Effect of yttria on mechanical and microstructural properties of reaction sintered mullite-zirconia composites

Das, Kaberi; Mukherjee, B; Banerjee, Goutam

doi:10.1016/s0955-2219(98)00095-8

Cited by 30 publications

(16 citation statements)

References 11 publications

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“…Generally, the largest toughness increases seen in mullite are by addition of various zirconia‐based additives with multiple toughness values around 5 MPa m 1/2 . The presence of additives such as yttria gives an advantage in terms of processing, although zirconia itself lowers the temperature needed to sinter mullite without pressure . Both composites with addition of stabilized and unstabilized zirconia have given increased toughness at ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature fracture toughness of mullite with monoclinic zirconia

et al. 2017

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Reactive sintering of zircon and alumina and zirconia additions to mullite are well-established methods for improving the poor fracture toughness of mullite.While it is clear that transformation toughening is responsible for the improved toughness by addition of partially stabilized zirconia, it is not clear why adding unstabilized zirconia increases the toughness although microcracking and crack deflection have been suggested. Therefore, the fracture toughness of a mullite composite with 20 vol% unstabilized zirconia and a monolithic mullite were investigated at ambient conditions and at temperatures up to 1225°C. It was found that monoclinic zirconia increases the toughness at ambient conditions from the monolithic mullite value of 1.9 to 3.9 MPaÁm 1/2 . The toughness of the composite with zirconia remains relatively constant from ambient to 600°C but then decreases rapidly. The mechanism for the toughness enhancement as well as the reason for its variation with temperature are explained using changes in residual stress state as deduced using the sphere in shell model from the measured thermal expansion behavior.

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Section: Introductionmentioning

confidence: 99%

High‐temperature fracture toughness of mullite with monoclinic zirconia

et al. 2017

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“…Ebadzadeh and Ghasemi prepared zirconia–mullite composites using α‐alumina and aluminum nitrate and zircon powder with titania as additive. Das et al . synthesized mullite–zirconia composites containing yttria as additive from Indian coastal zircon flour and calcined alumina.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Role of MgO and CaO Additives on the Microstructures of Reaction‐Sintered Zirconia–Mullite Composite

Chandra¹,

Das

Maitra³

2014

Int J Applied Ceramic Tech

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Isostatically pressed dense reaction‐sintered zirconia–mullite composites were prepared from zircon flour and reactive alumina with different proportions of MgO and CaO additives. The pressed compacts were sintered at elevated temperatures with variable soaking times. Development of different phases and microstructures of the sintered compacts were analyzed to assess the relative influence of the additives on the formation of the zirconia–mullite.

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“…Similarly, it has the same structure in the multicomponent germanate glasses. When introducing proper quantities of Y 2 O 3 , Y 3z replaces Al 3z ions of the glass network structure 31 and strengthens the network structure of the glasses. The other is the network reorganisation effect caused by Y 2 O 3 .…”

Section: Discussionmentioning

confidence: 99%

Structure and property of multicomponent germanate glass containing Y₂O₃

Xiao

Zuo

2009

Advances in Applied Ceramics

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glasses doped with 0?00-16?67 wt-% Y 2 O 3 have been prepared by conventional melt quenching method. The influence of Y 2 O 3 addition on the properties and structure of the glasses has been investigated. The results show that, with the introducing of Y 2 O 3 , the density, glass transition temperature and thermal expansion coefficient of the glass increase but the chemical durability declines. In addition, compared with the glass without Y 2 O 3 , the bend strength of the glass including 4?76 wt-% Y 2 O 3 increased from 54 to 110 Mpa. The possible mechanism is that yttria acts as a network former in the structure and makes the island shape network unit repolymerisation by forming Ge-O-Y bond. The absorption strength caused by hydroxyl vibration decreased up to completely disappearance as the Y 2 O 3 content increased continuously. The introducing of yttria in the composition causes the conversion from four coordination to higher coordination germanium, which decreases non-bridge oxygen (NBO) and weakens hydroxyl characteristic absorption.

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Effect of yttria on mechanical and microstructural properties of reaction sintered mullite-zirconia composites

Cited by 30 publications

References 11 publications

High‐temperature fracture toughness of mullite with monoclinic zirconia

High‐temperature fracture toughness of mullite with monoclinic zirconia

Comparison of the Role of MgO and CaO Additives on the Microstructures of Reaction‐Sintered Zirconia–Mullite Composite

Structure and property of multicomponent germanate glass containing Y₂O₃

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Effect of yttria on mechanical and microstructural properties of reaction sintered mullite-zirconia composites

Cited by 30 publications

References 11 publications

High‐temperature fracture toughness of mullite with monoclinic zirconia

High‐temperature fracture toughness of mullite with monoclinic zirconia

Comparison of the Role of MgO and CaO Additives on the Microstructures of Reaction‐Sintered Zirconia–Mullite Composite

Structure and property of multicomponent germanate glass containing Y2O3

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Structure and property of multicomponent germanate glass containing Y₂O₃