Microstructural evolution of nanocrystalline Al2O3 sintered at a high heating rate

Meng, Fancheng; Fu, Zhengyi; Wang, Weimin; Zhang, Qingjie

doi:10.1016/j.ceramint.2009.09.037

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…On the one hand, they can fill in the defects on the grain surface to reduce the surface energy, inhibiting grain growth [36]. On the other hand, rare-earth ions block the diffusion of other ions along grain boundaries because of their bigger radii [42,43,44] and reduce the grain boundary diffusivity (Figure 4). However, a decreased grain size results in an increased number of grain boundaries.…”

Section: Discussionmentioning

confidence: 99%

Wear Resistance Mechanism of Alumina Ceramics Containing Gd2O3

et al. 2018

Materials

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Excellent wear resistance of alumina ceramics is a desirable quality for many products. The purpose of this work was to improve the wear resistance of 99% alumina ceramics in an Al2O3–Gd2O3–SiO2–CaO–MgO (AGSCM) system. The content of Gd2O3 varied from 0.01% to 1%. A test of wear rate was performed in a ball milling apparatus in a water environment according to the Chinese industry standard. The compositions and microstructure of this material, as well as the effect of bulk density on wear rate, were studied. The effect of Gd2O3 on phases, grain growth mode, and grain boundary cohesion was investigated. It was found that Gd2O3 could refine grain size, form compressive stress of the grain boundary, and promote the crystallization of CaAl12O19. The wear rate of this material was as low as 0.00052‰ (the Chinese industry standard wear rate is ≤0.15‰). The mechanisms for wear resistance of AGSCM ceramics were also determined.

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Section: Discussionmentioning

confidence: 99%

Wear Resistance Mechanism of Alumina Ceramics Containing Gd2O3

et al. 2018

Materials

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“…Although the synthesis of high purity alumina powders has been successfully achieved in a large number of publications, the consolidations of powders to full or nearly full density without appreciable grain growth are still a practical challenge [7]. The conventional sintering techniques, in which, the addition of second phase promotes the sintering of alumina powders by forming liquid phases or solid solution, can apparently not apply to the high purity ceramic [5,8]. To overcome the possibly caused contamination problems, unconventional sintering techniques and methods, such as microwave sintering [9][10][11], hot pressing sintering [12][13][14][15], spark plasma sintering (SPS) [16][17][18] etc have been proposed.…”

Section: Introductionmentioning

confidence: 99%