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인산염계 실리카 매몰재의 성분변화에 따른 티타늄의 주조특성
김광만,은진원,이상배,김경남 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.2
A large increase in the use of titanium in density is driven by the desire to take advantage of titanium's excellent biocompatibility and its high resistance to corrosion. The development of investments suitable for titanium castings is critical because their mechanical properties are greatly affected by the surface-reacted layer. The purposes of this study were to evaluate the characteristics of Titanium Vest Ⅱ(CO) and experimentally produced four phosphate- bonded SiO₂ investments(EA, EB, EC, ED). A great deal of attention was focused on the influence of investments, such as setting time, compressive strength, casting compatibility, casting defects, surface microhardness and interfacial zone of the cast titanium. The following results were obtained; 1. The setting time of all experimental groups were significantly shorter than control group(p<0.05). 2. Experimental groups were significantly greater than control group in compressive strength of 1hr and 2wks(p<0.05) and there was no significant difference among the experimental groups(->0.05). Compressive strength after 2wks was significantly greater than 1hr in all tested groups(p<0.05). 3. EA was showed the highest casting compatibility and CO the lowest. 4. There was no fin in the casting of all groups. There were small porosities in a dental x-ray inspection of EA. 5. CO was showed the highest microhardness at the distance of 50 ㎛ from the surface. 6. The interfacial zone was composed of four layers in all groups. There was irregular and thick layer in CO. According to these results, titanium is castable with experimentally produced phosphate-bonded SiO₂investments. In addition, there is room for further investigation of investment materials to improve the precise casting of titanium.
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