Silicon Nitride ceramic custom roller wheel caster
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Silicon Nitride Ceramic:
The term silicon nitride was first seen in the "Shen Yi Jing·Zhonghuang Jing" written by Dongfang Shuo in the Western Han Dynasty: "There is a palace in the northwest, and the brass wall is the palace of the sun and earth."
What kind of copper alloy this "brass" refers to is to be tested. "Xin Tang Shu Shi Hu Zhi" also has the titles of "bronze" and "brass", which respectively refer to the color of the ore and the smelted product. "The pit has a special name, but the mountains are more common" refers to the pure copper refined by the fire method. . The term brass specifically refers to copper-zinc alloys, which began in the Ming Dynasty, and its records are found in the "Ming Huidian": "The examples in Jiajing Zhongzheng, Tongbao is 6 million literals, and the two-fire brass is 47,270. Two catties..." Through the analysis of the composition of the copper coins in the Ming Dynasty, it is found that the real brass in the "Ming Hui Dian" appeared much later than other copper alloys. This is because the copper in the brass Obtaining metallic zinc is more difficult. Zinc oxide can be reduced to metallic zinc relatively quickly at a high temperature of 950°C-1000°C, while liquid zinc has already boiled at 906°C, so the reduced metallic zinc exists as a vapor. The reaction reverses during cooling, and the vapor zinc is the carbon dioxide in the furnace and then oxidized to zinc oxide. Therefore, a special condensing device is necessary to obtain metallic zinc. This is the reason why the use of metallic zinc was much later than the use of copper, lead, tin, and iron, and one of the reasons why brass coins appeared late.
properties:
High hardness, high strength, wear resistance, corrosion resistance, high temperature(1200°), good thermal diffusivity, good thermal shock resistance(avoid the temperature changing rapidly), good insulativity, low density. The comprehensive properties are best in most of structure ceramic.
Data Sheet↓
Color: Black Grey
Density: ＞3.2g/cm3
Hardness: HRA90
Vickers Hardness (Hv50): ＞1550 HV0.5
Modulus of Elasticity: 290Gpa
Flexural Strength: ＞600Mpa
Compressive Strength: 2500Mpa
Modulus of Elasticity(25°C): 65Gpa
Fracture toughness:＞6.0 Mpam1/2
Maximum Use Temperature: 1200°C
Thermal Conductivity:15-20 W(m.K)
Thermal Expansion Coefficient: ＞3.1 10-6/°C
Thermal Shock Resistance: 500 △T°C
Special Heat Capacity: 700 KJ/kg.K
Dielectric Strength: 1 KV/mm
Dielectric Constant: er
Volume Resistivity(20°C): 1.0*10(12)Ω.cm
Application industry:
Machinery, electronic, semiconductor, chemical, petroleum, smelt.
Specific application:
Welding shaft, electronic substrate, plunger, nozzle, slide guide, diesel parts, metal molding, shaft wheels etc.
Why Choose Us? 1.12 years of professional production industrial ceramics factory 2.High quality products with low price 3.High precision parts with lowest tolerance 4.Short time for production 5.Has a group of experienced, professional and efficient R&D team 6.Has a good reputation in China and abroad. 7.MOQ is not limited, small quantity is welcome.
8.Vigorous team and good after-sales service
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