Silicon nitride ceramics with celsian as an additive

Hwang, C. James; Newman, Robert A.

doi:10.1007/bf00355139

Cited by 30 publications

(8 citation statements)

References 12 publications

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“…Polyethylene glycol is macro-molecular compound. Macro-molecular long chains adsorb on grain surface and spread into the solution so as to reduce adsorptive attraction among grains (Hwang and Newman, 1996;Lee et al, 2003). Figure 5 shows that when the sintering temperature is 1750°C, the compact sintering porosity increases with increasing concentrations of nano-Si 3 N 4 .…”

Section: Nano-si 3 N 4 Dispersionmentioning

confidence: 98%

The effect of nano-Si<SUB align=right>3N<SUB align=right>4 on properties of silicon nitride ceramics

Dong

Yang

2010

IJMPT

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Silicon nitride ceramics were fabricated using submicron Si 3 N 4 powder and nano-Si 3 N 4 , adding Al 2 O 3 and Y 2 O 3 by isostatic pressing and SSN. In the paper, the dispersion of nano-Si 3 N 4 powder, the effect of different nano-Si 3 N 4 concentrations on Si 3 N 4 ceramic mechanical properties, application performances and nano-Si 3 N 4 dispersion are discussed. The results demonstrated that the dispersion effect of ethanol was better than water as solvent when PEG was the dispersant agent and the time was 40 min by a supersonic instrument. Flexural strength, hardness and fracture toughness of the specimens were the highest when the content of nano-Si 3 N 4 was 3% by weight.

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Section: Nano-si 3 N 4 Dispersionmentioning

confidence: 98%

The effect of nano-Si<SUB align=right>3N<SUB align=right>4 on properties of silicon nitride ceramics

Dong

Yang

2010

IJMPT

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“…Several authors 19,22 indicated that the ␤-Si 3 N 4 component in the Si 3 N 4 -BAS system was, in fact, a ␤-SiAlON. The amount of aluminum substitution in the ␤-SiAlON in this system could be in the range of 0.76 -4.44 equiv.%, depending on the amount of alumina (Al 2 O 3 ) that was used in the material preparation and processing conditions.…”

Section: January 2001mentioning

confidence: 99%

“…Various methods that have been used previously in monolithic BAS, such as hot pressing and seeding with celsian particles, were ineffective in promoting the formation of celsian. 17,19,21,22 In addition, neither electron diffraction nor X-ray diffraction (XRD) analysis has been effective for detecting the hexacelsian-to-orthorhombic BAS transformation, because only small changes in the O-atom positions within a common framework characterize this transformation. 23 Using high-temperature XRD techniques, Quander et al 21 monitored the phase transformation in a Si 3 N 4 -BAS composite in situ up to 550°C and observed no significant change in the XRD spectrum with the test temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Control of a 70% Silicon Nitride– 30% Barium Aluminum Silicate Self‐Reinforced Composite

Nagarajan

Fang

et al. 2001

Journal of the American Ceramic Society

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The processing response of a 70% silicon nitride-30% barium aluminum silicate (70%-Si 3 N 4 -30%-BAS) ceramic-matrix composite was studied using pressureless sintering, at temperatures ranging from 1740°C, which is below the melting point of BAS, to 1950°C. The relationship between the processing parameters and the microstructural constituents, such as morphology of the ␤-Si 3 N 4 whisker and crystallization of the BAS matrix, was evaluated. The mechanical response of this array of microstructures was characterized for flexural strength, as well as fracture behavior, at test temperatures up to 1300°C. The indentation method was used to estimate the fracture resistance, and R-curves were obtained from modified compact-tension samples of selected microstructures at room temperature.

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“…R ECENT work [1][2][3][4][5][6][7][8] has shown that silicon nitride (Si 3 N 4 ) with 30 vol% of barium aluminum silicate (BaO⅐Al 2 O 3 ⅐2SiO 2 , BAS) can be processed to full density without costly high processingpressure requirements. The as-sintered material exhibited an attractive combination of high strength and some level of damage tolerance, with an average flexural strength of ϳ963 MPa at room temperature, along with a rising R-curve response to the initial crack growth and a critical fracture toughness of K IC ϭ 5.4 MPa⅐m 1/2 .…”

Section: Introductionmentioning

confidence: 99%

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

White

2001

Journal of the American Ceramic Society

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The abnormal grain growth of ␤-Si 3 N 4 was observed in a 70% Si 3 N 4 -30% barium aluminum silicate (70%-Si 3 N 4 -30%-BAS) self-reinforced composite that was pressureless-sintered at 1930°C; Si 3 N 4 starting powders with a wide particle-size distribution were used. The addition of coarse Si 3 N 4 powder encouraged the abnormal growth of ␤-Si 3 N 4 grains, which allowed microstructural modification through control of the content and size distribution of ␤-Si 3 N 4 nuclei. The mechanical response of different microstructures was characterized in terms of flexural strength, as well as indentation fracture resistance, at room temperature. The presence of even a small amount of abnormally grown ␤-Si 3 N 4 grains improved the fracture toughness and minimized the variability in flexural strength.

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Silicon nitride ceramics with celsian as an additive

Cited by 30 publications

References 12 publications

The effect of nano-Si<SUB align=right>3N<SUB align=right>4 on properties of silicon nitride ceramics

The effect of nano-Si<SUB align=right>3N<SUB align=right>4 on properties of silicon nitride ceramics

Microstructural Control of a 70% Silicon Nitride– 30% Barium Aluminum Silicate Self‐Reinforced Composite

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

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