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Carbon/graphite/glass fiber/copper filled PTFE plates, rods, tubes, non-standard seals
I. Inorganic Materials Inorganic materials
1. glass fiber powder: white, density 2.3g/cm3, with good mechanical properties, adding glass fiber can correct compressive strength, wear resistance, dimensional stability, resistance to strong acids, strong oxidants, but not resistant to hydrofluoric acid and alkali.
2. graphite: iron black to dark iron gray, is a crystalline carbon, belongs to the hexagonal crystal system, is leaf-shaped, contact with a slippery feeling, density of 2.09-2.25g/cm3. It has good electrical conductivity, plasticity, lubricity, abrasion resistance, resistance to chemical requirements, especially resistance to corrosive gases, can improve the resistance to cold flow, reduce the initial wear and tear
3. molybdenum disulfide: black gray with silver gray powder, metallic luster, density of 4.6 * 4.8g/cm3, with a hexagonal layer structure, contact with a slippery feeling, low coefficient of friction, thermal conductivity is good, adding molybdenum disulfide can increase surface hardness, reduce the amount of initial wear, generally used in conjunction with glass fiber, bronze powder
4. carbon fiber powder: black, density of 1.78g/cm3, with good resistance to high and low temperature performance, thermal conductivity, chemical resistance, abrasion resistance, tensile strength and elongation than the use of graphite and other fillers when the superiority of creep resistance, filler tetrafluoro products can improve the abrasion resistance in air and water
5. Special fiber: gray-brown, density of 2.65g/cm3, the main properties of superior high temperature and ultra-low temperature resistance, can be used at -269~700 degrees, excellent thermal and chemical stability, acid and alkali resistance and carbon fiber performance is consistent with the good electrical insulation and corrosion resistance.
II. Metallic materials
1. Bronze powder: 6-6-3 tin bronze powder, density 8.8g/cm3. Mainly provide products with wear resistance, creep resistance, compressive strength, hardness and dimensional stability. Good thermal conductivity, can provide the mechanical strength of products
2. Stainless steel powder: gray, -500 mesh, density 7.85-8.1g/cm3 316 material stainless steel powder density 8.03g/cm3, can improve the mechanical properties of the products, dimensional stability, chemical resistance, abrasion resistance.
III. Organic materials
1. polyphenylene ester: light yellow powder, density 1.45g/cm3, machine temperature 530 degrees, can be used at 300 degrees for a long time, has a fairly good self-lubricating, temperature resistance, wear resistance, good thermal conductivity. Composite with PTFE has high temperature resistance, self-lubricating, compression creep resistance, good dimensional constancy, is the ideal engineering plastic products of low friction and wear resistance, especially used as bearing materials.
2. para-polybenzene: brown or dark brown powder, density of 1.24g/cm3, high temperature resistance, resistance to irradiation, chemical corrosion resistance, self-lubricating properties, due to graphite and molybdenum disulfide
Performance of filled PTFE products
Polytetrafluoroethylene resin with different ratios of glass fiber, carbon fiber, graphite, bronze powder, molybdenum disulfide, polyphenylene ester, para-polyphenylene and other filler modification of the main properties are: abrasion resistance can be increased by about 1,000 times, creep resistance may be increased by 2-3 times, the bending modulus of elasticity can be increased by 2-3 times, thermal conductivity can be increased by 2 times, the hardness increased by 10-30%, and the coefficient of linear expansion is reduced by 1/2. Unfavorable effects are increased void ratio, increased water absorption, and decreased dielectric properties.
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