Superfine transition metal boride powder as well as preparation method and application thereof

A transition metal and boride technology, which is applied in the field of ultrafine transition metal boride powder and its preparation, can solve the problems of unfavorable powder sintering and post-processing, difficult to remove residues, coarse powder particle size, etc. Good high temperature resistance, low agglomeration effect

Inactive Publication Date: 2018-08-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the raw materials are expensive, and the synthetic MB 2 Coarse powder particle size and low activity are not conducive to powder sintering and post-processing
2) High-temperature self-propagating method: Although the traditional SHS method can obtain high-purity ZrB 2 powder, but the residue is difficult to remove; the existing SHS method uses zirconium hydride and elemental boron as raw materials and synthesizes it under an argon atmosphere, although powders with a particle size of less than 1 μm can be obtained
However, the main use of ultra-high temperature powder is as a spraying material in aerospace fields such as hypersonic vehicles. At this time, the temperature often endured is much higher than 1800°C. Applications are extremely limited

Method used

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  • Superfine transition metal boride powder as well as preparation method and application thereof
  • Superfine transition metal boride powder as well as preparation method and application thereof
  • Superfine transition metal boride powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Choose HfO 2 、 Ta 2 o 5 and B powder as powder raw material, HfO 2 、 Ta 2 o 5 The particle size distributions of powder B and B are 0.2μm, 0.1μm and 0.5μm respectively, and 100mmol HfO 2 Doped with 2.5mol% Ta 2 o 5 HfO 2 -Ta 2 o 5 Mixed powder and 393mmol simple substance B, using acetone as solvent, Si 3 N 4 The ball is the ball milling medium, mixed on a roller ball mill for 24h, and dried by rotary evaporation to obtain HfO 2 -Ta 2 o 5 -B mixed powder; wherein, the solid-dissolved TaB 2 The content x is 5mol%;

[0031] 2. Add HfO 2 -Ta 2 o 5 -B The mixed powder is placed in a graphite crucible, heated to 1000°C in a graphite furnace at an air pressure lower than 200Pa and kept for 2 hours to obtain Hf 0.95 Ta 0.05 B 2 -B 2 o 3 Powder;

[0032] 3. Will get Hf 0.95 Ta 0.05 B 2 -B 2 o 3 Under the condition that the air pressure is lower than 200Pa, the powder is continuously heated to 1500°C and kept for 1 hour to obtain ultrafine Hf 0.9...

Embodiment 2

[0035] The difference between this example and Example 1 is that: the second step of high temperature insulation is 1800° C. for 2 hours. image 3 For the Hf prepared in this example 0.95 Ta 0.05 B 2 The SEM photograph of the powder, from image 3 It can be seen that the powder will not grow significantly when the temperature is raised to 1800 °C in the second step, indicating that the solid solution TaB 2 The final transition metal hafnium boride powder can inhibit the surface diffusion of hafnium boride, so that the rapid growth of hafnium boride powder at high temperature will not occur, and its high temperature stability will be enhanced. Know through detecting and analyzing: the Hf that present embodiment makes 0.95 Ta 0.05 B 2 The average particle diameter of the powder is 60nm, and the oxygen content is 0.02wt%.

Embodiment 3

[0037] The difference between this example and Example 1 is that: the second step of high temperature insulation is 2200° C. for 1 hour. Know through detecting and analyzing: the Hf that present embodiment makes 0.95 Ta 0.05 B 2 The average particle diameter of the powder is 80nm, and the oxygen content is 0.01wt%.

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Abstract

The invention belongs to the technical field of superfine powders and discloses a superfine transition metal boride powder as well as a preparation method and the application thereof. The superfine transition metal boride powder is a MO2-Ta2O5-B mixed power obtained by ball-milling and mixing MO2, Ta2O5 and B and then drying; then the MO2-Ta2O5-B mixed power is subjected to first-step thermal insulation under an air pressure of less than 200 Pa or an inert atmosphere to obtain a M1-xTaxB2-B2O3 powder; the M1-xTaxB2-B2O3 powder is continuously heated up under an air pressure of less than 200 Paor an inert atmosphere and is subjected to second-step thermal insulation to prepare a M1-xTaxB2 powder, wherein M is equal to Zr or Hf, and x is 0.005-0.2. The powder is low in degree of aggregation, has good high temperature resistance and still does not grow at a high temperature above 1800 DEG C. The superfine transition metal boride powder as well as the preparation method and the application thereof disclosed by the invention have the benefits that the cost is significantly reduced, and the preparation process is simple and low in cost.

Description

technical field [0001] The invention belongs to the field of ultrafine powder technology, more specifically, relates to an ultrafine transition metal boride (M 1- x Ta x B 2 ) powder and its preparation method and application. Background technique [0002] Transition metal boride MB 2 (M=Zr, Hf) has excellent properties such as high melting point, hardness, thermal stability, and corrosion resistance. It is widely used in the production of ultra-high temperature structural materials, composite materials, and thin film materials. important applications in other fields. [0003] Currently, the existing preparation MB 2 The methods of the powder mainly include the following: 1) direct synthesis method: mainly utilize the M element and the element boron to carry out the compound reaction. The powder synthesized by the method has high purity and relatively simple synthesis conditions. But the raw materials are expensive, and the synthetic MB 2 Coarse powder particle size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B35/04C01P2004/03C01P2004/04C01P2004/64
Inventor 郭伟明吴利翔谭大旺牛文彬曾令勇林华泰
Owner GUANGDONG UNIV OF TECH
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