反复熔铸影响新旧钴铬烤瓷合金的机械性能  

Mechanical properties of cobalt-chromium alloys containing different proportion of once-used alloys after recasts

作　　者：肖月[1] 任丹丹[2] 王丹[3] 

机构地区：[1]佳木斯大学附属第二医院口腔修复一科,黑龙江省佳木斯市154007 [2]佳木斯大学研究生学院,黑龙江省佳木斯市154007 [3]佳木斯大学附属第二医院口腔疾病预防中心,黑龙江省佳木斯市154007

出　　处：《中国组织工程研究》2013年第42期7396-7401,共6页Chinese Journal of Tissue Engineering Research

摘　　要：背景:目前关于反复铸造后钴铬烤瓷合金机械性能改变的研究已有较多研究报道,而对于将回收旧料再利用于新料中后再铸造钴铬烤瓷合金机械性能的研究则少有报道。目的:研究反复熔铸对不同比例新旧钴铬烤瓷合金拉伸强度、屈服强度、延伸率及显微硬度等机械性能的影响。方法:由新钴铬烤瓷合金熔铸成Ⅰ代铸件,40%Ⅰ代废旧料添加60%新钴铬烤瓷合金熔铸成Ⅱ代铸件,40%Ⅱ代废旧料添加60%新钴铬烤瓷合金熔铸成Ⅲ代铸件,40%Ⅲ代废旧料添加60%新钴铬烤瓷合金熔铸成第Ⅳ代铸件。采用拉伸实验测试各代试件的拉伸强度、0.2%屈服强度、延伸率;采用弯曲实验测试各代试件的弯曲强度;采用硬度实验测试各代试件的维氏硬度值;并进行显微金相观察。结果与结论:Ⅱ,Ⅲ,Ⅳ代铸件拉伸强度、0.2%屈服强度、延伸率、弯曲强度及维氏硬度值与Ⅰ代铸件比较,差异均无显著性意义。Ⅰ代试样晶粒的大小均匀一致,直径较小,沿晶界分布的碳化物大小也较均匀细小,主要呈球形和不规则的蠕虫状两种形态;Ⅱ代和Ⅲ代试样组织形态尚均匀,只是晶粒有些粗化;Ⅳ代试样显微组织中的碳化物开始粗化,不规则蠕虫状的碳化物含量增多,可发现晶粒内存在少量非金属夹杂物。表明新旧比例为3∶2的钴铬烤瓷合金至少可以反复熔铸3次而不引起机械性能下降。BACKGROUND：There are numerous studies about mechanical changes of recast cobalt-chromium ceramic al oys. However, little is reported on the mechanical properties of cobalt-chromium ceramic al oys containing once-used al oys after recasts. OBJECTIVE：To study the effects of different proportion of once-used al oys to recasting cobalt-chromium al oys on their mechanical properties, including tensile strength, yield strength, elongation and hardness. METHODS：Cobalt-chromium al oys cast samples were prepared and recast for three times （40%once-used al oys were added per time）. The tensile strength, 0.2%yield strength, percentage of elongation, flexural strength and Vickers hardness of each specimen were measured. In addition, microscopic metal ographic observation was done. RESULTS AND CONCLUSION：Being recast for three times, cobalt-chromiun al oys showed no significant differences on their tensile strength, 0.2%yield strength, percentage of elongation, flexural strength and Vickers hardness. GenerationⅠal oy samples had uniform size, smal diameter and smal carbide size distributing along the grain boundary, mainly exhibiting spherical and irregular wormlike forms. Generations Ⅱ and Ⅲ samples were uniform in shape, but crystal grains were coarsened a little. Carbide from Generation IV samples began to be coarsened, irregular wormlike carbides were increased in amount, and a few of non-metal ic inclusions could be found in grains. Cobalt-chromium al oys can be recast after addition of 40%once-used al oys for three times at least in air environment, without decrease of the mechanical properties.

关 键 词：生物相容性材料 金属烤瓷合金 拉伸强度 硬度试验 

分 类 号：R318[医药卫生—生物医学工程]