Effect of different sandblasting conditions on the metal-ceramic bonding strength of Co-Cr alloy fabricated by selec-tive laser melting technology

doi:10.7518/hxkq.2018.05.014

Abstract

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 sand-blasting. 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 A1B1: 27.22 MPa±0.95 MPa, Group A1B2: 27.58 MPa±0.47 MPa, Group A1B3: 26.80 MPa±0.71 MPa, Group A2B1:27.54 MPa±0.78 MPa, Group A2B2: 30.75 MPa±0.43 MPa, Group A2B3: 26.93 MPa±0.88 MPa, Group A3B1: 28.18 MPa±0.93 MPa, Group A3B2: 29.55 MPa±0.57 MPa, and Group A3B3: 28.11 MPa±0.91 MPa. The particle factor of Al₂O₃ 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. Conclusion In conclusion, metal-ceramic bonding strength reaches the maximum when specimens are sandblasted with 100 μm alumina oxide at 0.4 MPa pressure.

Key words: selective laser melting, sandblasting, metal-ceramic bonding strength

CLC Number:

R783.2

Qianqian Yu,Jing Guo,Hongshui Zhu. Effect of different sandblasting conditions on the metal-ceramic bonding strength of Co-Cr alloy fabricated by selec-tive laser melting technology[J]. West China Journal of Stomatology, 2018, 36(5): 539-543.

Figures/Tables 4

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变异来源	Ⅲ型平方和	df	均方	F值	Sig
压强	34.333	2	17.116	17.730	0.000
颗粒大小	17.500	2	8.750	9.037	0.001
压强*颗粒	15.782	4	3.946	4.705	0.008