密封面用于汽车水泵，它代替了由氧化铝等材料制成的密封面。在许多情况下，该材料已被证明更适合满足美国和欧洲车辆的性能需求 - 即持续车辆的寿命而不会泄漏。这些组件是通过常规的大量压力和注入模制来制造的，以满足应用程序的经济限制。
Sintered Silicon Carbide is probably the most popular ceramic alternative to tungsten carbide for blast nozzle applications. Typically providing long life (50% over WC) due to excellent wear and corrosion resistance. The low wear rate maintains the internal nozzle geometry and provides maximum blasting effectiveness, minimum compressor requirements and reduced downtime due to replacement. Sintered silicon carbide is also about one fifth the weight of Tungsten Carbide, so the blasting operation is also easier for the operator. Nozzles are often produced as semi finished (non-ground) components thereby reducing costs.
Process Industry Valve Applications
Paper Industry Applications
The excellent corrosion and wear resistance of sintered silicon carbide provides hard surfaces that can be machined to smooth, highly polished finishes. These finishes offer low coefficients of friction and compatibility with forming fabrics. Tiles, inserts and palm guides are available in finished and semi-finished forms.
Centrifuge Tiles and Wear Parts
Often used in applications where tungsten carbide and alumina fail to provide optimum lifetime performance.
The benefit of using silicon carbide for semiconductor components includes; the thermal expansion match to silicon, the resistance to wear and chemical corrosion which leads to reduced maintenance and component recycling. The material is well suited as a structural material for low mass silicon wafer handling components and rigid, dimensionally stable platforms due to its lightness in weight and high elastic modulus. Typical applications include vacuum chucks, chemical mechanical polishing blocks, wafer carriers, and thermocouple protection tubes.
If the method used is not correct, the silicon carbide ceramics will be damaged. We can extend its service life by regular maintenance.
Our Silicon Carbide Tubes (SiC Tubes) are carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.
Typical silicon carbide applications include:
冶金和电力行业原因:这两个行业together is mainly because the two industries have a large number of metal pipes for the transmission of coal powder, ash, mud, and the like. After using the wear-resistant elbow pipe, the advantages of strong wear resistance, long life and easy installation are immediately highlighted.
Mining industry: If the wear-resistant elbow pipe is not used, the ordinary pipe is used for the transportation of the ore powder. Due to the filling of the mine and the transportation of the concentrate powder, the wear of the pipe is relatively large, so that the life of these pipes is only about one year. After wearing elbow pipes, the life of such pipes will be extended by a factor of five.