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- Title
Wollastonite Ceramic from Chalk and Diatomite for Refractory Heat Insulation.
- Authors
Rodin, A. I.; Ermakov, A. A.; Kyashkin, V. M.; Rodina, N. G.; Erofeev, V. T.
- Abstract
Wollastonite ceramic was obtained from chalk and diatomite by solid-phase synthesis of the components. The influence of the batch composition, regimes of mechanochemical activation, and thermophysical properties of the ceramic materials were investigated. As a result of the combined mechanochemical activation of the batch components (chalk + diatomite), the temperature of the solid-phase synthesis of wollastonite ceramic was lowered to 900°C. After 2-h firing, the mineral wollastonite comprised almost 90% of the ceramic samples. The compressive strength of the samples is 22 – 23 MPa at an apparent density of 1270 – 1300 kg/m3. The material has a stable linear thermal expansion coefficient (CLTE) not exceeding 7.76 × 10 –6 K–1. It can operate at temperatures up to 1100°C inclusively. Samples of heat-insulating material with an average density of 435 kg/m3, compressive strength 2.2 MPa, coefficient of thermal conductivity 0.099 W/(m ∙ K) and limiting operating temperature up to 1050°C inclusive were obtained from the developed batch and expanded perlite. The developed materials can be used as refractory heat insulation for industrial furnaces, equipment, and elsewhere.
- Subjects
THERMAL insulation; DIATOMACEOUS earth; WOLLASTONITE; CHALK; CERAMIC materials
- Publication
Glass & Ceramics, 2022, Vol 79, Issue 7/8, p267
- ISSN
0361-7610
- Publication type
Article
- DOI
10.1007/s10717-022-00498-x