Hardness and fracture toughness of mullite–zirconia composites obtained by slip casting

Garrido, Liliana B.; Aglietti, E.F.; Martorello, Leandro; Camerucci, M.A.; Cavalieri, A.L.

doi:10.1016/j.msea.2006.01.035

Cited by 49 publications

(29 citation statements)

References 17 publications

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“…A strong increase in the thermal conductivity has been observed between 125°C and 64°C for an alumina feedstock and between 184°C and 154°C for a silicon nitride feedstock. 1,24 The variation in specific heat of the feedstock with temperature is shown in Fig. 5.…”

Section: Resultsmentioning

confidence: 99%

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

Martin

Vick

Enneti

et al. 2013

JOM

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Powder injection molding (PIM) of ceria-stabilized, zirconia-toughened mullite composites were investigated in the present article with the goal of obtaining performance enhancement in complex geometries for energy and transportation applications. A powder-polymer mixture (feedstock) was developed and characterized to determine its suitability for fabricating complex components using the PIM process. Test specimens were injection molded and subsequently debound and sintered. The sintered properties indicated suitable properties for engine component applications used in unmanned aerial vehicles (UAVs). The measured feedstock properties were used in computer simulations to assess the mold-filling behavior for a miniature turbine stator. The results from the measurements of rheological and thermal properties of the feedstock combined with the sintered properties of the ceria-stabilized, zirconia-toughened mullite strongly indicate the potential for enhancing the performance of complex geometries used in demanding operating conditions in UAV engines.

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Section: Resultsmentioning

confidence: 99%

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

Martin

Vick

Enneti

et al. 2013

JOM

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“…Prusty et al [25] obtained a hardness value between 1100 and 1200 Vickers (10.8 and 11.8 GPa) for mullite-zirconia composites processed by plasma fusing of sillimanite and zircon in the presence of magnesia. Garrido et al [26] reported a hardness value of $9 to 12 GPa for mullite-zirconia composites obtained by slip casting.…”

Section: Density and Hardnessmentioning

confidence: 99%

Synthesis and characterization of mullite–zirconia nanostructured composite by combined mechanical activation and reaction sintering

Ashrafi

Emadi

Foroushani

2015

Advanced Powder Technology

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“…The advantages of the indentation method include the small size of the test specimen, the easy specimen preparation and the simplicity of the test [5,6]. It is possible to measure the hardness (H) of the material from the residual impression.…”

Section: Introductionmentioning

confidence: 99%

“…It is possible to measure the hardness (H) of the material from the residual impression. Also, analysis of the cracks emerging from the corners of the impression provides quantitative information on fracture toughness (K IC ) [5,7].…”

Section: Introductionmentioning

confidence: 99%

“…Garrido and co-workers [5] investigated the variation of the H and K IC mechanical parameters as a function of the microstructures of mullite-zirconia composites reaction-sintered from alumina-zircon mixtures from 1450 to 1600 °C under different firing conditions. They found that materials mainly composed by alumina-mullite-zirconia exhibited high hardness and fracture toughness.…”

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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Hardness and fracture toughness of mullite–zirconia composites obtained by slip casting

Cited by 49 publications

References 17 publications

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

Synthesis and characterization of mullite–zirconia nanostructured composite by combined mechanical activation and reaction sintering

Mechanical behavior of mullite-zirconia composites

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