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Method for performing oxide in-situ coating on zirconium diboride-silicon carbide aggregate powder

A zirconium diboride and in-situ coating technology, which is applied in the field of preparation of zirconium diboride-silicon carbide core-shell structure powder, can solve the problems of loose structure, powder easily broken, difficult to melt, etc., and achieve high density Sex, improve cohesion, improve the effect of density

Active Publication Date: 2018-03-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the powder obtained through the above-mentioned process has not been calcined and densified, and the surface of the spherical powder is generally loose, rough, and low in strength. During the coating preparation process, the powder is easily broken and difficult to melt during transportation; and The anti-oxidation ablation coating prepared by atmospheric plasma spraying system has problems such as many voids and loose structure

Method used

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  • Method for performing oxide in-situ coating on zirconium diboride-silicon carbide aggregate powder
  • Method for performing oxide in-situ coating on zirconium diboride-silicon carbide aggregate powder
  • Method for performing oxide in-situ coating on zirconium diboride-silicon carbide aggregate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 75g of zirconium diboride, 25g of silicon carbide, 0.8g of PVA and 100g of absolute ethanol into a ball mill tank with a ball-to-material ratio of 4:1, and ball mill for 6 hours at 100r / min to mix the ingredients evenly. Obtain the suspension of precursor powder;

[0036] (2) Transfer the suspension obtained in step (1) to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 80°C for 30 hours, and then passed through a test sieve to obtain granules. ZrB with a diameter of 20 μm to 90 μm 2 - SiC agglomerated powder;

[0037] Among them, the spray drying granulation parameters are: inlet temperature 210°C, outlet temperature 100°C, nozzle speed 25Hz, peristaltic pump speed 35rpm;

[0038] (3) ZrB obtained in step (2) 2 -SiC agglomerated powder is sent to the atmospheric plasma spheroidization equipment for spheroidization treatment, the spheroidized powder is collected by deionized water, and the...

Embodiment 2

[0045] (1) Add 80g of zirconium diboride, 20g of silicon carbide, 0.7g of PVA and 100g of absolute ethanol into a ball mill tank with a ball-to-material ratio of 4:1, and ball mill for 2 hours at 400r / min to mix the ingredients evenly. Obtain the suspension of precursor powder;

[0046] (2) Transfer the suspension obtained in step (1) to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 150°C for 20 hours, and then passed through a test sieve to obtain granules. ZrB with a diameter of 20 μm to 90 μm 2 - SiC agglomerated powder;

[0047] Among them, the spray drying granulation parameters are: inlet temperature 350°C, outlet temperature 130°C, nozzle speed 45Hz, peristaltic pump speed 50rpm;

[0048] (3) ZrB obtained in step (2) 2 -SiC agglomerated powder is sent to the atmospheric plasma spheroidization equipment for spheroidization treatment, the spheroidized powder is collected by deionized water, and th...

Embodiment 3

[0053] (1) Add 82g of zirconium diboride, 18g of silicon carbide, 0.9g of PVA and 100g of absolute ethanol into a ball mill tank with a ball-to-material ratio of 4:1, and ball mill for 4 hours at 300r / min to mix the ingredients evenly. Obtain the suspension of precursor powder;

[0054] (2) Transfer the suspension obtained in step (1) to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 120°C for 25 hours, and then passed through a test sieve to obtain granules. ZrB with a diameter of 20 μm to 90 μm 2 - SiC agglomerated powder;

[0055] Among them, the spray drying granulation parameters are: inlet temperature 270°C, outlet temperature 120°C, nozzle speed 30Hz, peristaltic pump speed 40rpm;

[0056] (3) ZrB obtained in step (2) 2 -SiC agglomerated powder is sent to the atmospheric plasma spheroidization equipment for spheroidization treatment, the spheroidized powder is collected by deionized water, and th...

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Abstract

The invention relates to a method for performing oxide in-situ coating on zirconium diboride-silicon carbide aggregate powder, belonging to the technical field of composite powder materials. The method comprises the following steps: carrying out in-situ coating on zirconium diboride-silicon carbide aggregate powder by utilizing oxides produced by self-oxidation of the zirconium diboride-silicon carbide aggregate powder in a high-temperature oxidation environment, and preparing composite powder with a core-shell structure. The oxide coated zirconium diboride-silicon carbide with the core-shellstructure prepared by the method has high degree of sphericity and density, and the requirement of plasma spraying on the powder is met; the oxide coating layer produced by self-oxidation can inhibitvolatilization of silicon carbide in the plasma spraying process, and loss of the silicon carbide is reduced. Moreover, the melting point of the oxide is lower than that of the zirconium boride, the powder can be fully molten, gaps, vacancy and other defects caused by lamella overlap in the coating are further filled, and the density of the coating is improved.

Description

technical field [0001] The invention relates to the preparation of a zirconium diboride-silicon carbide core-shell structure powder, in particular to a method for in-situ encapsulation of zirconium diboride-silicon carbide agglomerated powder by using oxides generated by auto-oxidation in a high-temperature oxidation environment. The covering method belongs to the technical field of composite powder materials. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have low density, low thermal expansion coefficient at high temperature and good mechanical properties. It is easily oxidized in an oxygen environment, resulting in a decrease in its performance. One of the effective methods is to prepare an anti-oxidation ablation coating on its surface. [0003] Zirconium diboride (ZrB 2 ) is a hexagonal metalloid structure compound, which has the advantages of high melting point (3040°C), high hardness and excellent chemical stability; silicon car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/58C04B35/628C04B35/626
CPCC04B35/58078C04B35/62695C04B35/62823C04B41/507C04B41/87C04B2235/3826C04B41/5059C04B41/5042C04B41/4527
Inventor 柳彦博马壮郭嘉仪孙世杰王皓张贺王乙瑾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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