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Micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feed and preparation method thereof

A technology for stabilizing zirconia and silicon carbide, which is used in the field of micro-nano powder, micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feeding and preparation, which can solve the problem of incomplete coating melting, coarse feeding particle size and inconsistent composition. Uniformity and other problems, to achieve the effect of low bulk density, fine powder particle size and uniform composition

Active Publication Date: 2021-08-10
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feeding material and its preparation method, which solves the problems of coarse particle size, uneven composition, incomplete melting and poor density of the traditional feeding material

Method used

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  • Micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feed and preparation method thereof
  • Micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feed and preparation method thereof
  • Micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feed and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Step 1, configure ZrOCl according to a certain ratio 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 O mixed solution; the volume of mixed solution is 1000mL, ZrOCl 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 The mass fraction of O is 30wt.%, Zr 4+ Ca 2+ The molar concentration ratio is 92:8.

[0041] In step 2, excessive ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 30%.

[0042] Step 3, dissolving a certain amount of polycarbosilane (PCS) in p-xylene solution, the volume of the configuration solution is 300mL, and the mass fraction of polycarbosilane (PCS) is 20wt.%.

[0043] Step 4, adding the solution configured in step 3 and a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of the PVA aqueous solution is 5%, and its addition amount is 200mL.

[0044] In step 5, the mixture in step 4 is ball milled in a roller ball mill, the speed of th...

Embodiment 2

[0048] Step 1, configure ZrOCl according to a certain ratio 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 O mixed solution; the volume of mixed solution is 1000mL, ZrOCl 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 The mass fraction of O is 50wt.%, Zr 4+ Ca 2+ The molar concentration ratio is 97:3.

[0049] In step 2, excessive ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 50%.

[0050] Step 3, dissolving a certain amount of polycarbosilane (PCS) in p-xylene solution, the volume of the configuration solution is 500mL, and the mass fraction of polycarbosilane (PCS) is 40wt.%.

[0051] Step 4, adding the solution configured in step 3 and a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of the PVA aqueous solution is 10%, and the added amount is 300mL.

[0052] Step 5, the mixture in step 4 is ball milled in a roller ball mill, the speed of the rol...

Embodiment 3

[0056] Step 1, configure ZrOCl according to a certain ratio 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 O mixed solution; the volume of mixed solution is 1000mL, ZrOCl 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 The mass fraction of O is 35wt.%, Zr 4+ Ca 2+ The molar concentration ratio is 96:4.

[0057] In step 2, excessive ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 42%.

[0058] In step 3, a certain amount of polycarbosilane (PCS) is dissolved in p-xylene solution, the volume of the solution is 350 mL, and the mass fraction of polycarbosilane (PCS) is 35 wt.%.

[0059] Step 4, adding the configured solution in step 3 and a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of the PVA aqueous solution is 9%, and its addition amount is 240mL.

[0060] Step 5, the mixture in step 4 is ball milled in a roller ball mill, the speed of the roller b...

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Abstract

The invention relates to a micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feed and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a ZrOCl2.8H2O / Ca(NO3)2.4H2O mixed solution; step 2, adding excessive ammonia water into the mixed solution, and continuously stirring to generate white precipitate, so as to form a solution A; step 3, dissolving polycarbosilane in a p-xylene solution to form a solution B; step 4, adding the solution B and a PVA aqueous solution into the solution A to obtain a mixture; step 5, performing ball milling on the mixture in the step 4 in a roller ball mill to obtain ball-milled slurry; step 6, granulating the slurry subjected to ball milling on a spray granulator, and removing moisture to obtain dried spherical mixed powder of Zr(OH)4, Ca(OH)2 and polycarbosilane; 7, putting spherical powder obtained after granulation into a corundum crucible, putting the corundum crucible into a vacuum sintering furnace to be calcined under the high-temperature condition, and Zr(OH)4, Ca(OH)2 and polycarbosilane (PCS) are subjected to high-temperature decomposition to form uniform SiC / CSZ spherical feed.

Description

technical field [0001] The invention belongs to the micro-nano powder in the technical field of high-temperature protection, and specifically relates to a micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feeding material and a preparation method. Background technique [0002] As a special material, thermal barrier coating is coated on the surface of the hot end parts, which has a good heat insulation effect. It is usually used to reduce the influence of steam turbine or engine blades from high temperature environment, and reduce the impact of substrate wear, high temperature oxidation and other factors on the substrate. Destruction can greatly prolong the service life of the blade and increase the working temperature of the machine. [0003] Calcia stabilized zirconia (ZrO 2 ) coating is currently the most promising thermal barrier material. Due to the tetragonal phase ZrO in the cooling process 2 The transition to the monoclinic phase will cause a v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/571C04B35/626C04B35/66
CPCC04B35/48C04B35/571C04B35/62605C04B35/62695C04B35/66C04B2235/5436C04B2235/5454C04B2235/5445
Inventor 杨哲一崔锦文王弘喆崔雄华张磊曹海涛
Owner XIAN THERMAL POWER RES INST CO LTD
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