牙科瓷與鎳鉻鉬金屬界面結合性質研究

本研究主要是以鎳鉻鉬生醫金屬與牙科陶瓷燒結成牙科復形體，針對基材經不同預熱溫度處理對界面的顯微結構、結合強度與破裂模式的變化做探討。另外，藉由電漿熔射噴塗的方式噴覆一層遮色瓷和氧化鋯介層，其中改變的參數包括噴覆距離、功率、基材粗糙度與氧化鋯塗層厚度等，期望找出較佳的金屬陶瓷之結合強度，同時也觀察經電漿熔射噴塗所燒結出來的牙科復形體之微結構對結合強度的影響，並比較電漿熔射噴塗與人工塗瓷界面的破裂模式做進一步的整合與探討。實驗結果顯示，Ni-Cr-Mo牙科金屬之預先氧化處理對於結合強度的影響有限，甚至有負面的影響，試片破裂模式主要是破壞在牙科瓷內部的內聚破壞，這也表示金屬與陶瓷間有較好的化學結合。利用電漿熔射噴塗遮色瓷介層的研究顯示，使用功率為45.8 kw、基材粗糙度Ra = 4的試片有較好的結合強度，試片破裂模式為內聚與界面破壞之混合型，比較人工塗瓷，破裂起始有從牙科瓷轉移為界面破壞之傾向。另外，氧化鋯塗層厚度為40 mm有較佳的結合強度，但氧化鋯介層引入對牙科瓷與鎳鉻鉬結合強度仍然有限，其破斷位置為氧化鋯塗層內部，隨著噴塗厚度增加，會由Ni11Zr9的二次相區域作破斷。

關鍵字

牙科瓷；結合強度；電漿熔射噴塗

並列摘要

This research is mainly to Ni-Cr-Mo biometal and porcelain to sinter and form the dental restore, by different preheat temperature process of substrate show interface micro-structure, bonding strength and fracture mechanism of the way make the discussion. In addition, the way spraying an opaque and ZrO2 coating on substrate by plasma spraying. We expect find out better bonding strength by changing the experiment parameters include distance between nozzle and substrate, power, roughness of substrate and thickness of coating. At the same time observe the microstructure of dental restore with bonding strength relationship. Moreover, we compare the fracture mechanism of plasma spray coating and man-made coating for more discussion. The experimental result reveals, Ni-Cr-Mo metal pre-oxidizing is limited to the influence which bonding strength, even have negative influence. The fracture is mainly the cohesive destruction that is destroyed within the porcelain, this shows there is better chemical combination between metal and porcelain; Plasma spraying which the high power for 45.8 kw, roughness of substrate Ra for 4 has superior bonding strength. The fracture is mixing cohesive destruction and adhesive destruction, and position of fracture has the tendency from porcelain to interface. Moreover, the thickness of ZrO2 coating with 40 mm has the best bonging strength, but it still limited for the strength between Ni-Cr-Mo alloy and porcelain. With the increase of spraying thickness, the fracture region transfer to the Ni11Zr9 secondary phase.

並列關鍵字

Porcelain ； Bonding strength ； Plasma spraying

參考文獻

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[5] N. Claussen, “Stress-Induced Transformation of Tetragonal ZrO2 Particles in Ceramic Matrices,”J. Am. Ceram. Soc, 1978, 61, 85.

[6] E. P. Butler, “Transformation-Toughened Zirconia Ceramics”, Mater. Sci. and Tech., 1985, 471.

國際替代計量

牙科瓷與鎳鉻鉬金屬界面結合性質研究

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