Two-phase cobalt tantalate ceramic block and preparation method thereof

A technology of ceramic block and tantalic acid, which is applied in the field of two-phase cobalt tantalate ceramic block and its preparation, can solve the problems of poor fracture toughness, limited application, and high thermal conductivity of ceramics, and prevent over-burning and excessive grain growth big effect

Active Publication Date: 2021-10-26
陕西天璇涂层科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Co 4 Ta 2 o 9 and CoTa 2 o 6 Poor fracture toughness and high thermal conductivity of ceramics limit their further applications

Method used

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  • Two-phase cobalt tantalate ceramic block and preparation method thereof
  • Two-phase cobalt tantalate ceramic block and preparation method thereof
  • Two-phase cobalt tantalate ceramic block and preparation method thereof

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[0026] The invention also discloses a method for preparing a two-phase cobalt tantalate ceramic block. The two-phase cobalt tantalate ceramic block is made of Co 4 Ta 2 o 9 and CoTa 2 o 6 constitute, and Co 4 Ta 2 o 9 and CoTa 2 o 6 The molar ratio is X: (1-X), 1>X>0; Concretely comprises the following steps:

[0027] Cobalt carbonate is calcined and decomposed at a calcining temperature of 430-450°C to obtain cobalt oxide powder; tantalum oxalate is calcined and decomposed at a calcining temperature of 910-920°C to obtain tantalum oxide powder. The thermally decomposed cobalt oxide and tantalum oxide have extremely high activity, which makes the energy and temperature required for the reaction of cobalt oxide and tantalum oxide drop sharply. Original Co 4 Ta 2 o 9 has a lower melting point than CoTa 2 o 6 , after using highly active raw material oxides, the two can be reacted simultaneously at low temperature.

[0028] In the present invention, the single-phase...

Embodiment 1

[0035] After cobalt carbonate and tantalum oxalate are placed in an alumina crucible, they are calcined and decomposed in a medium temperature furnace. The calcination temperature of cobalt carbonate is 450°C, and the holding time is 1 hour; the calcination temperature of tantalum oxalate is 910°C, and the holding time is 1 hour.

[0036] According to (Co 4 Ta 2 o 9 ) 0.2 (CoTa 2 o 6 ) 0.8 Molar ratio Weigh cobalt oxide and tantalum oxide powder raw materials, add absolute ethanol and place them in a grinder for ball milling and mixing while refining the powder particle size, the speed is 2400 rpm, and the grinding and mixing time is 24 hours. After taking it out, it was kept at 80° C. for 7 hours, and powder A was obtained after drying. Directly heat powder A at 860°C for 1 hour to obtain evenly mixed (Co 4 Ta 2 o 9 ) 0.2 (CoTa 2 o 6 ) 0.8 Two-phase powder B.

[0037] Weighed 2.6g of powder B and placed it in a cold isostatic press for compression molding at a ...

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Abstract

The invention discloses a two-phase cobalt tantalate ceramic block and a preparation method thereof. The two-phase cobalt tantalate ceramic block is composed of Co4Ta2O9 and CoTa2O6, and a molar ratio of Co4Ta2O9 to CoTa2O6 is X: (1-X), wherein X is smaller than 1 and greater than 0, the thermal conductivity of the two-phase cobalt tantalate ceramic block is 1.5-2.8 W.m<-1>. K<-1>, and the fracture toughness of the ceramic block is greater than 2MPa.m<1/2>. According to the invention, cobalt oxide and tantalum oxide which are high in sintering and reaction activity are obtained through thermal decomposition, a temperature needed for generating Co4Ta2O9 and CoTa2O6 compact ceramics through a reaction is effectively reduced, the phenomena of overburning and excessive grain growth are prevented, and the above two ceramics can undergo reaction, crystallization and nucleation at the same low temperature; and meanwhile, two cobalt tantalate grains realize crystallization, growing and mutual competition at the same time, so the effects of inhibiting grain growth and improving material density are achieved, a ceramic material with a grain size of smaller than 10 micrometers is obtained, the fracture toughness of the material is effectively improved, the heat conductivity of the material is reduced, and the final ceramic material has density of larger than 99%, porosity of smaller than 1% and material purity of larger than 99%.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a two-phase cobalt tantalate ceramic block and a preparation method thereof. Background technique [0002] New ceramics are made of artificially synthesized high-purity inorganic compounds as raw materials, and are made into inorganic materials with fine crystal structure through molding, sintering and other treatments under strictly controlled conditions. It has a series of superior physical, chemical and biological properties, and its application range is far beyond that of traditional ceramics. This type of ceramics is also called special ceramics or fine ceramics. [0003] co 4 Ta 2 o 9 and CoTa 2 o 6 Ceramics have excellent high-temperature phase stability and corrosion resistance. Using the excellent high-temperature chemical compatibility and extremely high bonding strength of the cobalt tantalate and NiCoCrAlY bonding layer can greatly increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/9607C04B2235/96C04B2235/442C04B2235/449C04B2235/77C04B2235/786
Inventor 陈琳冯晶王建坤张陆洋李振军王峰
Owner 陕西天璇涂层科技有限公司
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