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Hafnium diboride-tantalum disilicide composite powder and preparation method thereof

A technology of tantalum disilicide and hafnium diboride, which is applied in the field of hafnium diboride-tantalum disilicide composite powder and its preparation, and can solve the problems of reduced oxidation resistance

Active Publication Date: 2022-01-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, as a single hafnium diboride as an anti-oxidation material, there will be a large amount of volatilization of glass phase B2O3 and HfO2 The phenomenon of bare oxide porous skeleton, resulting in greatly reduced antioxidant capacity

Method used

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  • Hafnium diboride-tantalum disilicide composite powder and preparation method thereof
  • Hafnium diboride-tantalum disilicide composite powder and preparation method thereof
  • Hafnium diboride-tantalum disilicide composite powder and preparation method thereof

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preparation example Construction

[0035] The present invention provides a method for preparing the above-mentioned hafnium diboride-tantalum disilicide composite powder, comprising the following steps:

[0036] (1) Mix hafnium diboride powder, tantalum disilicide powder, binder and polar dispersing solvent to obtain a precursor powder dispersion, and the mass ratio of the hafnium diboride powder to tantalum disilicide powder is 2 ~11:1;

[0037] (2) Perform granulation, spheroidization and ultrasonication on the precursor powder dispersion in sequence to obtain a hafnium diboride-tantalum disilicide composite powder.

[0038] In the present invention, hafnium diboride powder, tantalum disilicide powder, binder and polar dispersing solvent are mixed to obtain a precursor powder dispersion liquid, and the mass ratio of the hafnium diboride powder to tantalum disilicide powder is 2-2. 11:1. In the present invention, the particle size of the hafnium diboride powder is preferably 1-3 μm, more preferably 2 μm; the...

Embodiment 1

[0069] (1) Add 739.9g of hafnium diboride, 260.1g of tantalum disilicide, 5g of PVA and 1500g of deionized water into the ball mill tank with a ball-to-material ratio of 4:1, and ball mill for 3 hours at 250r / min to mix the ingredients evenly , to obtain a suspension of precursor powder;

[0070] (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. HfB with diameter2 -TaSi 2 Agglomerated powder (HfB 2 with TaSi 2 The volume ratio is 7:3);

[0071] Among them, the spray drying granulation parameters are: inlet temperature 250°C, outlet temperature 130°C, nozzle speed 35Hz, peristaltic pump speed 30rpm;

[0072] (3) HfB 2 -TaSi 2 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment and the spheroidized powder is collected. T...

Embodiment 2

[0079] (1) Add 830.2g of hafnium diboride, 169.8g of tantalum disilicide, 5g of PVA and 1500g of deionized water into the 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 , to obtain a suspension of precursor powder;

[0080] (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. HfB with diameter2 -TaSi 2 Agglomerated powder (HfB 2 with TaSi 2 The volume ratio is 8:2);

[0081] Among them, the spray drying granulation parameters are: inlet temperature 250°C, outlet temperature 130°C, nozzle speed 35Hz, peristaltic pump speed 35rpm;

[0082] (3) HfB 2 -TaSi 2 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment and the spheroidized powder is collected. ...

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Abstract

The invention provides hafnium diboride-tantalum disilicide composite powder and a preparation method thereof, and belongs to the technical field of composite powder materials. The hafnium diboride-tantalum disilicide composite powder provided by the invention is in a molten eutectic state and comprises hafnium diboride and tantalum disilicide at mass ratio of (2-11): 1. Tantalum disilicide is used as a modification component of hafnium diboride. On one hand, a high-temperature oxidation product SiO2 of tantalum disilicide can be used as a good high-temperature sealing and filling phase to fill holes of a hafnium diboride coating. On the other hand, another high-temperature oxidation product Ta2O5 of tantalum disilicide can be subjected to a solid solution reaction with HfO2 to form HfTaOx, so that the crystal transformation of HfO2 is inhibited to a certain extent, and the high-temperature thermal stability of the powder is improved. Therefore, the hafnium diboride-tantalum disilicide composite powder provided by the invention has good high-temperature oxidation and ablation resistance.

Description

technical field [0001] The invention relates to the technical field of composite powder materials, in particular to a hafnium diboride-tantalum disilicide composite powder and a preparation method thereof. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have the characteristics of low density, low thermal expansion coefficient at high temperature and excellent mechanical properties, and are regarded as one of the most promising materials for application in aircraft hot-end parts. However, in an aerobic environment above 400 °C, carbon fiber reinforced carbon matrix composites are easily oxidized, resulting in reduced performance. One of the effective methods is to prepare an anti-oxidation ablation coating on its surface. [0003] Hafnium diboride (HfB 2 ) is a hexagonal metalloid structure compound with high melting point (3380°C), high hardness and excellent chemical stability. It is expected to be used as an anti-oxidation ablation c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
CPCC04B35/58078C04B35/62605C04B35/62695C04B35/62665C04B35/62222C04B2235/3891C04B2235/5436C04B2235/9684
Inventor 柳彦博谢明劭刘少璞王一帆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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