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Sagger

A saggar and spinel technology, which is applied in the field of saggars for powder sintering, can solve the problems of reduced product strength and reduced thermal shock resistance.

Inactive Publication Date: 2011-09-21
NGK INSULATORS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to solve the above-mentioned problems, and to provide a saggar that seeks to improve the corrosion resistance against lithium diffusion by containing a magnesia component, and at the same time, can suppress an increase in the coefficient of thermal expansion of the sagger by containing a magnesia component, Can effectively avoid the problem of thermal shock reduction caused by the increase of thermal expansion rate and the problem of product strength reduction

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1～4、 comparative example 1～5

[0038] The mixture obtained by blending each raw material was kneaded and sintered to prepare samples (200 mm×200 mm, thickness 10 mm) having the composition ratios shown in Table 1. The magnesium oxide raw material used is a raw material with a purity of more than 99%. Molding is carried out by adding PVA, by hydraulic pressure molding. Sintering is carried out at 1350°C.

[0039] Crystal phase composition ratio

[0040] Using an X-ray diffractometer (RINT 1100K) manufactured by Rigaku Denki Co., Ltd., each sample after sintering was measured under the following conditions, and the crystal phase composition ratio was investigated.

[0041] Tube voltage: 40kV, tube current: 20mA, divergence slit 1°, scattering slit 1°, light receiving slit 0.3mm. The integral intensity is obtained by the JADE integral intensity method.

[0042] Thermal Shock Evaluation

[0043] The test pieces (120×120×11t) cut out from the obtained samples were heated at 200° C. for 1 hour, and the furna...

Embodiment 5～7

[0068] This is an example containing spinel with a particle size of 1 mm or less and periclase with a particle size of 0.5 mm or less as aggregates. Good values ​​were shown in both bending strength and thermal shock resistance.

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Abstract

The present invention provides a sagger which is used for sintering powder of lithium compound and realizing corrosion resistance improvement for lithium diffusion through containing a magnesium oxide component. Simultaneously, thermal expansion coefficient increase of the sagger can be restrained through containing the magnesium oxide component, thereby effectively preventing a thermal shock performance reduction problem and a product strength reduction problem which are caused by the thermal expansion coefficient increase. The sagger which is used for sintering the powder of the lithium compound according to the invention comprises spinel with grain diameter that is smaller than 1 mm and periclase with grain diameter that is smaller than 0.5 mm. The composition ratio of the crystal phase is as follows: cordierite: periclase: spinel: corundum: mullite=1:(0.1-0.7):(0.03-0.4):(0.01-0.15):(0.06-1.10).

Description

technical field [0001] The present invention relates to a sagger for powder firing which is particularly excellent in thermal shock and corrosion resistance. Background technique [0002] Lithium cobaltate (LiCoO 2 ), lithium manganate (LiMnO 2 ), lithium nickelate (LiNiO 2 ), lithium iron phosphate (LiFePO 4 ) and other lithium-containing transition metal composite oxides. [0003] For example, especially the manufacture of LiMnO whose demand has increased in recent years 2 At the time, the mixture of lithium compound (lithium hydroxide or lithium nitrate) and manganese compound (manganese oxide, manganese hydroxide or manganese carbonate) as raw materials is put into a sintering container (commonly called a sagger) formed of a heat-resistant ceramic material. or burner) in an oxygen atmosphere at a temperature of around 1000°C. [0004] Fabrication of LiMnO under this sintering temperature condition 2 During the sintering process, the lithium compound is melted, and...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 木下寿治中西泰久稗田耕士
Owner NGK INSULATORS LTD
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