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In order to obtain carbon-ceramic linear resistor with stable performance, the preparation of high resistance layer glaze slurry used in the manufacturing of carbon-ceramic resistor was studied systematically in this paper. Firstly, the glazing technology of glaze slurry prepared by different binders was compared, then the mixing time and water material ratio of slurry were systematically studied to obtain the influence of mixing time and water material ratio on the viscosity of glaze slurry, and finally the optimal mixing process parameters were determined. The results show that the glaze slurry has good suspension and coating properties when the Zuoyun clay is used as binder. When the mass fraction of Zuoyun clay is 15%, the glaze slurry has good processability and adhesion. The optimum mixing process parameters of high resistance glaze and binder is as below: Zuoyun clay is used as binder, the mass fraction of clay is 15%, the ratio of water and material is 0.6∶1, and the mixing time of ball glaze is 1 h. The breakdown strength of carbon-ceramic resistors coated with high resistance layer is 78% higher than that of the uncoated resistors, and the dispersion is smaller.
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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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