摘要
目的 :通过对Ti_Zr合金铸流率的研究 ,为Ti_Zr合金临床应用提供合理的铸造参数。方法 :采用网状试样法 ,测量Ti_Zr合金、纯钛及Ti_6Al_4V合金在 3种铸模温度 (室温、30 0℃、6 0 0℃ )下的铸流率。结果 :Ti_Zr合金在室温铸造时其铸流率明显低于纯钛及Ti_6Al_4V合金 ,并且Ti_Zr合金的铸流率也明显低于 30 0℃及 6 0 0℃组。结论 :为保证临床义齿铸造的完整性 ,Ti_Zr合金铸造时铸模温度应在 30
Objective:The aims of this study were to investigate the influence of the mold temperature on the castability of Ti_Zr alloy and find out the reasonable method for casting Ti_Zr alloy in clinic.Methods:Ti_Zr alloy, pure titanium and Ti_6Al_4V alloy were casted respectively, by using a mold made of a zircon (ZrO\-2.SiO\-2) investment and a casting machine (China) designed, with a program of vacuum, pressure and centrifuge casting at three mold temperatures (room temperature, 300℃, 600℃). The castability value was obtained by counting the complete segment of the cast alloy grid. The wax pattern provided a grid with 112 segments. The percentage of complete cast segments was calculated by divided by 112, and multiplied by 100. The mesh castability values of Ti_Zr alloy, pure titanium and Ti_6Al_4V alloy were examined.Results:The castability of three titanium alloys was high when the mold temperature was high. The castability values of Ti_Zr alloy at three mold temperatures were 88.57% for the room temperature, 94.55% for 300℃, and 96.67% for 600℃. Ti_Zr alloy casted at the room temperature showed significantly lower castability value than that casted at 300℃ and 600℃(P<0.05), but no significant difference was found between the castability values of 300℃ and 600℃(P>0.05). The castability values of pure titanium at three mold temperatures were 95.33% for room temperature, 98.70% for 300℃, and 98.90% for 600℃. The castability values of Ti_6Al_4V alloy at three mold temperatures were 95.37% for room temperature, 96.00% for 300℃, and 98.78% for 600℃. When casted at room temperature, the castability values of Ti_Zr alloy were significantly decreased comparing with those of pure titanium and Ti_6Al_4V alloy (P<0.05), but no significant difference was found when cast alloys were casted at 300℃ and 600℃(P>0.05).Conclusion:The mold temperature is one of the major factors influencing cast quality. This study suggests that in order to obtain high castability of dental Ti_Zr alloy castings in clinic, the optimal mold temperature should be higher than 300℃.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2001年第3期178-180,共3页
West China Journal of Stomatology
基金
国家自然科学基金资助项目39770805
