Spark plasma reaction sintering of ZrO2–mullite composites from plasma spheroidized zircon/alumina powders

Khor, K.A.; Yu, Ligen; Li, Y.; Zhao, Dong; Munir, Zuhair A.

doi:10.1016/s0921-5093(02)00151-x

Cited by 37 publications

(24 citation statements)

References 28 publications

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“…Raw kaolin (DD3, from Guelma, Algeria) was used in this investigation, its chemical composition as determined by XRF is reported elsewhere [14][15]. D-Al 2 O 3 powder (MARTOXTD MDS-6) and zirconia containing 3 mol% Y 2 O 3 (3Y-TZP, CRIGERAM) were added to kaolin to obtain 100/00, 92/08, 84/16, 76/24 and 68/32 mullite/ZrO 2 composites (by wt.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Khor el. al [14] prepared mullite-zirconia composites at a relatively low sintering temperature by reaction sintering of plasma spheroidized (PS) zircon-alumina powders in spark plasma sintering (SPS) system. They concluded that with optimized sintering parameters, the combination of PS and SPS was an effective material-processing route for preparing mullite/ZrO 2 composites with attractive mechanical properties from zircon/alumina mixture at a relatively low reaction sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In previous works we synthesised mullite through reaction sintering of Algerian kaolin and Al 2 O 3 [14], and investigated the kinetics of mullite formation from Algerian kaolin [15]. Also, we investigated the effect of MgO [16] and ZrO 2 [17] additions on the structure and sintering behaviour of mullite and mullite-zirconia composites.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behavior of mullite-zirconia composites

Sahnoune

Saheb

2010

EPJ Web of Conferences

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In this work, mechanical properties of mullite-zirconia composites synthesised through reaction sintering of Algerian kaolin, Į-Al 2 O 3 , and ZrO 2 were characterized. Phases present and their transformations were characterized using x-ray diffraction. Hardness H and fracture toughness K IC were measured by Vickers indentation using a Zwick microhardness tester. The flexural strength was measured through three point bending test using an Instron Universal Testing Machine. It was found that the increase of ZrO 2 content (from 0 to 32wt.%) decreased the microhardness of the composites from 14 to 10.8 GPa. However, the increase of ZrO 2 content (from 0 to 24wt.%) increased the flexural strength of the composites from 142 to 390 MPa then decreased it with further increase of ZrO 2 content. Also, the fracture toughness increased from 1.8 to 2.9 MPa.m 1/2 with the increase of ZrO 2 content from 0 to 32 wt.%; and the rate of the increase decreased at higher fractions of ZrO 2 content. The average linear coefficient of thermal expansion (within the range 50 to 1450°C) for samples containing 0 and 16 wt.% ZrO 2 sintered at 1600°C for 2 hours was 4.7 x10 -6 K -1 and 5.2 x 10 -6 K -1respectively.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical behavior of mullite-zirconia composites

Sahnoune

Saheb

2010

EPJ Web of Conferences

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“…However, mullite by itself suffers from low fracture toughness ($2 MPa m 1/2 ) at room temperature and difficulties in sintering to full density [4,5]. In order to improve its fracture toughness and sinterability, other ceramic components such as zirconia, silicon carbide, alumina and etc.…”

Section: Introductionmentioning

confidence: 99%