Development and charactarization of Ti alloys for dentistry

在钛中添加低于10wt%的铁和Co，合金的维氏显微硬度增加，浇注性降低。与工业纯钛相比，含铁量为10wt%的合金具有较低的耐腐蚀性。这些合金的硬度值与牙科用Co-Cr合金相似。与牙科铸造合金相比，这些合金的可加工性很差。特别是与工业纯钛相比，这些合金的切削加工率较低。期望所研制的钛合金的硬度比商业纯钛高1.5 - 2倍。在钛中加入Cr和Mo后，其硬度约为300 VHN，与牙科铸造金合金的硬度相近或更高。添加Ag的钛合金硬度较低，硬度约为。200 VHN)，比牙科铸造金合金要好。在钛中加入Ag表明了在铸造过程中Ag在铸造机中的汽化现象，表明了对铸造机造成损伤的可能性。在钛中加入Cr和Co，降低了熔敷材料与合金表面的反应性。与工业纯钛相比，所有钛合金的可加工性都较低。然而，与Co-Cr合金相比，这些合金表现出更高的可加工性。

The addition of Fe and Co less than 10wt% in titanium increased Vickers microhardness of the alloys and reduced the value of castability into magnesia based investment. The alloy containing 10wt% Fe showed low corrosion resistance compared with the commercially pure titanium. These alloy indicated the hardness value similar to that of dental Co-Cr alloys. The machaniblity of these alloy were very poor compared to that of dental casting alloys. Especially these alloy demonstrated low rate of machinability compared with the commecially pure titnium. Is is to be desired that the developed titanium alloy shows 1.5 or 2 time greater hardness than commercially pure titanium. The addition of Cr and Mo in titanium showed approximately 300 VHN of hardness and this value is similar or superior to the hardness of dental casting gold alloys. The titanium alloy added with Ag indicated the lower hardness (approx. 200 VHN) than the dental casting gold alloys. The addition of Ag in titanium demaontrated the vaporization of Ag in the casting machine during casting and indicated the possibility of damage for the casting machines. The addition of Cr and Co in titnanium deduced the reactivity between the investment material and the alloy surface. All of the titanium alloy indicated low machinability comapred to the commercially pure titanium. However, these alloy showed greater machinability compared with that of the Co-Cr alloy.