Alumina ceramics can be divided into high-purity type and common type

4Industry

You are here: Home -> Industry -> Alumina ceramics can be divided into high-purity type and common type

High purity alumina ceramics with Al2O3 content of more than 99.9% are generally made into molten glass to replace platinum due to their sintering temperature of 1650-1990 ℃
and transmission wavelength of 1-6 μ m; they are used as sodium lamp tubes by their light transmittance and corrosion resistance;
they can be used as integrated circuit substrates and high-frequency insulation materials in the electronics industry.
According to the content of Al2O3, ordinary alumina ceramics can be divided into 99, 95, 90 and 85 ceramics.
Sometimes, alumina ceramics with Al2O3 content of 80% or 75% can also be classified as ordinary alumina ceramics. Among them,
99 alumina ceramic materials are used to make high-temperature ***** and fire-resistant furnace tubes and special wear-resistant materials,
such as ceramic bearings, ceramic seals and water valve plates; 95 alumina ceramic is mainly used as corrosion-resistant and wear-resistant parts;
85 ceramics are often mixed with part of **** to improve the electrical performance and mechanical strength,
which can be sealed with molybdenum, niobium, tantalum and other metals, and some are used as electric vacuum devices.

1. hardness
The Rockwell hardness is hra80-90, which is much higher than that of wear-resistant steel and stainless steel.
2. Excellent wear resistance
The wear resistance of the Powder Metallurgy Research Institute of Central South University is 266 times that of manganese steel and 171.5 times that of high chromium cast iron.
According to our more than ten years of customer tracking survey, under the same working condition, the service life of the equipment can be extended at least ten times.
3. light weight
Its density is 3.5g/cm3, only half of that of steel, which can greatly reduce the equipment load.
Main technical indexes of alumina ceramics
Alumina ceramic content ≥ 92%; density ≥ 3.6 g / cm3; Rockwell hardness ≥ 80 HRA; compressive strength ≥ 850 MPa; k i c ≥ 4.8mpa · M1 / 2;
bending strength ≥ 290mpa; thermal conductivity 20W / m.k; thermal expansion coefficient: 7.2 × 10-6m / m.k;

Back

Prev:Why to use zirconia ceramic dispensing valve

Next:Mingjue zirconia ceramic filling pump