黑刚玉 Black fused alumina
黑刚玉是于电弧炉中，将铝矾土熔炼而制得的一种以a-AL2O3和铁尖晶石为主矿相的灰黑色结晶体，具有韧性高、耐高温、热太性能稳定等特点。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。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。是磨削抛光、喷砂不锈钢制品的最理想产品。
|
规格 |
主要化学成分% | ||
|
Al2O3 |
Fe2O3 |
SiO2 | |
|
一级 |
85 |
9 |
≤6 |
|
二级 |
80 |
10 |
≤10 |
黑刚玉物理性能指标
|
项目 |
指标 |
项目 |
指标 |
|
颜 色 |
黑色 |
最高使用温度（℃） |
1850 |
|
晶形 |
三方晶系 |
真密度（g/cm3） |
≥3. 50 |
|
硬度（莫氏） |
≥9.0 |
线膨胀系数（0—1600℃） |
7—9 |
|
熔点（℃） |
2050 |
|
|
备注：1、产品报价 一级：4180元/吨 含税含运费到天津港 ；二级：3680元/吨 含税含运费到天津港。 2、包装25公斤普通编织袋。3、6-40目属于粗号，40-80目于中细号，80目以上属于细号
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 smelting 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.
|
|
Main Chemical Composition % | ||
|
Al2O3 |
Fe2O3 |
SiO2 | |
|
BA—Ⅰ |
81—85 |
9—11 |
≤8 |
|
BA—Ⅱ |
75—80 |
10—12 |
≤10 |
|
Item |
Indicators |
|
Color |
Black |
|
Crystal |
Trigonal system |
|
Hardness (Mohs) |
≥ 9.0 |
|
Melting point (℃) |
2050 |
|
The maximum temperature (℃) |
1850 |
|
True Density (g/cm3) |
≥ 3. 50 |
|
Linear expansion coefficient (0-1600 ℃) |
7-9 |
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