Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof
An A4B2O9 and niobate technology is applied in the field of ultra-low temperature sintering to prepare nanocrystalline A4B2O9 type niobate ceramics, which can solve the problems of high cost, high prices of tantalate and rare earth elements, reduce thermal conductivity, shorten sintering time, Avoid high porosity effects
Pending Publication Date: 2021-06-11
KUNMING UNIV OF SCI & TECH
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The invention belongs to the technical field of inorganic nonmetal thermal barrier coating materials, and discloses a nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and a preparation method thereof. The structural formula of the ceramic is A4B2O9, A is one or more of Ni, Co, Mg, Ca, Sr, Ba or Zn, B is Nb1-XTaX, and X is larger than or equal to 0.5 and larger than or equal to 0. The preparation method comprises the following steps: respectively carrying out thermal insulation and thermal decomposition on A(OH)2, ACO3, niobium oxalate and tantalum oxalate to obtain AO powder, Nb2O5 powder and Ta2O5 powder; then grinding to obtain a nano-sized powder mixture with high reaction activity; and finally, sintering the mixture powder to obtain the blocky A4B2O9 type niobate ceramic. The preparation method solves the problem that the cost of preparing the thermal barrier coating material is high due to the fact that the raw materials tantalate and rare earth elements used by the existing rare earth tantalate thermal barrier coating material are high in price.
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Property | Measurement | Unit |
Grain size | <= 150.0 | nm |
Average grain size | <= 150.0 | nm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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