【摘要】 目的研究不同的喷砂条件对选择性激光熔覆技术(SLM)制作的钴铬合金与瓷结合强度的影响。方法用SLM技术制得63个10 mm×10 mm×2 mm钴铬合金试件块,随机分9组(n=7),采用不同Al2O3粒度(A1=50μm,A2=100μm,A3=150μm)和不同压强(B1=0.2 MPa,B2=0.4 MPa,B3=0.6 MPa)进行喷砂处理。每组随机选取一个试件进行扫描电子显微镜(SEM)观察,其余试件上瓷后用万能测试机测定试件的金瓷结合强度并观察其断裂模式,运用SPSS 17.0软件分析数据。结果 A1B1、A1B2、A1B3、A2B1、A2B2、A2B3、A3B1、A3B2、A3B3组剪切强度分别为(27.22±0.95)、(27.58±0.47)、(26.80±0.71)、(27.54±0.78)、(30.75±0.43)、(26.93±0.88)、(28.18±0.93)、(29.55±0.57)、(28.11±0.91) MPa。不同粒度Al2O3喷砂组间剪切强度的差异有统计学意义(P<0.05),不同压强喷砂组间剪切强度的差异有统计学意义(P<0.05),不同颗粒和不同压强对剪切强度的大小有交互作用(P<0.05)。剪切实验后,全部试件均为混合断裂模式。结论在本实验条件下,SLM钴铬合金在0.4 MPa、100μm的Al2O3颗粒喷砂后,金瓷结合强度最大。更多还原

【Abstract】 Objective To investigate the effect of different sandblasting conditions on the metal-ceramic bonding strength of Co-Cr alloy fabricated by selective laser melting(SLM) technology. Methods A total of 63 specimens of Co-Cr alloy fabricated by SLM were prepared and randomly divided into nine groups(n=7). Each group was treated with different powder particles(A1=50 μm, A2=100 μm, and A3=150 μm) and pressures(B1=0.2 MPa, B2=0.4 MPa, and B3=0.6 MPa) in sandblasting. One sample was randomly selected from each group for microstructure observation by scanning electron microscope(SEM). Ceramic was fired at the center of the specimens. Metal-ceramic bonding strength was measured with universal testing machine. Results were statistically analyzed with SPSS 17.0 software. Results The mean bond strengths were as follows: Group A1 B1: 27.22 MPa±0.95 MPa, Group A1 B2: 27.58 MPa±0.47 MPa, Group A1 B3: 26.80 MPa±0.71 MPa, Group A2 B1: 27.54 MPa±0.78 MPa, Group A2 B2: 30.75 MPa±0.43 MPa, Group A2 B3: 26.93 MPa±0.88 MPa, Group A3 B1: 28.18 MPa±0.93 MPa, Group A3 B2: 29.55 MPa±0.57 MPa, and Group A3 B3: 28.11 MPa±0.91 MPa. The particle factor of Al2 O3 and the pressure factor of blasting showed statistical significance(P<0.05). An interaction was observed between the factors of particle and pressure(P<0.05). Mixed fracture mode of all specimens was observed after the shear strength test. ConclusionIn conclusion, metal-ceramic bonding strength reaches the maximum when specimens are sandblasted with 100 μm alumina oxide at 0.4 MPa pressure.更多还原