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研究了结合剂含量对纯钛铸造性能的影响,探讨了自制铸钛包埋料应用于临床的前景。测试了不同结合剂含量的包埋料的抗压强度和热膨胀性能,采用X射线衍射测试包埋料的相结构,采用SEM+EDS对铸件表面反应层组成和成分进行分析。实验结果表明:添加结合剂后包埋料的抗压强度和热膨胀率显著增加,结合剂含量为2.5 wt%时包埋料的抗压强度最高,达到9.91 MPa;此时包埋料的热膨胀率达到1.92%,可有效补偿钛在铸造过程中的固化收缩。X射线衍射结果表明:钛包埋料的主晶相为MgO。SEM和EDS的实验结果显示铸件表面反应层厚度较薄,为20μm。通过调整结合剂的含量,同时提高了氧化镁系包埋料的热膨胀率和抗压强度。本论文所采用的包埋料铸出的钛铸件表面反应层薄,表面较光洁,基本无粘砂,具有一定的临床应用前景。
The effect of binder content on the casting properties of pure titanium was studied, and the prospect of self-made cast titanium-embedded material for clinical applications was discussed. The compressive strength and thermal expansion properties of the embedding materials with different binder content were tested. The phase structure of the embedding material was tested by X-ray diffraction. The composition and composition of the reaction layer on the surface of the casting were analyzed by SEM + EDS. The experimental results show that the compressive strength and thermal expansion coefficient of the embedding material increase significantly when the binder is added, and the compressive strength of the embedding material with the binder content of 2.5 wt% is the highest, reaching 9.91 MPa; at this time, the thermal expansion coefficient Reached 1.92%, which can effectively compensate for titanium in the casting process of curing shrinkage. X-ray diffraction results show that: the main phase of titanium-embedded material is MgO. SEM and EDS experimental results show that the surface of the casting reaction layer thickness is thin, 20μm. By adjusting the content of the binder, the thermal expansion coefficient and the compressive strength of the magnesia-based embedded material are also improved. The titanium castings used in this paper have a thin reaction layer on the surface, a smooth surface and almost no sticky sand, which has a certain clinical application prospect.