Preparation of fine-grained calcium ?-sialon

Hewett, C; Cheng, Yi‐Bing; Muddle, Barry C.; Trigg, M. B.

doi:10.1007/bf00704517

Cited by 13 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystalline phases, present in each specimen and detected by X-ray diffraction (XRD), are also given in Table I. Previous work on the reaction sequence of a Ca ␣Ј material 14 found gehlenite to be a transient intermediate phase between 1200°and 1400°C, but gehlenite was absent at sintering temperatures >1500°C. In addition, work on the postsintering heat treatment of Ca ␣-SiAlONs found gehlenite to be the major devitrification product in this system for heat treatment temperatures between 1100°and 1500°C.…”

Section: (1) Phase Characterizationmentioning

confidence: 99%

Phase Relationships and Related Microstructural Observations in the Ca‐Si‐Al‐O‐N System

Hewett¹,

Cheng²,

Muddle³

et al. 1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

A systematic set of samples with compositions in the Ca alpha‐SiAlON (α′) system has been fabricated using pressureless sintering to evaluate the phase relationships on, and near, the Ca α′ plane. A phase behavioral diagram for the Ca α′ plane within the Jänecke prism has been determined and found to be similar to those for the Y and Sm α′ systems. However, distinct differences were also observed; two additional regions (α′+ 27R + liquid) and (α′+ 33R + liquid) have been identified. Investigation of the microstructures revealed elongated Ca α′ grains in the samples prepared by pressureless sintering. The aspect ratio of the elongated grains of α′ increased as the concentration of stabilizing cation was increased. Single crystalline phase Ca α′ samples of comparable density to hot‐pressed material were fabricated successfully using pressureless sintering.

show abstract

Section: (1) Phase Characterizationmentioning

confidence: 99%

Phase Relationships and Related Microstructural Observations in the Ca‐Si‐Al‐O‐N System

Hewett¹,

Cheng²,

Muddle³

et al. 1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…T HE a-sialons that are isostructure with a-Si 3 N 4 have the general formula of M x Si 12ÀmÀn Al m1n O x N 16Àn , where M, the stabilizer in a-sialon, is one of the cations Li, Mg, Ca, Y, and most rare earth elements. 1,2 One of the most important advantages of a-sialon is that the amount of intergranular phase liquid phase is reduced by the transient liquid phase being absorbed into the matrix a-sialon phase during sintering, which makes it a good structural ceramic in high temperature application. 3 In recent years, there are several reports 4-7 on fabrications of transparent/translucent sialon ceramics, which widen the application of those materials.…”

Section: Introductionmentioning

confidence: 99%

Translucent Mg‐α‐Sialon Ceramics Prepared by Spark Plasma Sintering

Xiong

Wang

et al. 2007

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The translucent Mg‐α‐sialon ceramics have been prepared by spark plasma sintering (SPS) α‐Si3N4 powder with AlN and MgO as the additives at 1850°C for 5 min. The sample possesses a uniform, dense microstructure under the rapid densification of SPS process. The translucent Mg‐α‐sialon ceramics achieve the maximum transmittance of 66.4% for the sample of 0.5 mm in thickness in the medium infrared region, which could be attributed to the equiaxed microstructure and few glassy phase confirmed by the observation of transmission electron microscopy. The material also exhibits good mechanical properties of high hardness (21.4±0.3 GPa) and fracture toughness (6.1±0.1 MPa·m1/2).

show abstract

“…5 and 6), which is consistent with the result reported in the previous literature. 24 These 27 Al and 29 Si MAS NMR results also strongly indicate the formation of Ca-␣-SiAlON.…”

Section: Resultsmentioning

confidence: 74%