The Basic research on denture of metal plate manufacture using powder metallurgy

目的粉末冶金是一门金属加工技术。粉末制备的多孔钛用途广泛。它适用于钛，因为钛在熔点下烧结，不容易铸造。当它被用于牙科假体时，应用于生物相容性高熔合金属成为可能。然后，对烧结制备的钛片进行了力学性能测试，并讨论了其在义齿制造中的应用。方法在球形钛粉中加入黏结剂，采用医生刀法制备1mm厚的钛片。烧结温度为900 ~ 1150℃，烧结温度为6种。通过尺寸变化率、硬度测试、抗弯强度、抗拉强度和扫描电镜观察对烧结坯进行了评价。在耐火铸件上又烧结了一个致密体。结果与结论随着烧结温度的升高，材料的机械强度显著提高。此外，通过添加粉碎粉和脱胶工艺，获得了优异的机械强度。在耐火铸件的烧结中，实际应用需要预焙100分钟以上，烧结1050℃以上。将烧结钛材料应用于口腔修复具有一定的可行性。但是，今后也有必要对烧结坯的收缩控制进行研究。

PurposePowder metallurgy is a metal processing technology. The porous titanium produced from powder is widely used. It is applied to titanium, which is not easy to cast as it sinters under melting point. When it was used in prosthetic dentistry, application to high fusing metal that is biocompatible becomes possible. Then, the examination of mechanical characters of the Ti sheet produced by sintering was carried out and the application to dental prosthesis manufacture were discussed.MethodTi sheets of 1mm thickness which were added the binder to the spherical Ti powder was produced with the doctor blade method. The sintering was carried out between 900〜1150℃ at 6 kinds of temperatures. The sintered compact was evaluated by dimensional change rate, hardness test, bending strength, tensile strength and SEM observation. Another compact was sintered on the refractory cast.Results and ConclusionMechanical strengths significantly increased with the sintering temperature. In addition, excellent mechanical strengths was acquired by adding crushed powder and de-binder process. And, in the sintering on the refractory cast, pre-baking over 100 minutes and sintering over 1050℃ was needed for practical application. It seemed possible to apply the sintered titanium to dental prosthesis. However, it will be necessary to examine the control of the shrinkage of the sintered compact in the future too.