Low-temperature synthesis of ZrC powder by cyclic reaction of Mg in ZrO[sub 2]-Mg-CH[sub 4]

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb07785.x· OSTI ID:6033662

Kobayashi, Hidehiko; Shimosaka, Kenichi; Saitoh, Miki; Mitamura, Takashi ^[1]

---

1. Saitama Univ., Urawa (Japan). Dept. of Applied Chemistry, Faculty of Engineering

The authors investigated the conditions for low-temperature synthesis of ZrC fine powder from ZrO[sub 2]-Mg-CH[sub 4]. The synthesis utilizes a thermite-type reaction, with Mg as the reducing agent, and a reaction between Mg and CH[sub 4] gas as a carbon source. The Mg/ZrO[sub 2] molar ratio as well as the heating rate were varied. Because C can be continuously fed into the reaction group by the cyclic reaction of Mg through the formation and decomposition of Mg[sub 2]C[sub 3] (2Mg + 3CH[sub 4] [r arrow] Mg[sub 2]C[sub 3] + 6H[sub 2] [r arrow] 2Mg + 3C), a molar ratio of 2.2 for Mg/ZrO[sub 2] was sufficient for the synthesis of single-phase ZrC. ZrC powders were synthesized under the following conditions: Mg/ZrO[sub 2] molar ratio = 2.2, heating rate = 20 C/min, and temperature maintained at 750 C for 30 min. The amount of reaction heat produced in the reduction reaction of ZrO[sub 2] by Mg depended on the Mg/ZrO[sub 2] molar ratio, specifically, the amount of ZrO[sub 2] contained. Moreover, the cyclic reaction of Mg-Mg[sub 2]C[sub 3]-Mg was influenced by the amount of reaction heat described above and by the heating rate. The ZrC fine powder showed little aggregation and high dispersibility.

• OSTI ID: 6033662
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:9; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MAGNESIUM
CHEMICAL REACTIONS
METHANE
ZIRCONIUM CARBIDES
FABRICATION
ZIRCONIUM OXIDES
POWDERS
ALKALINE EARTH METALS
ALKANES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
ELEMENTS
HYDROCARBONS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
400201 - Chemical & Physicochemical Properties