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工程科学与技术:2018,50(2):220-225
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激光选区熔覆牙科用钴铬钼合金的金瓷结合性研究
(1.四川大学 制造科学与工程学院, 四川 成都 610065;2.广西医科大学 口腔医学院, 广西 南宁 530021;3.成都科宁达材料有限公司, 四川 成都 610042)
Evaluation of Metal-ceramic Bond Characteristics of Co-Cr-Mo Alloys Fabricated by Selective Laser Melting
(1.School of Manufacturing Sci. and Eng.,Sichuan Univ.,Chengdu 610065,China;2.School of Stomatology,Guangxi Medical Univ.,Nanning 530021,China;3.Chengdu Keningda Materials Co.,Ltd,Chengdu 610042,China)
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投稿时间:2017-09-16    修订日期:2017-12-22
中文摘要: 为解决传统铸造的钴铬钼烤瓷修复体(CAST)在临床应用中存在的崩瓷、瓷剥落等问题,对激光选区熔覆(selective laser melting,SLM)技术制作的牙科钴铬钼合金进行了金瓷结合性研究,以探求SLM技术在临床应用的可行性。使用SLM成型机制备金瓷结合、热膨胀系数试样,以CAST制作的铸造钴铬钼合金为对比,借助金相显微镜、扫描电镜、X射线衍射仪、热膨胀仪等分析测试方法,通过对其显微结构、相组成、热膨胀系数、金瓷结合强度及其结合界面的研究综合评价SLM制作的钴铬钼合金的金瓷结合性。研究结果表明:SLM制作的钴铬钼合金的相组成主要包含FCC结构的α相和HCP结构的ε相,不含针状有害相σ相,且α相的含量达到84%;SLM制作的钴铬钼合金在25~500 ℃的平均线膨胀系数为13.874×10-6/K,低于同类铸造钴铬钼合金试样,金属基体与陶瓷的热匹配性更好;SLM钴铬钼合金的金瓷结合强度为(36.55±1.78)MPa,明显高于铸造合金(P<0.01),且数值稳定性更好;钴铬钼合金与陶瓷的断裂模式是黏附开裂,与结合界面处金属与陶瓷润湿性和内生氧化膜形态有关;SEM分析发现SLM制作的烤瓷件合金与陶瓷的润湿情况较好,无微孔等缺陷,内生氧化膜厚度较厚;CAST制作的铸造烤瓷件合金与陶瓷的润湿性较差,存在微孔等缺陷,内生氧化膜的厚度较薄。通过与CAST制作的铸造钴铬钼合金性能对比发现,SLM制作的钴铬钼合金具有更好的金瓷结合性,这为SLM技术在牙科修复临床应用提供参考。
Abstract:In order to solve the problem of porcelain cracking and peeling of dental Co-Cr-Mo alloys fabricated by traditional cast (CAST) in the clinical application,the metal-ceramic bond properties of Co-Cr-Mo alloys fabricated by selective laser melting (SLM)was studied to explore the feasibility of SLM technology for dental application.Metal-ceramic specimens and thermal expansion coefficient specimens were prepared by SLM machine.Compared with the Co-Cr-Mo alloys made by CAST,the metal-ceramic bond properties of Co-Cr-Mo alloy prepared by SLM were evaluated comprehensively by analyzing the microstructures,phase compositions,thermal expansion coefficient,bonding strength and interface between metal and ceramic,which were obtained with the aid of metallographic microscope,scanning electron microscope,X-ray diffractometer,thermal expansion instrument,and other analytical methods.Experimental results showed that the phase composition of Co-Cr-Mo alloy produced by SLM mainly contains the α phase (84%) with FCC structure,and the ε phase (16%) with HCP structure,and no harmful σ phase.The average linear thermal expansion coefficient in the range of 25~500℃ of Co-Cr-Mo alloy by SLM is 13.874×10-6/K,which is lower than that of the Co-Cr-Mo by CAST and has a better thermal compatibility between the metal matrix and ceramic.The fracture pattern of Co-Cr-Mo alloy between metal and ceramic is adhesion cracking,which is mainly related to the wettability between the metal and ceramic and endogenous oxide film.SEM analysis showed that the wettability between the ceramic and SLM Co-Cr-Mo alloy is great,with no holes and other defects.However,the thickness of the endogenous oxide film of CAST Co-Cr-Mo alloy is thin,with poor wettability and some defects.Compared with the properties of CAST Co-Cr-Mo alloy,it was found that the Co-Cr-Mo alloy by SLM has better metal-ceramic bond properties,which provides reference for clinical application of SLM technology in dental restoration.
文章编号:201700762     中图分类号:TB34    文献标志码:
基金项目:四川省国资委规划资助项目(川国资规划[2015]39号);四川省科技支撑计划资助项目(2015CDDY-S03-DY)
作者简介:周亚男(1992-),男,博士生.研究方向:金属功能材料及其制备技术.E-mail:zhouyanan_0505@163.com
引用文本:
周亚男,魏维,颜家振,李宁,许胜,张幖.激光选区熔覆牙科用钴铬钼合金的金瓷结合性研究[J].工程科学与技术,2018,50(2):220-225.
ZHOU Yanan,WEI Wei,YAN Jiazhen,LI Ning,XU Sheng,ZHANG Biao.Evaluation of Metal-ceramic Bond Characteristics of Co-Cr-Mo Alloys Fabricated by Selective Laser Melting[J].Advanced Engineering Sciences,2018,50(2):220-225.