Bonding Property of Porcelain Fused to Co-Cr Dental Alloy

Wu Zhikai; Li Ning

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Bonding Property of Porcelain Fused to Co-Cr Dental Alloy
Vol. 31, Issue 2, Pages: 164-166(2011)
Published： 2011 ，
DOI：

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[1]吴芝凯,李宁.牙科Co-Cr烤瓷合金的金瓷结合性研究[J].特种铸造及有色合金,2011,31(02):164-166+204.

Wu Zhikai, Li Ning. Bonding Property of Porcelain Fused to Co-Cr Dental Alloy. [J]. Special Casting & Nonferrous Alloys 31(2):164-166(2011)
[1]吴芝凯,李宁.牙科Co-Cr烤瓷合金的金瓷结合性研究[J].特种铸造及有色合金,2011,31(02):164-166+204. DOI：

Wu Zhikai, Li Ning. Bonding Property of Porcelain Fused to Co-Cr Dental Alloy. [J]. Special Casting & Nonferrous Alloys 31(2):164-166(2011) DOI：

摘要

通过对牙科Co-Cr烤瓷合金的XRD、SEM和EDS分析、热膨胀系数及金瓷结合强度的测定

研究了合金的成分、热膨胀系数及固态相变对其金瓷结合性的影响。试验测得Co-Cr合金的金瓷结合强度为40.9MPa

高于标准YY0621-2008中要求的25MPa。合金的显微组织由fcc钴的固溶体、hcp钴的固溶体、岛状的金属间化合物及σ相构成。合金与陶瓷的热膨胀系数差为（0.5～0.6）×10-6/℃。烤瓷过程中

合金中fcc相向hcp相的转变以及σ相的析出

降低金瓷匹配性

增大烤瓷修复体的崩瓷、裂瓷率。

Abstract

Effects of constituent

thermal expansion coefficient and solid phase transformation on the bonding property of porcelain fused to Co-Cr dental alloy were analyzed by XRD（X-ray diffraction）

SEM（scanning electron microscope）and EDS（energy dispersive spectrum）

thermal expansion coefficient and bonding strength testing.The results show that the bonding strength of porcelain fused to Co-Cr alloy reaches 40.9 MPa

exceeding the 25 MPa required by the standard of YY 0621-2008.The microstructure of the alloy is composed of fcc Co solid solution and hcp Co solution and insular intermetallic compound as well as σ phase.Thermal expansion coefficient difference of alloy to ceramic is（0.5

.6）×10-6/℃.During firing process

transformation of fcc phase to hcp phase and segregation of acicular σ phase could decrease the compatibility of alloy with ceramic

resulting in the increase of porcelain crack rate and cleft rate.