Mechanical Properties of Pure Titanium Castings

研究了用实验铸造机铸造钛及其合金铸件。本实验使用的钛锭为低o型。JIS I型，JIS II型和高o型，它们具有不同的氧浓度，以及两种Ti-Co合金。制作了直径3.2mm、长20mm的圆柱形铸件，进行了显微维氏硬度测定和金相组织观察。采用直径2mm、长度40mm的圆柱形线状铸件进行抗拉强度、抗应力和伸长率的测定。低o型铸件的力学性能与ADA金合金II型基本相当，高o型铸件的力学性能与ADA金合金IV型基本相当，Ti-1wt%Co和Ti-3wt%Co铸件的力学性能与高o型基本相同。Ti-3Co合金的抗拉强度高于Ti-1Co合金。Ti-3Co合金的伸长率低于Ti-1Co合金。结论是，测试的钛及其合金锭可用于建造嵌体、冠、桥、种植体和义齿框架等。

Titanium and its alloy castings made by using the experimental casting machine were studied. The titanium ingots used in this experiment were low-O-type. JIS type I, JIS type II and high-O-type, which have different oxygen concentration, and two kinds of Ti-Co alloys. The cylindrical castings 3.2mm in diameter and 20mm in length were made and used for Micro-Vickers hardness measurment and observation of metallurgical structure. The cylindrical wiry castings 2mm in diameter and 40mm in length were used for measuring tensile strength, proof stress and elongation values.The mechanical properties of the low-O-type castings were almost equivalent to those of ADA gold alloy type II and also those of the high-O-type were almost equivalent to ADA gold alloy type IV. The mechanical properties of Ti-1wt%Co castings and Ti-3wt%Co castings were almost the same as those of the high-O-type. Higher tensile strength were observed on the Ti-3Co castings than that of the Ti-1Co castings. The elongation values observed on the Ti-3Co castings were lower than that of the Ti-1Co castings.The conclusion was that the tested titanium and its alloys ingots were useful for the construction of inlays, crowns, bridges, dental implants and denture frames, atc.