conductivity 95 96 alumina ceramic fixture sheet substrate

conductivity 95 96 alumina ceramic fixture sheet substrate

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Alumina Ceramics:

Alumina ceramic gas phase method, ethylene polymerizes in gaseous state, generally a fluidized bed reactor is used. There are two types of catalysts: chromium series and titanium series, which are quantitatively added into the bed from a storage tank, and high-speed ethylene is circulated to maintain the fluidization of the bed and remove the heat of polymerization. The polyethylene produced is discharged from the bottom of the reactor. The pressure of the reactor is about 2 MPa, and the temperature is 85-100°C. The gas phase method is the most important method for the production of linear low-density polyethylene. The gas phase method eliminates the solvent recovery and polymer drying processes, and saves 15% of the investment and 10% of the operating cost compared with the solution method. It is 30% of the investment of the traditional high pressure method and 1/6 of the operating cost. As a result, it has developed rapidly. However, the gas phase method needs further improvement in product quality and variety. Using a chromium catalyst supported on silica gel, ethylene is polymerized under medium pressure in a loop reactor to produce high-density polyethylene.
Processing and application 　It can be processed by blow molding, extrusion, injection molding, etc. It is widely used in the manufacture of films, hollow products, fibers and daily sundries. In actual production, in order to improve the stability of polyethylene to ultraviolet rays and oxidation, and improve processing and use performance, a small amount of plastic additives must be added. Commonly used ultraviolet absorbers are o-hydroxybenzophenone or its alkoxy derivatives, etc. Carbon black is an excellent ultraviolet shielding agent. In addition, antioxidants, lubricants, colorants, etc. are also added to expand the application range of polyethylene. High-pressure polyethylene: More than half is used for film products, followed by pipes, injection molded products, wire wraps, etc.
Low and medium pressure polyethylene: mainly injection molded products and hollow products.
Ultra-high-pressure polyethylene: Due to the excellent comprehensive properties of ultra-high molecular polyethylene, it can be used as engineering plastics.

High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc. 

Data Sheet↓

Thermal Shock Resistance: 200 △T°C

Maximum use temperature 1650°C

Dielectric Strength: ＞10 KV/mm

Dielectric Constant: 9.1er

Dielectric Loss Angle(1MHz): 0.0002-0.0003

Volume Resistivity(20°C): ＞1014Ω.cm

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