Multiphase-composition tantalum/niobate composite ceramic and preparation method thereof

A technology of composite ceramics and multi-phase composition, applied in the field of materials science and engineering, can solve the problems of inability to prepare composite ceramics, poor mechanical properties of single-phase tantalum/niobate ceramics, etc., to achieve excessive growth of grains and excellent mechanical properties Performance, effect of preventing crack growth

Active Publication Date: 2021-09-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-phase composition of tantalum / niobate composite ceramics and its preparation method to solve the problem of single-phase tantalum prepared by solid-phase high-temperature sintering / Problems of poor mechanical properties of niobate ceramics and inability to prepare composite ceramics

Method used

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  • Multiphase-composition tantalum/niobate composite ceramic and preparation method thereof
  • Multiphase-composition tantalum/niobate composite ceramic and preparation method thereof
  • Multiphase-composition tantalum/niobate composite ceramic and preparation method thereof

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Effect test

Embodiment 1

[0030] (1) Co(OH) 2, niobium oxalate and tantalum oxalate are placed in an alumina crucible and then calcined and decomposed in a medium temperature furnace. Co(OH) 2 The calcination temperature is 460°C, and the holding time is 1 hour; the calcination temperature of niobium oxalate and tantalum oxalate is 820°C, and the holding time is 2 hours; corresponding oxide powders are obtained respectively.

[0031] (2) According to (Co 4 NbTaO 9 ) 0.4 (CoNbTaO 6 ) 0.6 Weigh the oxide powder at the molar ratio, add absolute ethanol and place it in a grinder for ball milling and mixing while refining the powder particle size, the speed is 2400 rpm, the grinding and mixing time is 10 hours, and the temperature is kept at 100°C Powder D was obtained after drying for 6 hours.

[0032] (3) Weigh 3g of powder D and place it in a cold isostatic press for compression molding, the pressure is 300MPa, the holding time is 2 minutes, and then sintered at 1000°C for 2 hours to finally obtain...

Embodiment 2

[0038] (1) Mg(OH) 2 and niobium oxalate are placed in an alumina crucible and then calcined and decomposed in a medium temperature furnace, Mg(OH) 2 The calcination temperature is 460°C and the holding time is 1 hour; the calcination temperature of niobium oxalate is 820°C and the holding time is 2 hours; corresponding oxide powders are obtained respectively.

[0039] (2) According to (Mg 5 Nb 4 o 15 ) 0.4 (Mg 4 Nb 2 o 9 ) 0.1 (MgNb 2 o 6 ) 0.5 Weigh the oxide powder at the molar ratio, add absolute ethanol and place it in a grinder for ball milling and mixing while refining the powder particle size, the speed is 2000 rpm, the grinding and mixing time is 12 hours, and the temperature is kept at 90°C Powder D was obtained after drying for 6 hours.

[0040] (3) Weigh 2.5g of powder D and place it in a cold isostatic press for compression molding, the pressure is 350MPa, the holding time is 2 minutes, and then sintered at 930°C for 2 hours to obtain a dense (Mg 5 Nb ...

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Abstract

The invention discloses a multiphase tantalum/niobate composite ceramic and a preparation method thereof. The tantalum/niobate composite ceramic comprises two or more substances with chemical formulas of AB2O6, A2B2O7, A4B2O9 and A5B4O15, A is a mixture of one or more elements of Ca, Mg, Co, Ni, Zn and Sr, B = Nb1-aTaa, and a is greater than or equal to 0 and greater than or equal to 1. The tantalum/niobate composite ceramic with multiphase composition has the advantages of uniform grain size, high density, excellent fracture toughness, high thermal stability and low thermal conductivity, and is a composite ceramic with excellent performance.

Description

technical field [0001] The invention belongs to the field of material science and engineering technology, and in particular relates to a multi-phase tantalum / niobate composite ceramic and a preparation method thereof. Background technique [0002] High-temperature structural ceramics require materials with high melting point, excellent high-temperature stability, outstanding mechanical properties (high hardness, high Young's modulus and high fracture toughness) and chemical stability. The advantages of low preparation cost, simple preparation process and wide source of raw materials will promote the large-scale application of materials. Rare earth tantalum / niobate, as a new type of ultra-high temperature thermal insulation protective coating material, has been applied in some fields, such as high-temperature blade surface protective coating, rocket engine protective coating, and acid and alkali corrosion protection. [0003] The main problem of rare earth tantalate is that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3255C04B2235/3275C04B2235/3206C04B2235/96C04B2235/9607Y02E60/10
Inventor 陈琳冯晶罗可人李柏辉郭俊王建坤张陆洋
Owner KUNMING UNIV OF SCI & TECH
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