Y2O3를 혼합한 치과용 합금의 미세조직 및 기계적 특성

Abstract

The mechanical properties and corrosion resistance of existing casting alloys are reduced due to defects such as bubbles and coagulation shrinkage during casting, and to compensate for these shortcomings, various attempts have been made to improve mechanical properties, corrosion resistance, and machinability by utilizing powder metallurgy alloying processes. The processing method of dental alloys is changing from analogue methods such as investing, burn-out, casting, devesting to digital methods such as metal milling and 3D printers. Therefore, recognizing the importance of developing dental alloys, specimens based on the composition ratio of three types of dental alloys (implant abutment, PFM, and denture frame) were fabricated by powder metallurgy process to conduct a comparative evaluation of material properties. The mechanical alloying process is a useful method for developing new alloys because it is easier to control microstructure by controlling added elements than casting. The effects of powder metallurgy and reinforcement additions on the mechanical properties of dental metallic materials were reviewed. Based on the dental commercial alloys Ti-6Al-4V, Co-25Cr, and Ni-26Cr alloy chemical compositions, mechanical alloying process was performed by mixing each component powder with Y2O3 powder. The powder was prepared into alloy specimens by uniaxial pressure molding at a 1100 ℃ for 2 hours. The prepared specimens were cut to observe the microstructure, and hardness measurements and tensile tests were performed to compare with commercial materials.