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a zrc 1-x The preparation method of -sic composite phase ceramics

A technology of zrc1-x-sic and multiphase ceramics, applied in the field of special ceramics, can solve the problems of coarse SiC grains and unfavorable mechanical properties of materials, and achieve the effects of simple preparation process, easy realization of scale and easy availability of raw materials

Active Publication Date: 2021-04-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low melting point of Si powder, it is easy to form liquid phase Si and aggregate before it is fully reacted during high-temperature sintering, resulting in relatively coarse SiC grains, which is not conducive to the mechanical properties of the material.

Method used

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  • a zrc <sub>1-x</sub> The preparation method of -sic composite phase ceramics
  • a zrc <sub>1-x</sub> The preparation method of -sic composite phase ceramics
  • a zrc <sub>1-x</sub> The preparation method of -sic composite phase ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A ZrC 1-x -Preparation method of SiC composite phase ceramics:

[0023] ZrC 1.0 Powder (0.5~2μm, 98.5wt%) and Si 3 N 4 Powder (0.1~1.5μm, 99wt%) is batched according to the mass ratio of 92:8, with ethanol as the medium, Si 3 N 4 The balls were ball milled on a roller ball mill at a speed of 200 r / min for 24 hours, and then obtained by rotary evaporation to obtain ZrC 1.0 -Si 3 N 4 Mix the dry powder; keep the mixed dry powder at 1550°C for 1 hour under vacuum conditions, and react to prepare ZrC 1-x - SiC composite powder; put the obtained composite powder into a graphite mold, and keep it in an inert atmosphere (argon gas with a mass purity of 99.99 or more) for 1 hour at 2000 ° C and 30 MPa hot-pressing sintering conditions to obtain ZrC 1-x - SiC composite ceramics;

[0024] After analysis: the density of the prepared composite ceramics reaches 100%, which is composed of ZrC 1-x and SiC two-phase composition, ZrC 1-x The average grain size of the SiC phas...

Embodiment 2

[0026] A ZrC 1-x -Preparation method of SiC composite phase ceramics:

[0027] ZrC 1.0 Powder (0.5~2μm, 98.5wt%) and Si 3 N 4 Powder (0.1~1.5μm, 99wt%) is batched according to the mass ratio of 95:5, with ethanol as the medium, Si 3 N 4 The balls were ball milled on a roller ball mill at a speed of 200 r / min for 24 hours, and then obtained by rotary evaporation to obtain ZrC 1.0 -Si 3 N 4 Mix dry powder; keep the mixed dry powder at 1600°C for 0.5 hours under vacuum conditions, and react to prepare ZrC 1-x -SiC composite powder; put the obtained composite powder into a graphite mold, and keep it in an inert atmosphere (argon gas with a mass purity of 99.99 or more) for 1 hour under the hot-press sintering condition of 2050°C / 25MPa to obtain ZrC 1-x - SiC composite ceramics;

[0028]After analysis: the density of the prepared composite ceramics reaches 100%, and its XRD pattern is as follows: figure 2 As shown, it can be seen that the prepared composite ceramics only...

Embodiment 3

[0030] A ZrC 1-x -Preparation method of SiC composite phase ceramics:

[0031] ZrC 1.0 Powder (0.5~2μm, 98.5wt%) and Si 3 N 4 Powder (0.1~1.5μm, 99wt%) is batched according to the mass ratio of 98.5:1.5, with ethanol as the medium, Si 3 N 4 The balls were ball milled on a roller ball mill at a speed of 200 rpm for 24 hours, and then obtained by rotary evaporation to obtain ZrC 1.0 -Si 3 N 4 Mix the dry powder; keep the mixed dry powder at 1600°C for 1 hour under vacuum conditions, and react to prepare ZrC 1-x -SiC composite powder; put the obtained composite powder into a graphite mold, and keep it in an inert atmosphere (argon gas with a mass purity of 99.99 or more) for 1.5 hours under the hot-press sintering condition of 2100°C / 40MPa to obtain ZrC 1-x - SiC composite ceramics;

[0032] After analysis: the density of the prepared composite ceramics reaches 100%, and its XRD pattern is as follows: image 3 As shown, it can be seen that the prepared composite ceramic...

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Abstract

The invention discloses a ZrC 1‑x - The preparation method of SiC composite phase ceramics, is characterized in that, takes ZrC 1.0 、Si 3 N 4 Raw material powder, mixed evenly to get ZrC‑Si 3 N 4 Mixed powder; ZrC 1.0 -Si 3 N 4 The mixed powder is heated and kept warm under vacuum conditions, and the reaction is made of ZrC 1‑x ‑SiC composite powder; ZrC 1‑x ‑SiC composite powder is put into a graphite mold, under the condition of hot pressing and sintering, it is kept warm in an inert atmosphere to obtain ZrC 1‑x ‑SiC composite ceramics. The present invention uses Si 3 N 4 with ZrC 1.0 In situ reaction to generate fine SiC particles and non-stoichiometric carbon-deficient ZrC 1‑x , the density of the prepared ceramics is as high as 100%, ZrC 1‑x The average grain size of the phase is only 2-3 μm, and it also has the advantages of cheap and easy-to-obtain raw materials, simple preparation process, strong controllability, and easy scale-up.

Description

technical field [0001] The present invention relates to a kind of ZrC 1-x - A preparation method of SiC composite ceramics, belonging to the technical field of special ceramics. Background technique [0002] The fourth-generation fission nuclear energy system, represented by six reactor design concepts including high-temperature gas-cooled reactor, supercritical water-cooled reactor, molten salt reactor, sodium-cooled fast reactor, lead-cooled fast reactor, and gas-cooled fast reactor, is considered to have better Safety and economic competitiveness are the development trend and technological frontier of advanced nuclear energy systems. However, the service environment of the fourth-generation fission nuclear energy system is more harsh, and the operating temperature and irradiated neutron fluence are significantly higher than the second-generation fission nuclear energy system, which brings new challenges to the structural materials used in the existing nuclear energy syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/645C04B35/622
CPCC04B35/5622C04B35/622C04B35/645C04B2235/3826C04B2235/5436C04B2235/5445C04B2235/656C04B2235/6567C04B2235/658C04B2235/77C04B2235/782C04B2235/786C04B2235/96
Inventor 刘吉轩张国军
Owner DONGHUA UNIV