title: Microstructure and mechanical properties of glass-infiltrated Al2O3/ZrO2 nanocomposites.
abstract: This work was to investigate the effect of zirconia nanoparticles content on microstructure and mechanical properties of glass-infiltrated alumina/zirconia composites (AZGs). A series of slip-cast zirconia-toughened alumina (ZTA) compacts containing 10, 20, 30 wt% nano-zirconia, respectively, were partially sintered at 1,250°C for 2 h, then infiltrated with lanthanum borosilicate glass of lower thermal expansion at 1,180°C for 4 h. A porosity ranging from 21 to 25% mainly with submicron pore size was demonstrated in the partially-sintered ZTAs. Homogeneous distribution and micro-crystallization of intergranular glass phase was showed in the AZGs. The mechanical strength and fracture toughness of AZGs increased with zirconia content, the maximum (633.5 ± 41.7, 6.7 ± 0.6 MPa m(0.5)) were obtained in 30 wt% zirconia group, which were significantly higher than those in 10 wt% zirconia group (P < 0.05). The improved mechanical performance of AZGs containing 30 wt% zirconia was attributed to their larger zirconia content as well as thinner intergranular glass film.
authors.affiliation: State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.
authors.forename: Jingchao
authors.initials: J
authors.lastname: Zhang
authors.forename: Yunmao
authors.initials: Y
authors.lastname: Liao
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Zhao
authors.forename: Chaoliang
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000535:Aluminum / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry*; D017609:Barium Compounds / Q000737:chemistry; D003460:Crystallization; D003764:Dental Materials / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D053761:Nanocomposites; D016062:Porosity; D011312:Pressure; D017640:Silicates / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry*
chemical_list: D017609:Barium Compounds; D003764:Dental Materials; D017640:Silicates; D007811:Lanthanum; D015040:Zirconium; D000535:Aluminum; D000537:Aluminum Oxide; C028541:zirconium oxide