放电等离子烧结法制备牙科纳米氧化锆复相陶瓷的力学性能研究

目的比较放电等离子烧结（spark plasma sintering,SPS）法与常压炉中高温烧结（atmospheric furnace sintering,AFS）法所得纳米ZrO2复相陶瓷的力学性能。方法对照组将纳米α-Al2O3粉体以第二相填充到基体微米ZrO2造粒粉中,常压炉中AFS法烧结;实验组将纳米ZrO2粉体与纳米α-Al2O3粉体等体积混合,SPS法烧结。测试所制得的纳米ZrO2复相陶瓷的抗弯曲强度和断裂韧性。结果对照组在纳米α-Al2O3粉体填充量占体积分数5%时制得的纳米ZrO2复相陶瓷的抗弯曲强度和断裂韧性最佳,分别为659.2 MPa和8.6 MPa·m1/2。实验组制得的纳米ZrO2复相陶瓷的最佳抗弯曲强度和断裂韧性分别为633.5 MPa和8.3 MPa·m1/2。结论SPS法可以制得抗弯曲强度和断裂韧性与AFS法接近的纳米ZrO2复相陶瓷。

Mechanical properties of dental ZrO2 nanoceramics prepared by spark plasma sintering

Objective To compare the mechanical properties of ZrO2 nanoeeramics obtained by＇ using atmospberic furnace sintering（AFS） and by using spark plasma sintering（SPS）. Methods For the control group, the granulated micrometer ZrO, was taken as the matrix doped with different amounts of the nanometer α-Al2O3 and the generated nanocomposites were sintered by AFS technique in an atmospheric furnace. For the test group, equivoluminal nanometer ZrO2 aud nanometer α-Al2O3 were mixed, continuously treated by SPS. The flexural strength and fracture toughness were tested for both as-generated ZrO, nano-ceramics. Results For tile control group, AFS, the values of flexural strength and fracture toughness tot the nanoceramic composite doped with 5 vol% α-Al2O3 were 659.2 MPa, 8.6 MPa · m1/2 , respectively, and the best values for the nanoceramic composite prepared by SPS individually were 633.5 MPa, 8.3 MPa · m1/2. Conclusion The results for flexural strength and fracture toughness of ZrO2 nanoceramics obtained by using AFS and SPS were quite closed.