| 摘要 |
A heating device includes a substrate made of a heat-resistant insulating material, a heating resistor formed on the substrate, and a protective glass coating formed on the substrate to cover the heating resistor. The protective glass coating is formed of a glass material containing, as an additive, 3 DIFFERENCE 40 wt % of alumina powder which has an average grain size of 0.5 DIFFERENCE 2.0 mu m.
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