Mechanical Properties of Pure Titanium Castings

对用该实验铸造机铸造的钛及钛合金铸件进行了研究。本实验中使用的钛锭是低O型的。JIS I型、JIS II型和高氧型，它们具有不同的氧浓度，以及两种Ti-Co合金。制作了直径为3.2mm、长度为20 mm的圆柱形铸件，并进行了显微维氏硬度测试和金相组织观察。用直径为2 mm、长为40 mm的圆柱形金属丝铸件测定了抗拉强度、屈服强度和延伸率，低O型铸件的力学性能与ADA金合金Ⅱ型相当，高O型铸件的力学性能与ADA金合金Ⅳ型相当。Ti-1wt%Co和Ti-3wt%Co铸件的力学性能与高氧型铸件基本相同。Ti-3Co铸件的抗拉强度高于Ti-1Co铸件。Ti-3Co铸件的延伸率低于Ti-1Co铸件的延伸率，表明钛及其合金铸锭可用于制作嵌体、冠、桥、种植体和义齿支架等。

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.