氧化鋯表面藉由氮化矽處理以改善氧化鋯與熱壓陶瓷的結合

本實驗試圖利用氧化矽塗層的方式對氧化鋯做表面處理，探討氮化矽溶液濃度和浸泡時間對於氧化鋯表面的微結構，以及氧化鋯與貼面瓷鍵結強度之影響。實驗組是將氧化鋯試片浸泡於0.6wt％和3w％氮化矽的4M氫氧化鈉溶液裡，分別浸泡5、7和10天後再進行加熱處理。利用SEM、EDS和X-Ray觀察分析氧化鋯表面的塗層結構及組成，測試氧化鋯表面的接觸角和粗糙度。以萬能試驗機測試氧化鋯與熱壓鑄瓷的剪切強度，並計算氧化鋯表面的貼面陶瓷殘留量，評估破斷模式。實驗結果顯示SEM觀察到經塗覆熱處理後的氧化鋯表面結構與對照組不同，EDS發現表面有Si元素存在。結果顯示各實驗組試片的表面粗糙度(Ra)在0.14 - 0.24μm沒有統計差異，經3wt％氮化矽5天的試片的接觸角最小，與對照組有統計差異。經二種氮化矽濃度浸泡10天處理的氧化鋯試片的剪切強度值顯著高於其它實驗組，經氮化矽塗層處理後的試片破斷模式與對照組的黏著破壞不同，主要為混合破壞。本研究結果證實以浸泡二種氮化矽濃度10天進行氧化鋯表面塗層處理的方法，可以改變氧化鋯表面的微結構，對改善氧化鋯與貼面瓷間的結合強度有顯著的效果。

This study tried to use zirconia surface treatment by the silicon nitride coating method and investigate the effect of the content of Si3N4 and soaking time on zirconia surface microstructure, and bond strength between zirconia and porcelain. In the experimental groups, the zirconia specimens were soaked in 4M sodium hydroxide solution bath with 0.6wt% and 3wt% Si3N4 additive for 5, 7 and 10 days, respectively. And then specimens were heat treated. The coating structure and composition of zirconia surface were observed and analyzed by SEM, EDS and X-Ray The contact angle and surface roughness of zirconia specimens were tested. The shear strength between zirconia and veneer ceramics was tested by universal testing machine. The residual veneer ceramics on zirconia surface were observed and calculated to evaluate fracture modes. The structure of zirconia surface after heat treatment was different from control group, there was Si element on zirconia surface. The results showed that the surface roughness (Ra) of zirconia specimens was range of 0.14-0.24 μm. The contact angle of the specimen soaked with 3wt% Si3N4 content for 5 days was the smallest. The shear strength of zirconia specimens treated with two kinds of Si3N4 contents for 10 days were significantly higher than those of other experimental groups. The failure modes of the zirconia specimens treated by Si3N4 coating were mainly mixed failure. The results suggested that the microstructures of zirconia surface could be changed by soaking two kinds of Si3N4 contents for 10 days to improve bond strength between zirconia and hot pressed ceramics.