Effects of oxidation on surface stresses and mechanical properties of liquid phase pressureless-sintered SiC–AlN–Y2O3 ceramics

Magnani, Giuseppe; Brillante, Aldo; Bilotti, Ivano; Beaulardi, Leandro; Trentini, E.

doi:10.1016/j.msea.2007.11.004

Cited by 12 publications

(5 citation statements)

References 36 publications

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“…Much effort has been aimed at improving the oxidation resistance of ZrB 2 ‐ and HfB 2 ‐based composites focusing on the addition of 20–30 vol% SiC. Compared with liquid B 2 O 3 , borosilicate (BS) glass has higher melting temperature, higher viscosity, and lower oxygen diffusivity, thus providing more effective oxidation protection .…”

Section: Introductionmentioning

confidence: 99%

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics

et al. 2012

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In situ oxidation resistant and solid refractory coatings have been generated on 20 vol% SiC-reinforced ZrB 2 ultra high temperature ceramics containing 10 wt% rare earth (RE) additives such as LaB 6 , La 2 O 3 , and Gd 2 O 3 fabricated by spark plasma sintering. Oxidation for 1 h at 1600°C in static air led to formation of a dense layer (up to 250 lm thick) of ZrO 2 and RE-zirconates on the composite systems underneath which were intermediate layers (50-100 lm) containing heterogeneous crystalline oxides such as La 2 Zr 2 O 7 and amorphous silicate phases. The benefits of predominating solid oxidation products over having substantial volumes of liquid present in aerospace leading edge applications are discussed. II. Experimental DetailsZrB 2 powder (>99%, d 50~4 5 lm, ρ = 6.85 g/cm 3 ; Sigma-Aldrich, Gillingham, U.K.) and SiC powder (a-SiC, 99%, d 50 0.7 lm, ρ = 3.217 g/cm 3 ; Good Fellow Chemicals, Hunting-J. Halloran-contributing editor Manuscript No. 29589.

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Section: Introductionmentioning

confidence: 99%

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics

et al. 2012

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“…It is likely that these grains fill the pores left by gaseous SiO, which is produced by the active oxidation of silicon carbide. In fact, in a previous paper it has already been demonstrated that the active oxidation in SiC-AlN composites shows the first effect at 1300 • C, 16 even if the effects of the passive oxidation of the SiC grains still remain with formation of SiO 2 (see Fig. 1).…”

Section: Microstructure and Composition Of The Coatingmentioning

confidence: 85%

“…Direct consequence of the active oxidation is the formation of the graphite inclusions 16 ; an example of that is reported in Fig. 4 where a graphite inclusion is clearly shown.…”

Section: Microstructure and Composition Of The Coatingmentioning

confidence: 89%

Oxidation resistance of SIC–AlN ceramics coated by oxidation-assisted-pack cementation process

Magnani

Antolini

Beaulardi

et al. 2011

Journal of the European Ceramic Society

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“…Microwave absorbing materials are used in vacuum electronic devices to suppress unwanted electromagnetic modes, prevent self-oscillation, and to provide matched electromagnetic terminations [1][2]. Health issues related to the manufacture and use of BeO-containing materials which are widely used at present have stimulated the recent development of less-hazardous replacement materials [3]. Due to its excellent properties such as high thermal conductivity, high insulation, good heat resistance, good corrosion resistance and non-toxicity, AlN is considered as one of the most promising wide-gap materials.…”

Section: Introductionmentioning

confidence: 99%

“…Howerver, AlN has low strength and weak ability to absorb high-frequency electromagnetic wave, which makes it necessary to add microwave attenuation agent as the second phase [4]. SiC is usually added into AlN matrix as the second phase due to its good high-temperature strength, high thermal conductivity, good heat resistance and good microwave-absorbing ability [3].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermal Properties of Pressureless Sintered AIN/SiC Composites

Zhang

Gong

et al. 2015

KEM

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AlN/SiC composites with 5 wt.% Y2O3addition were fabricated by pressureless sintering at 1700-1950 oC. The influences of sintering temperature and SiC content on the relative density, mechanical property and thermal conductivity were studied. With sintering temperature increasing from 1700 oC to 1750 oC, the relative density increased significantly to about 98.0%, without evident changes from 1750 oC to 1900 oC, and then decreased slightly at 1950 oC. As SiC content increased, the flexural strength of composites sintered at 1750 oC increased firstly, and then decreased, obtaining a maximum flexural strength of 337 MPa at 20 wt.% SiC content. Meanwhile, the thermal conductivity decreased from 60 W/(m∙K) to 40 W/(m∙K) with SiC content increasing from 0 wt.% to 30 wt.%. Moreover, in the sintering temperature range from 1750 oC to 1950 oC, the thermal conductivity increased from 45 W/(m∙K) to 55 W/(m∙K) for AlN-10 wt.% SiC composites, but decreased from 40 W/(m∙K) to 36 W/(m∙K) for AlN-30 wt.% SiC composites.

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Effects of oxidation on surface stresses and mechanical properties of liquid phase pressureless-sintered SiC–AlN–Y2O3 ceramics

Cited by 12 publications

References 36 publications

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics

Oxidation resistance of SIC–AlN ceramics coated by oxidation-assisted-pack cementation process

Preparation and Thermal Properties of Pressureless Sintered AIN/SiC Composites

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Effects of oxidation on surface stresses and mechanical properties of liquid phase pressureless-sintered SiC–AlN–Y2O3 ceramics

Cited by 12 publications

References 36 publications

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB2 Ultra High Temperature Ceramics

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB2 Ultra High Temperature Ceramics

Oxidation resistance of SIC–AlN ceramics coated by oxidation-assisted-pack cementation process

Preparation and Thermal Properties of Pressureless Sintered AIN/SiC Composites

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In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics

In situ Formation of Oxidation Resistant Refractory Coatings on SiC‐Reinforced ZrB₂ Ultra High Temperature Ceramics