Introduction to the characteristics, processes, and applications of alumina precision ceramics

Alumina precision ceramics is a ceramic material based on aluminum oxide (Al₂O₃). It has the characteristics of high hardness, high strength, high stability, good wear resistance, and biocompatibility. The following is a detailed introduction to alumina precision ceramics:

1. Types and characteristics

Alumina precision ceramics are divided into two types: high purity type and ordinary type. The Al₂O₃ content of high-purity alumina precision ceramics is more than 99.9%, the sintering temperature is as high as 1650~1990℃, and the transmission wavelength is 1~6μm. The Al₂O₃ content of ordinary alumina precision ceramics is usually 99%, 95%, 90%, 85%, etc. Sometimes those with an Al₂O₃ content of 80% or 75% are also classified as ordinary alumina precision ceramics series.

Alumina precision ceramics have high hardness, with a Mohs hardness of 9, second only to diamond. In addition, it also has good wear resistance, high mechanical strength, high-temperature stability, and chemical stability. It does not react with strong acids and alkalis, and its melting point is as high as 2054 degrees Celsius.

Alumina precision ceramics also have good biocompatibility and can be directly applied to the human body and living organisms.

2. Production process

The production of alumina precision ceramics includes selecting appropriate raw materials (such as alumina powder), molding processes (such as dry pressing, isostatic pressing, hot die casting, injection, grouting, tape casting, etc.), sintering systems (such as atmospheric pressure sintering), pressure sintering, atmosphere sintering, reaction sintering, etc.) and grinding processing and other links.

The choice of molding process will affect the green embryo density, which in turn affects the porcelain density and performance of the ceramic. A good sintering system can obtain ceramics with higher density, lower porosity, and stronger mechanical properties.

3. Application fields

Alumina precision ceramics are widely used in various fields because of their excellent performance. In the electronics industry, it can be used as integrated circuit substrates, high-frequency insulating materials, ceramic backplanes, substrates, ceramic films, transparent ceramics, etc. Transparent ceramics, in particular, in addition to having a wide range of light transmittance, also have the advantages of high thermal conductivity, low electrical conductivity, high hardness, high strength, and low dielectric loss.

In the chemical industry, alumina precision ceramics can be used to make ceramic chemical filler balls, inorganic microfiltration membranes, corrosion-resistant coatings, etc.

In the medical field, alumina precision ceramics are more commonly used to manufacture artificial bones, artificial joints, artificial teeth, etc.

In addition, alumina precision ceramics are also used in the manufacture of industrial valves such as cutting tools, ball valves, plug valves, gate valves, globe valves, etc., as well as in the cutting of difficult-to-machine materials such as high-speed dry cutting and ultra-high-speed cutting.

In general, alumina precision ceramics have become more and more widely used in modern society due to their excellent physical and chemical properties, meeting the needs of daily use and special properties. The above information is for reference only. If you need more professional information about alumina precision ceramics, it is recommended to consult relevant books or consult experts in the ceramic field.