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黑刚玉:又称低铝刚玉。是于电炉中,将铝矾土熔炼而制得的一种以α- Al2O3和铁尖晶石为主矿相的灰黑色结晶体。
特点:α- Al2O3含量较低,并有一定的Fe2O3(10%左右)存在,因而具有硬度适中、韧性高、耐高温、热态性能稳定。
本公司黑刚玉黑刚玉磨料基本粒集中,切削力强,韧性大,刚柔相济,耐磨性好,工效高。
使用范围:多用于自由研磨,如制品电镀前的打磨工粗磨。
主要用于不锈钢,金属制品,光学玻璃,竹木制品的抛光和喷砂,又是制造树脂砂轮,切割片,纱布的新颖磨料。
规格 |
主要化学成分% |
||
Al2O3 |
Fe2O3 |
SiO2 |
|
一级 |
85 |
9 |
≤6 |
二级 |
80 |
10 |
≤10 |
Black corundum
Black corundum is also known as low aluminum corundum. It is also a new type product of polishing material, and it is a dark gray crystal body made α-Al2O3 and ferropicotite as main ore in the electric arc furnace by ***elting the bauxite. It has characteristics of moderate hardness, high toughness, high temperature resistance, and stable thermal stability. It is mainly suitable for free grinding, such as coarse grinding before electroplating products, mainly for polishing and sandblasting of stainless steel, fabricated metal products.
黑刚玉物理性能指标: |
|
项目 |
指标 |
颜 色 |
黑色 |
晶形 |
三方晶系 |
硬度(莫氏) |
≥9.0 |
熔点(℃) |
2050 |
***高使用温度(℃) |
1850 |
真密度(g/cm3) |
≥3. 50 |
线膨胀系数(0—1600℃) |
7-9 |