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Preparation method of lsm bulk material

A technology of bulk material and powder, applied in the field of preparation of LaSrxMnO3 bulk material, can solve the problem of less molding research and other problems

Active Publication Date: 2020-10-23
上海氢程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the limitation of the field of use of the prior art LSM block material, and its forming research is less. If only square or cylindrical blocks can be made through extrusion molding, for complex-shaped LSM Bulk materials, deficiencies that extrusion molding techniques are powerless to provide, offer an LSM (La (1-x) Sr x MnO 3 ) Preparation method of bulk material

Method used

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  • Preparation method of lsm bulk material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The conductive ceramic powder (La 0.75 Sr 0.25 MnO 3 ), dispersant (PAA-3000) and plasticizer (PEG-600) are mixed evenly to obtain a ceramic suspension slurry with a solid content of 50vol%; wherein, the amount of dispersant or plasticizer is the mass of conductive ceramic powder 1%, in order to make the obtained slurry have better fluidity, the pH value of the system is adjusted to 7.0 with ammonia water.

[0037] Dissolve agar in 50mL water, the agar content is 4%, and heat it to above 90°C to dissolve it to obtain an agar aqueous solution; pour the slurry with a pH value of 7.0 into the agar aqueous solution, heat and stir to mix evenly, and then pour it into a mold Cool at medium room temperature (5-15°C) to obtain the LSM gel body, such as figure 1 shown.

[0038] Dry the LSM gel body in an oven at 50°C to remove moisture, and then go through debinding (the debinding temperature is 250°C) and sintering (the sintering temperature is 1200°C) to obtain the LSM blo...

Embodiment 2

[0040] The conductive ceramic powder (La 0.6 Sr 0.4 MnO 3 ), a dispersant (PAA-3000) and a plasticizer (PEG-600) are uniformly mixed to obtain a ceramic suspension slurry with a solid content of 60vol%; wherein, the amount of the dispersant or plasticizer is the mass of the conductive ceramic powder 2%, in order to make the obtained slurry have better fluidity, the pH value of the system is adjusted to 9.7 with ammonia water.

[0041] Dissolve agar in 50mL water, the agar content is 5%, and heat it to above 90°C to dissolve it to obtain an aqueous agar solution; pour the slurry with a pH value of 9.7 into the aqueous agar solution, heat, stir and mix evenly, and then pour it into a mold Cool at medium temperature (5-15°C) to obtain the LSM gel body.

[0042] Freeze-dry the LSM gel body, and then go through debinding (the debinding temperature is 250°C) and sintering (the sintering temperature is 1000°C) to obtain the LSM block.

Embodiment 3

[0044] The conductive ceramic powder (La 0.8 Sr 0.2 MnO 3 ), a dispersant (PAA-3000) and a plasticizer (PEG-600) are uniformly mixed to obtain a ceramic suspension slurry with a solid content of 60vol%; wherein, the amount of the dispersant or plasticizer is the mass of the conductive ceramic powder 3%, in order to make the obtained slurry have better fluidity, the pH value of the system is adjusted to 9.7 with ammonia water.

[0045] Dissolve agar in 50mL water, the agar content is 5%, and heat it to above 90°C to dissolve it to obtain an aqueous agar solution; pour the slurry with a pH value of 9.7 into the aqueous agar solution, heat, stir and mix evenly, and then pour it into a mold Cool at medium temperature (5-15°C) to obtain the LSM gel body.

[0046] The LSM gel body is dried with color-changing silica gel at room temperature to absorb water, and then undergoes degumming (the degumming temperature is 250°C) and sintering (the sintering temperature is 1000°C) to obta...

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Abstract

The invention discloses a preparation method of an LSM (La(1-x)SrxMnO3) block material. The preparation method comprises the following steps: adjusting the pH value of a mixed slurry of a conductive ceramic powder La(1-x)SrxMnO3, a dispersant and a plasticizer, uniformly mixing with an aqueous agar solution, and then cooling to obtain an LSM gel blank; drying LSM gel blank, discharging gel and sintering to obtain the LSM block material, wherein the pH value of the slurry is greater than 3 and smaller than or equal to 10; the temperature of the aqueous agar solution is higher than or equal to 90 DEG C, and the agar content of the aqueous agar solution is 0.5-10%. According to the preparation method, the aqueous agar solution is used as a bonding agent, the use of an initiator is not required, and gel formation can be achieved only through temperature adjustment; and environment friendliness is achieved, operation is simple and easy to implement, and the cost is relatively low.

Description

technical field [0001] The present invention relates to a kind of La (1-x) Sr x MnO 3 (LSM) methods for the preparation of bulk materials. Background technique [0002] Due to its unique properties, ceramic materials have been widely used in chemical industry, machinery, electronics and other fields in recent years, and the La perovskite structure (1-x) Sr x MnO 3 (LSM) ceramic materials have gradually attracted people's attention in the fields of physics and chemistry because of their giant magnetoresistance and catalytic properties ([J]ScriptaMaterialia, 2005, 52, 1305-1309). In some fields, it is required to prepare LSM block, which makes the forming process of LSM ceramic powder developed. [0003] The common molding techniques of ceramic materials include powder direct sintering method, slurry consolidation method, grouting method, sol-gel method and gel casting method. The traditional gel casting technology is to use ammonium persulfate to trigger the polymeriza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/624C04B35/63
CPCC04B35/50C04B35/622C04B35/624C04B35/6303C04B2235/6023C04B2235/656
Inventor 张诗雨彭程关成志肖国萍王建强
Owner 上海氢程科技有限公司