The Machinability of Cast Ti-Sn Alloys for Dental Applications

• Main Authors: Huang,Jong-Rong, 黃忠榮
• Other Authors: Ho,Wen-Fu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/91769008484766049556

碩士 === 大葉大學 === 機械與自動化工程學系 === 101 === This study is one of the Bio-Medical Material laboratory research series on Titanium alloy that has superior mechanical and mechinability properties. Microstrucutre, mechanical properties, machinability are observed on a series of Titanium (Ti) – Tin (Sn) alloy test samples produced by a dental cast machine and compared with commercially pure (grade II) Titanium (cp Ti) samples used as control. Sn content of as-cast Ti-Sn samples varied between 1 to 30 wt% (Ti-xSn, x = 1, 5, 10, 20, and 30). Microstructure XRD analysis concludes diffraction peaks of all the Ti-xSn alloy samples matched those for αTi, and no β or other intermediate phase.Hardness of Ti-xSn alloy increases when Sn content increases. Started from the 246HV observed on Ti – 1Sn, hardness value raised to the highest 357HV observed on Ti – 30Sn. After Sn content exceeds 20 wt%, the mechanical property transformed from ductile to brittle. Machinability is evaluated the aveage cutting force and the smooth of the cutting surface. Test samples are machined with Computer Numeric Control (CNC) doctor bed. Under the same tool setting, the cutting force observed increases significantly on the Ti – xSn samples have higher Sn content. The cutting force of alloy under the 110 m/min cutting speed and 30 mm/min feed rate is 8.33N. The cutting surface coarse level of Ti–20Sn is 0.57 nm, the lowest among all samples. From the observed test results of this study, Ti–xSn alloy possess impressive mechanical and machinablility properties. It is reasonable to believe that Ti–xSn alloy could be better choices for dental casting and many other Computer Aided Design /Manufacturing (CAD/M) machining applications. High potential shall be expected.