When it comes to abrasives, everyone will think of which abrasives have high hardness, and the range that each abrasive is suitable for. Relatively speaking, everyone has come into contact with more finished products, but they don’t know much about the raw materials. What is the difference between white fused alumina, brown fused alumina and red fused alumina?

Detailed introduction of white fused alumina:

1. What is white fused alumina?

white fused alumina is made from industrial alumina powder, smelted at a high temperature of more than 2000 degrees in an electric arc, and then cooled. It is crushed and shaped, and iron is removed by magnetic separation. shape.

What is white fused alumina

2. Characteristics of white fused alumina

white fused alumina is refined and crystallized by electric melting, with high purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance and stable thermal performance. The hardness of white fused alumina is slightly higher than that of brown fused alumina, with slightly lower toughness, high purity, good self-sharpening, strong grinding ability, low heat generation, high efficiency, acid and alkali corrosion resistance, and high temperature and thermal stability.

3. The scope of application of white fused alumina

white fused alumina is suitable for the manufacture of ceramics, resin-consolidated abrasive tools, as well as grinding, polishing, sandblasting, precision casting (corundum for precision casting), etc. It can also be used to manufacture high-grade refractory materials. It is suitable for surface beautification treatment of various high-end products, crafts or hardware. After sandblasting, the surface is white without any impurities, eliminating the trouble of cleaning. Fine white fused alumina can be used as the first for polishing and grinding.

brown fused alumina detailed introduction:

1. What is brown fused alumina?

brown fused alumina, also commonly known as emery, is a brown artificial corundum made by melting and reducing three raw materials: bauxite, carbon material and iron filings in an electric furnace, hence the name. The main chemical composition of brown fused alumina is Al2O3, with a content of 94.5%-97%, and a small amount of Fe, Si, Ti, etc.

What is brown fused alumina

2. The characteristics of brown fused alumina

In the application process, it has the characteristics of non-explosion, non-powdering, and non-cracking, especially its cost performance is much higher than that of traditional brown fused alumina, making it an aggregate and filler of brown fused alumina-based refractories.

3. The scope of application of brown fused alumina

brown fused alumina grain size sand is artificially selected brown fused alumina blocks, processed by roller, ball mill, Barmac and other equipment. The grain size is F8-F325. It is mainly used for polishing, grinding, industrial grinding, etc., and can also be customized according to customer requirements Processing methods such as washing, pickling, etc. can meet the different needs of customers.

red fused alumina detailed introduction:

1. What is red fused alumina?

The composition of red fused alumina is mainly α-alumina, also called chromium corundum and ruby. Nowadays, artificial red fused alumina is mostly on the market.

2. The characteristics of red fused alumina:

The red fused alumina adds 22% chromium to the white fused alumina, and is made by smelting in an electric arc furnace. The color is purple-red. The hardness is slightly higher than brown fused alumina, similar to white fused alumina, and the microhardness can be 2200-2300Kg/mm2. Toughness is higher than white fused alumina and slightly lower than brown fused alumina.

3. The scope of application of red fused alumina

Abrasives made with it are suitable for grinding high-carbon steel, high-speed steel and its thin-walled parts. The abrasives can also be used as grinding, polishing materials, precision casting sand, spraying materials, chemical catalyst carriers, special ceramics, advanced refractory materials, etc.

Compare it in general:

Mainly from the perspective of hardness and toughness:

Hardness: white fused alumina>red fused alumina>brown fused alumina;

Toughness: brown fused alumina>red fused alumina>white fused alumina.

In addition to its high hardness, white fused alumina will not bring color into it during grinding. It is especially suitable for grinding some metal products with higher requirements.

brown fused alumina is the most common corundum series abrasive sand. red fused alumina is somewhere in between.