| Microstructure, Mechanical and Thermal Insulation
Properties of Potassium Hexatitanate Whiskers Thermal
Insulation Materials |
Hao Liu,* Wenyuan Liu, Zhoufu Wang, Yan Ma and Xitang Wang
Pages : 1-6
DOI : 10.1080/0371750X.2022.2028267 |
| Abstract |
| Potassium hexatitanate whiskers (PTW) materials have attracted much attention in
thermal insulation fields. Nevertheless, the low mechanical properties limited the
development and application of PTW thermal insulation materials. In this work, low
density, high mechanical properties and high thermal insulation capacity of PTW
thermal insulation materials can be obtained through mesocarbon microbeads (MCMB)
adopted as pore-forming agent. The pyrolysis and oxidation of MCMB promoted the
development of whiskers during the calcination process, rendering the increased
materials porosity. The as-prepared PTW materials heat treated at 1000oC possessed
low thermal conductivity of 0.043-0.035 W.m–1.K–1 from room temperature to 900oC
and a low bulk density of 0.52 g.cm–3. Owing to the point of contact between whiskers
with developed diameter and aspect ratio, comperssive strength of PTW materials
heat treated at 900o and 1000oC was 1.92 and 2.51 MPa, respectively, maintaining high
resilience rates of above 70% at 5% compressive strain. The elevated heat-treatment
temperature (above 1100oC) led to the sintering between whiskers and the resultant
enhanced compressive strength of higher than 4.23 MPa. The researched low density,
high mechanical properties and thermal insulation PTW materials exhibit huge
prospects as insulation linings in thermal insulation fields.
[Keywords: Potassium hexatitanate whiskers, Thermal insulation materials,
Mechanical properties] |
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