窒化物系セラミックスの歯科鋳造への応用　Ｉ　　金銀パラジウム合金に対するコーティング材としての可能性

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  • Application of nitrides to dental casting. Part 1. Feasibility as coating materials for Au-Ag-Pd alloy.
  • Part 1. Feasibility as Coating Materials for Au-Ag-Pd Alloy
  • 第1報金銀パラジウム合金に対するコーティング材としての可能性

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Nitrides used in this experiment are BN, AIN and Si3N4. First, we studied wettability between nitrides and molten Au-Ag-Pd alloy (composition Au: 12 wt%, Ag: 45 wt%, Cu: 18 wt%, Pd: 20 wt%, Bal.: 5 wt%; melting point: 930°c).<BR>Secondly, we studied feasibility of nitrides as coating materials for wax patterns, that is, Au-Ag-Pd alloy was cast after painting wax patterns with coating material of nitrides. The temperature of mold was 700°C, and an argon arc vacuum-pressure casting machine was used. Surfaces of casted material were investigated using a scanning electron microscope, X-ray diffractometer and surface roughness analyzer.<BR>Results were summarized as follows;<BR>1. The nitrides little wetted molten Au-Ag-Pd alloy.<BR>2. The color of the cast surface coated BN was purple with a dash of red, and this was derived from Cu2O.<BR>3. The dense coating layer of BN inhibited formation of CuO on the cast surface and reduced the surface roughness of the cast.<BR>4. The cast surface coated the nitrides had less clinging than uncoated one, and this indicated that its cleansability was improved.

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