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                氧化鋁材料

                測試條件

                單位及符號

                氧化鋁95瓷

                氧化鋁99瓷

                氧化鋁量

                -----

                %

                95

                99

                體積密度

                -----

                g/cm3

                3.7

                3.9

                抗折強度

                -----

                MPa/cm3

                ≥280

                300

                硬度Knoop

                -----

                -----

                2150

                2200

                顯氣孔率

                -----

                %

                ﹤0.27

                ﹤0.10

                熱膨脹系數

                -----

                -----

                5.3

                5.3

                導熱系數

                -----

                -----

                26.7

                27

                線膨脹系數

                20---500℃
                20---800℃

                10-6mm/℃

                6.5~7
                6.5~8

                6.5~7
                6.5~8

                介電常數

                1MHz,20℃ 
                10GHz,20℃

                -----

                9~10

                9~10

                介質損耗角正切值

                1MHz, 20℃ 
                10GHz,20℃

                ×10-4

                ≤4 
                ≤10

                ≤3
                ≤9

                體積電阻

                25℃

                Ω.cm

                8×1014

                8×1014

                擊穿強度

                -----

                Kv/mm

                13

                15

                化學穩定性

                1:9Hcl
                10%NaOH

                mg/cm2

                ≤7
                ≤0.2

                ≤7
                ≤0.2

                zui高使用溫度

                -----

                1700

                1750

                正常使用溫度

                -----

                1650

                1700

                顏色

                -----

                -----

                白色

                近白色