High-temperature oxidation behavior of TiC and TiC + TiB reinforced TB8 matrix composites prepared by spark plasma sintering

This paper aims to research the high-temperature oxidation behavior of TiC/Mo composite. Adding 5 wt.% TiC, Mo-based composite was prepared by Spark Plasma Sintering. The composite was oxidized at different temperatures (400°C, 600°C, 800°C, 1000°C and 1200°C) and times (5 min, 10 min, 20 min, 30 min and 60 min). When oxidation was at 400-1000°C for 20 minutes, the degree of oxidation intensifies with the increase of temperature, and TiO2 was observed at 1000°C. While the temperature was 1200°C, the oxidation rate gradually decreased with the increase of time. The result shows that the formation of TiO2 can inhibit the oxidation process.

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High Temperature Oxidation Behavior of MoSi2 under Low Pressure Atmosphere

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.427 ◽

2007 ◽

Vol 561-565 ◽

pp. 427-430 ◽

Cited By ~ 2

Author(s):

Akira Ibano ◽

Kyosuke Yoshimi ◽

Akira Yamauchi ◽

Rong Tu ◽

Kouichi Maruyama ◽

...

Keyword(s):

High Temperature ◽

High Temperature Oxidation ◽

Oxidation Behavior ◽

Ambient Pressure ◽

Low Pressure ◽

Initial Oxidation ◽

Temperature Oxidation ◽

Plasma Sintering ◽

Spark Plasma ◽

High Temperature Oxidation Behavior

In this study, the high temperature oxidation behavior of polycrystalline MoSi2 in a low-pressure atmosphere was investigated. Polycrystalline MoSi2 was produced by the spark plasma sintering process. Oxidation tests were carried out at 1500°C at either 10Torr or 760Torr in an Ar-20%O2 atmosphere. For both conditions, the weight change peaked at the initial oxidation stage, and then their weights gradually increased with increasing oxidation time. The sample weight became heavier in the ambient pressure than in the low-pressure, but the evaporation oxidation was not significant in the low-pressure condition. After the low-pressure oxidation tests, the formation of Mo5Si3 in the MoSi2 substrate was identified. The oxidation resistance of MoSi2 at 1500°C is discussed based on the obtained results.

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Oxidation Behavior of TiAl Based Alloys Prepared by Spark Plasma Sintering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.940 ◽

2010 ◽

Vol 152-153 ◽

pp. 940-944

Author(s):

Hua Chen ◽

Jing Chao Zhang ◽

X.Y Lu

Keyword(s):

Mechanical Alloying ◽

Spark Plasma Sintering ◽

Oxidation Behavior ◽

Mass Gain ◽

Vacuum Sintering ◽

Temperature Oxidation ◽

Plasma Sintering ◽

Spark Plasma ◽

High Temperature Oxidation Behavior ◽

Fully Lamellar

The spark plasma sintering (SPS) microstructure and high temperature oxidation behavior of TiH2-45Al-0.2Si-5Nb(at.%) alloy were investigated.Emphasis was placed on the effect of SPS microstructures, obtained by blend powder and mechanical alloying powder. The mass gain due to oxidation was measured using an electro balance. The oxide layers as well as its micro-structure were examined by SEM and EDS, and XRD. The results show that sintered microstructure of blend powder is composed of fully lamellar TiAl/ Ti3Al phase, and that of the mechanical alloying powder is composed of finer granular TiAl/Ti3Al phase. The latter oxidation rate is lower, and forms continuous mixed oxide layer of Al2O3 and TiO2. Both SPS microstructure of blend powder and mechanical alloying powder are superior in oxidation behavior to ordinary vacuum sintering.

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