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In order to solve the problem of microcracks in the ceramic chips causing failure of the sensor assembly, this article studied and analyzed a simple and non-destructive method for detecting the microcracks in the ceramic chips, which can be filled in the middle of the crack by using the good wettability of alcohol to the ceramic, and the difference between the conductivity of alcohol and air was used to quickly determine whether there were microcracks in the chips by detecting the change of the current of the ceramic chips. This method was applied to the case study of the failure of the front oxygen sensor of a vehicle model. The cause of microcracks was further proved by optical microscopy and high-precision CT. The results show that the alcohol detection method could accurately determine the occurrence of microcracks inside ceramic chips, and the cause of cracks is excessively high heater voltage, and the uneven internal thermal stress, which cause the heater electrode to detach from the chips’ body, which in turn leads to microcracks inside the chips.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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