氧化铝是由氢氧化铝高温煅烧而成的白色粉末结晶。氧化铝的结晶形态众多,但结晶稳定且应用最为广泛的为α氧化铝。α氧化铝熔点高、热稳定性好,其硬度排在金刚石、c-BN、B4C、SiC之后。此外,其电绝缘性好,遇酸碱稳定。因而得以广泛应用。我们根据不同的用途,通过控制α结晶粒径的大小及其分布、杂质含量等,生产出多种产品群。
α-氧化铝的特性
矿 物 名 | 刚玉 | ||
结 晶 | 六方晶 a:4.67、c:13.0 ×10-10m | ||
真实比重 | 3.98 | ||
熔 点 | 2053℃ | ||
热传导率 | 36J/m.sec.℃ | ||
比 热 | 750J/kg.℃ | ||
热膨胀系数 | C¦¦ | 6.6X10-6/℃ | |
C丄 | 5.3x10-6/℃ | ||
损耗因子 | 1X10-5 at 103HZ | ||
介电常数 | C¦¦ | 11.5 | at 25℃ 103~1010Hz |
C丄 | 9.3 | ||
耐电压值 | 4.8×105 V/cm | ||
体积电阻率 | 1015Ω/cm | ||
曲折率 | 1.76 | ||
硬度 | 莫氏(新) | 12 | |
维氏 | 2.2×104MPa | ||
杨氏模量 | 4.7×105MPa | ||
抗压强度 | 2940MPa |
α-氧化铝的粒度分布
各种α-氧化铝产品的定位
各种α-氧化铝的用途的烧结特性
α-氧化铝的用途
品种 | 陶瓷 | 耐火材料 | 打磨材料 | 其他 | |||||||||||||||||||||||
实验室陶瓷 | 耐磨损陶瓷 | 匣钵 | 绝缘子 | 火花塞 | 电子部件 | 陶瓷工具 | IC基板及封装 | 半导体设备部件及夹具 | 催化剂载体 | 陶瓷过滤器 | 电熔氧化铝 | 烧结氧化铝 | 合成尖晶石 | 定形耐火材料 | 不定形耐火材料 | 陶瓷纤维 | 硬质材料研磨 | 软质材料研磨 | 精密研磨 | 玻璃原料 | 焊接棒 | 敷粉及脱模剂 | 催化剂 | 发热用树脂填充剂 | 涂料及颜料 | ||
标准 | A-12 |
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粗粒 | A-12C |
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细粒 | A-42 |
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微粒 | A-43 |
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低碱 | AL-13 | ◎ | ◎ |
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AL-43 | ○ | ○ |
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AL-47 | ○ |
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易烧结性 | AL-160SG | ○ | ◎ |
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AL-170 |
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圆形 | AS系列 |
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