Test Method for Resistivity of Alumina Ceramic Material
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摘要: 对于绝缘体(电阻率高于109 Ω·m)电阻的精确测试,通常情况下,其所加的电极、电极与所测材料的接触压力、接触面积是影响测试的关键因素。本文利用无压烧结技术制备得到含有一定氧化锰、氧化铬以及氧化硅成分的氧化铝陶瓷,并自制石墨片电极,采用绝缘电阻测试仪测量其电阻。研究发现,石墨电极相对于银电极可以更好地降低接触电阻,且当石墨电极与氧化铝陶瓷之间的接触压力达到19 N,接触面积不小于材料自身面积的63.7 %时,所测电阻率基本保持稳定,即将接触电阻最小化。可以代替银电极,找到了一种可以精确简便测试高阻的方法。Abstract: In testing of the resistance of an insulator (resistivity higher than 109 Ω·m), the electrode added to it and the contact pressure and contact area between the electrode and the measured material are the key factors that affect the test accuracy. In this paper, the pressure-free sintering technique is used to prepare alumina ceramics containing certain manganese oxide, chromium oxide and silicon oxide components, and a self-made graphite sheet electrode is used to measure its resistance with an insulation resistance tester. The study found that the contact resistance with graphite electrodes is lower than that with silver electrodes. It was also found that the measured resistivity is basically stable, that is, the contact resistance is minimised, when the contact pressure between the graphite electrode and the alumina ceramic is not less than 19 N and the contact area is not less than 63.7 % of the material itself. It is concluded that silver electrodes can be replaced by graphite electrodes for accurate and easy testing of high resistance.
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Key words:
- alumina ceramics /
- resistivity /
- graphite electrode /
- contact resistance /
- contact pressure /
- contact area
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表 1 不同化学成分的氧化铝陶瓷
Table 1. Alumina ceramics with different chemical compositions
/% 组别 Al2O3 MnO2 Cr2O3 SiO2 1 100 2 98 1.8 0.2 3 95 4.8 0.2 4 50 50 5 30 70 6 99 1 7 98 2 8 97 3 9 96 4 10 95 5 表 2 石墨电极下绝缘电阻测试仪测量结果
Table 2. Measurement results of the insulation resistance tester with the graphite electrode
/Ω·m 组别 Resistivity 1 1.96E+10 2 1.73E+10 3 5.70E+09 4 1.93E+10 5 4.66E+09 6 1.71E+10 7 4.04E+09 8 9.43E+09 9 2.55E+09 10 1.49E+09 表 3 银电极下绝缘电阻测试仪测量结果
Table 3. Measurement results of the insulation resistance tester with the silver electrode
/Ω·m 组别 Resistivity 6 3.38E+11 7 4.32E+11 8 3.84E+11 9 2.84E+11 10 1.75E+11 -
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