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Method for preparing superhigh temperature carbonized hafnium ceramic nano-powder

A nano-powder, hafnium carbide technology, applied in the field of materials, can solve problems such as product agglomeration, and achieve the effects of improving sintering performance, convenient operation, simple and easy-to-control process

Active Publication Date: 2017-04-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The precursors in this patent are oxides, oxychlorides, hydroxides of non-carbon elements in carbides, or organic complexes formed by the non-carbon elements and alcohols or ketones, or alkoxides of the non-carbon elements, oxygen The oxide sol obtained by chloride hydrolysis requires subsequent reaction at a higher temperature, so that the product will be agglomerated due to high temperature preparation

Method used

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  • Method for preparing superhigh temperature carbonized hafnium ceramic nano-powder

Examples

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Effect test

Embodiment 1

[0026] A preparation method of ultra-high temperature hafnium carbide ceramic nanopowder, adopting the following steps:

[0027] (1) Weigh a certain amount of analytically pure anhydrous sucrose and evenly disperse it in deionized water, stir it magnetically for 20 minutes to obtain a uniform and transparent sucrose solution, control its concentration to 0.02g / ml, and then add 0.05wt% polyethylene to it Pyrrolidone (PVP K30) and cetyltrimethylammonium bromide (CTAB) mixed template, the purity of the above-mentioned raw materials ≥ 99.5%, continue magnetic stirring for 20min, control the mass ratio of PVP K30 and CTAB in the above solution to be (9 : 1), and finally obtain a uniform and transparent precursor solution;

[0028] (2) Pour the precursor solution into a hydrothermal kettle with a Teflon lining. The hydrothermal kettle in the present embodiment is a 50ml Teflon-lined water tank produced by Shanghai Yanzheng Experimental Instrument Co., Ltd. Heat the kettle, the fill...

Embodiment 2

[0032] A preparation method of ultra-high temperature hafnium carbide ceramic nanopowder, adopting the following steps:

[0033] (1) Weigh a certain amount of analytically pure anhydrous sucrose and evenly disperse it in deionized water, stir it magnetically for 30 minutes to obtain a uniform and transparent sucrose solution, control its concentration to 0.08g / ml, and then add 0.1wt% polyethylene to it Pyrrolidone (PVP K30) and cetyltrimethylammonium bromide (CTAB) mixed template agent, continue magnetic stirring for 30 minutes, control the mass ratio of PVP K30 and CTAB in the above solution to (4:1), and finally obtain a uniform and transparent the precursor solution;

[0034] (2) Pour the precursor solution into a hydrothermal kettle with a Teflon lining, the filling degree is controlled at 55%, seal the hydrothermal kettle, put it into an electric blast drying oven, and adjust the appropriate temperature for reaction . The hydrothermal temperature is controlled at 170°C,...

Embodiment 3

[0038] A preparation method of ultra-high temperature hafnium carbide ceramic nanopowder, adopting the following steps:

[0039] (1) Weigh a certain amount of analytically pure anhydrous sucrose and evenly disperse it in deionized water, stir it with magnetic force for 40min to obtain a uniform and transparent sucrose solution, control its concentration to 0.1g / ml, then add 0.2wt% polyethylene to it Pyrrolidone (PVP K30) and cetyltrimethylammonium bromide (CTAB) mixed template agent, continue magnetic stirring for 40min, control the mass ratio of PVP K30 and CTAB in the above solution to (7:3), and finally obtain a uniform and transparent the precursor solution;

[0040] (2) Pour the precursor solution into a Teflon-lined hydrothermal kettle, control the filling degree at 60%, seal the hydrothermal kettle, put it into an electric blast drying oven, and adjust the appropriate temperature for reaction . The hydrothermal temperature is controlled at 180°C, the pressure is 10MPa...

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Abstract

The invention relates to a method for preparing superhigh temperature carbonized hafnium ceramic nano-powder. Anhydrous saccharose is evenly dispersed in deionized water, a mixed template is added, stirring is carried out, an even and transparent precursor solution is obtained, and the solution is poured into a hydrothermal still; the hydrothermal still is placed in an electric heating air blowing drying box for reacting after being sealed, then the product is cooled to room temperature, and filtering, separation, washing and drying are carried out; finally, the product is mixed with hafnium powder, a vacuum carburizing reaction is carried out, and HfC nano particles are prepared. Compared with the prior art, the prepared carbonized hafnium ceramic nano-powder is good in crystallinity and dispersity and controllable in morphology.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of ultra-high temperature hafnium carbide ceramic nanopowder. Background technique [0002] Ultra-high temperature ceramics (UHTCs) material is a new type of high-temperature ablation-resistant structural material, which has a high melting point (>2000 ° C), high hardness, and high strength under high temperature conditions. , low coefficient of thermal expansion and good thermal physical and chemical stability, high thermal conductivity and electrical conductivity. Most importantly, it has good anti-ablation performance and is used in thermal structural components of supersonic aircraft and solid rockets, such as nozzles, wing leading edges and hot end parts of engines; it is also used in high-temperature electrodes and cutting tools , and thus has received extensive attention. Ultra-high temperature ceramics are mostly carbides (HfC, ZrC, TaC, NbC) and borides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/626B82Y30/00
CPCB82Y30/00C04B35/5622C04B35/62605
Inventor 郝巍赵晓峰郭芳威肖平王欣王冠张启晖
Owner SHANGHAI JIAO TONG UNIV
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