Mechanical Properties of a new Dental all-ceramic Material-zirconia Toughened Nanometer-ceramic Composite  

作　　者：CHAIFeng XULing CHAOYong-lie LIAOYun-mao ZHAOYi-min 

机构地区：[1]DepartmentofProsthodontics,CollegeofStomatology,FourthMilitaryMedicalUniversity,Xi‘an710032 [2]DepartmentofProsthodontics,CollegeofStomatology,SiChuanUniversity,Chengdu

出　　处：《口腔医学研究》2003年第6期483-487,共5页Journal of Oral Science Research

基　　金：国家教育部博士点基金资助项目 (编号 :9845 )

摘　　要：目的 :口腔全瓷修复体以其独特优越性受到医患青睐 ,但脆性问题一直限制其应用范围及使用可靠性。本研究旨在研制用于玻璃渗透全瓷修复的纳米氧化锆增韧陶瓷并全面检测评价其力学性能。方法 :采用化学共沉淀与球磨相结合的方法合成纳米氧化锆增韧陶瓷 (α -Al2 O3 /nZrO2 ceramicspowder ,W) ,扫描电镜评价陶瓷材料的粉体形态特征及粒度分布。预制氧化锆含量不同的陶瓷粉体 (5wt% ,10wt% ,15wt%and 2 0wt% ) ,采用粉浆涂塑技术将材料制成标准试件 ,并在不同温度下 (12 0 0～ 16 0 0℃ )烧结成型 ,用三点弯曲法及单边刀口梁法检测材料试件的抗弯强度和断裂韧性。结果 :1)α -Al2 O3 /nZrO2 材料粉体粒度分布范围大致为 0 .0 2～ 3.0 μm ,其中超细粉体 (低于 0 .1μm)占 2 0 % ;2 )不同烧结温度组试件的力学强度有显著差异 (P <0 .0 5 ) ,14 5 0℃和 16 0 0℃组高于12 0 0℃组 ;3)相同烧结温度下不同氧化锆含量组材料强度有显著差异 ,一定范围内氧化锆含量增高有助于材料的增韧增强。结论 :本研究所研制的纳米氧化锆增韧陶瓷材料组分配比及微观特征能增韧增强材料 。Objectives:All-ceramic dental restorations are attractive to the dental community because of their advantages.But they’re also challenged by relatively low flexural strength and intrinsic poor resistance to fracture.This paper aims to investigate mechanical properties of a new dental all-ceramic material, i.e. zirconia toughened nanometer-ceramic composite (α-Al 2O 3/nZrO 2).Methods:α-Al 2O 3/nZrO 2 ceramics powder (W) was processed with combined methods of chemical co-precipitation method and ball milling. Scanning electron microscopy (SEM)was used to determine the particle size distribution and to characterize the particle morphology of the powders. Four kinds of powders with different ZrO 2 content (5wt%, 10wt%, 15wt% and 20wt%) were prepared by using α-Al 2O 3 powder to dilute the higher ZrO 2 content powder (W). The ceramic matrix compacts were made by slip-casting technique and sintering to 1 200～1 600 ℃. The flexural strength and the fracture toughness of the matrix materials were measured via three-point bending test and single-edge notch beam methods, respectively.Results:1) The particle distribution of the Al 2O 3/nZrO 2 powder ranged from 0.02～ 3.0 μm, with the superfine particles almost accounting for 20%;2) There is a significant difference of flexural strength (P<0.05) between the groups with 1 450 ℃ and 1 600 ℃ sintering temperature and 1 200 ℃;3) There is a significant difference of flexural strength (P<0.05) between different zirconia volume fraction groups with the same sintering temperature, the ceramic matrix samples with higher nZrO 2 (W) content had much better mechanical properties than those of pure α-Al 2O 3 ceramics.Conclusions:The studied nanometer α-Al 2O 3/nZrO 2 powder was homogeously distributed within the matrix and had reasonable powder-size gradation to improve mechanical properties of ceramics.

关 键 词：口腔全瓷修复体 力学性能 烧结温度 纳米陶瓷复合体 氧化锆增韧陶瓷 

分 类 号：R783.1[医药卫生—口腔医学]