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The difference between ceramic sand and white corundum and particle size detection method

Release Time:

2021-07-15

White corundum is made of high-quality alumina powder, which is smelted in an arc at a high temperature of more than 2000 degrees and then cooled. shape. So what are the differences between ceramic sand and white corundum and what are the particle size detection methods?

White corundum is suitable for the manufacture of ceramics, resin-bonded abrasive tools, grinding, polishing, sandblasting, precision casting (corundum for precision casting), etc., and can also be used to manufacture refractory materials, code name WA; consistent with international general standards and national standards, most For export, there are also quantitative supply to domestic users.

The physical and chemical properties of ceramic sand make it occupy a pivotal position in aviation, aerospace, electronics, machinery and today's rapidly developing IT industry. Its inherent molecular chain structure, crystal shape and lattice change rules make it have High temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect and its optical properties play an increasingly important role in many high-tech products.

The difference between ceramic sand and white corundum and particle size detection method

At present, for the abrasive industry, there is no good or bad in the market. The two categories have their own uses. The abrasive is determined according to the material to be ground. For a certain material to be ground, there is only one suitable for say. The high-speed steel commonly used in the factory uses corundum; and the grinding cemented carbide uses silicon carbide.

Four detection methods of white corundum particle size:

(1) Sieve method.

Advantages: simple, intuitive, low equipment cost, often used for samples larger than 40um.

Disadvantage: The results are greatly affected by human factors and screen hole deformation.

(2) Microscope (image) method.

Advantages: Simple and intuitive, can be used for morphology analysis, suitable for samples with narrow distribution (the ratio of larger and smaller particle sizes is less than 10:1).

Disadvantages: poor representativeness, it is troublesome to analyze samples with a wide distribution range, and samples smaller than 1um cannot be analyzed.

(3) Settlement method (including gravity settlement and Lixin settlement).

Advantages: The operation is gradual, the instrument can run continuously, the price is low, the accuracy and repeatability are good, and the test range is wide.

Disadvantages: The test time is long and the operation is cumbersome.

(4) Resistance method.

Advantages: The number of particles can be measured by operating the gradient, the equivalent concept is clear, the speed is fast, and the accuracy is good.

Disadvantage: It is not suitable for measuring particle samples smaller than 0.1um, and it is troublesome to replace the small hole tube for samples with wide particle size distribution.