Sintering of Fused Mullite Based Particulate Composites Containing Zirconia

Kapuri, Nageswar; N., K.; Upadhyaya, G. S.

doi:10.1080/10426919608947465

Cited by 3 publications

(1 citation statement)

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“…ZrO 2 is reported to accelerate the densification of mullite compacts in regular conventional sintering 44,45 . Rundgren et al 44 showed that sol–gel prepared mullite–zirconia composite with 30 wt% ZrO 2 , and 3 mol% Y 2 O 3 can be sintered to almost 99% of theoretical density at 1550°C for 4 h as compared with pure mullite which showed 97.6% of theoretical density at 1630°C for 4 h in a conventional furnace.…”

Section: Discussionmentioning

confidence: 99%

Densification Study and Mechanical Properties of Microwave-Sintered Mullite and Mullite-Zirconia Composites

Bodhak

Bose

Bandyopadhyay

2010

Journal of the American Ceramic Society

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The objective of this research is to evaluate microwave sintering as a viable technique to reliably process high-strength mullite and mullite-zirconia composites. In this report, the advantage of microwave processing over conventional heating is realized by comparing the densification behavior and mechanical properties of sintered mullite and mullite-zirconia composites. Commercially procured mullite powders were sintered using a 3 kW, 2.45 GHz microwave furnace in the range of 14001-15001C, for 1 h. For pure mullite, an increase in sintering temperature from 14001 to 15001C decreased the porosity from 30% to 13%, which increased the compressive strength from 128718 to 387721 MPa with 1 wt% MgO as a sintering aid to mullite. Furthermore, yttria-stabilized tetragonal zirconia (3Y-TZP) was incorporated (up to 20 wt%) to improve the microwave absorption efficiency of mullite. A maximum density of 92% can be achieved for mullite with 1 wt% MgO and 10 wt% ZrO 2 composites sintered at 15001C in microwave furnace and exhibited a maximum hardness of B10.2470.61 GPa, compressive strength of B740738 MPa and a moderately high indentation fracture toughness of B3.6570.43 MPa . m 1/2 . Microwave sintering data, when compared with those of conventional sintering, revealed that volumetric heating of microwaves led to considerable improvement in strength of mullite and mullite-zirconia composites while utilizing reduced time and energy.

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Section: Discussionmentioning

confidence: 99%