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水鎂石的各種性能介紹

發表時間:2022-01-13

水鎂石呈白、灰白色,當有Fe、Mn混入時呈綠、黃或褐紅色;新鮮面和斷口玻璃光澤,解理面珍珠光澤,纖水鎂石呈絲絹光澤;透明。解理{0001}極完全。硬度2.5。細片具撓性及柔性。相對密度2.3~2.6。具熱電性。塊狀水鎂石白度可達95%。
偏光鏡下:異常干涉色紅棕色代替正常的一級黃或橙色。
力學性能:纖水鎂石的抗拉強度為902MPa,屬中等強度纖維材料。
電磁學性能:纖水鎂石的質量電阻率為8.82?106Ω×g/cm2,體積電阻率為5.9?106Ω×cm,表面電阻率為3.6~4.5?106Ω,電阻率顯各向異性;加熱時電阻率升高。
熱學性能:水鎂石的可靠使用溫度為400℃。纖水鎂石的導熱系數為0.46W/m?K,松散纖維為0.131~0.213W/m?K(體積密度0.47 g/cm3)。
化學性能:纖水鎂石是天然無機纖維中抗堿性最優者。
表面性質:透射電鏡測定的單水鎂石纖維直徑為0.54~0.86μm,最細者0.086μm。

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