Effect of TZP nanoparticles synthesized by RCVD on mechanical properties of ZTA composites sintered by SPS. Issue 8 (July 2022)

• Record Type: Journal Article
• Authors: Li, Qizhong; Chen, Yongfang; Xu, Qingfang; Yang, Meijun; Zhang, Song; Goto, Takashi; Tu, Rong
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 8(2022)
• Page Start: 3550
• Page End: 3558
• Publication Date: 2022-07
• Subjects: Rotary chemical vapor deposition (RCVD) -- TZP nanoparticles -- ZTA nanocomposites -- Spark plasma sintering (SPS); Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.02.043
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Alumina is an engineering ceramic material with excellent comprehensive properties as well as the inherent shortcoming of the low fracture toughness. Y2 O3 -stabilized t-ZrO2 (TZP) is an effective additive to improve its fracture toughness. In this work, rotary chemical vapor deposition (RCVD) was applied to uniformly coat TZP nanoparticles on α-Al2 O3 powder, and then the powder was compacted via spark plasma sintering. The content of TZP increased from 0.56 to 4.7 wt% with increasing the deposition temperature from 500 to 800 °C but decreased at 900 °C. The RCVD-TZP nanoparticles homogeneously surrounded the α-Al2 O3 grains and inhibited its growth after sintering. The relative density, fracture toughness and hardness of the ZTA composites had the maximum values of 99.2%, 7.28 ± 0.33 MPa m 1/2, and 19.5 ± 0.5 GPa at 1500 °C and 4.7 wt% RCVD-TZP, respectively, much higher than the ZTA composites directly mixed with TZP commercial powder.