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A boride- nitride complex-phase ceramic and its preparing process

A composite ceramic and preparation technology, applied in the field of inorganic non-metallic material science, can solve the problems of low strength and fracture toughness, which have not been solved well, and achieve the effect of easy acquisition, less process and excellent high temperature performance

Inactive Publication Date: 2009-09-30
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although boride ceramic materials have many advantages, their low strength and fracture toughness have not been well resolved, which is one of the key factors limiting their excellent performance.

Method used

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  • A boride- nitride complex-phase ceramic and its preparing process
  • A boride- nitride complex-phase ceramic and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 8 g ZrB 2 Powder, 1.5g Si 3 N 4 Powder and 0.5g Y 2 o 3 Mix the powder evenly, put it into a graphite mold, press it slightly to form it, put it into a discharge plasma sintering furnace together with the mold, and sinter at 1700°C for 10 minutes under a pressure of 20MPa in a vacuum environment, and cool to room temperature with the furnace. The ceramic block is taken out from the mold, and the surface layer is removed by grinding to obtain a zirconium diboride-silicon nitride composite ceramic with a relative density of more than 96%, and its microstructure is as follows: figure 2 shown.

Embodiment 2

[0022] 7 g ZrB 2 Powder, 2g Si 3 N 4 powder and 1 gram of Y 3 al 5 o 12 Mix the powder evenly, put it into a graphite mold, press it slightly to form it, put it into a discharge plasma sintering furnace together with the mold, and sinter at 1700°C for 6 minutes under a pressure of 20MPa in a vacuum environment, and cool to room temperature with the furnace. The ceramic block is taken out from the mould, and the surface layer is removed by grinding to obtain a zirconium diboride-silicon nitride composite ceramic with a relative density of more than 98%.

Embodiment 3

[0024] 7 g ZrB 2 Powder, 2g Si 3 N 4 powder and 1 gram of Y 3 al 5 o 12 Mix the powder evenly, put it into a graphite mold, put it into a hot-press sintering furnace together with the mold, and sinter at 1850°C for 60 minutes under a pressure of 25MPa in a vacuum environment, cool to room temperature with the furnace, and take the ceramic block out of the mold , and the surface layer is removed by grinding to obtain a zirconium diboride-silicon nitride composite ceramic with a relative density of more than 97%.

[0025] Other sintering temperatures, pressures, times and proportions of various powders can also be selected to prepare high-density boride-nitride composite ceramics in a hot-press or spark plasma sintering furnace.

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Abstract

The invention relates to a boride- nitride complex-phase ceramic and its preparing process, with the proportion of raw charge: ZrB2 powder 55- 90wt%, Si03N4 powder5-30wt%, Al2O3 powder, Y2O3 powder, Y3Al5O12 powder, Mgo powder, CaO powder, SiO2 powder, Lu2O3 powder, Re2O3 powder 5-15wt%. The preparing technology includes commingling and loading the composite ceramic raw charge into the graphite jig, sintering in the heat pressing furnace or discharging plasma fritting furnace, taking out the sintered complex-phase ceramic and then carrying out the processing of surface sanding, the high compact boride- nitride complex-phase ceramic is obtained. This invention accounts for the difficulty of obtaining boride ceramic dense body and has the features of easy sintered and high compactness.

Description

Technical field: [0001] The invention relates to a boride-nitride composite ceramic and a manufacturing method thereof, belonging to the fields of inorganic non-metallic material science and high-temperature engineering ceramics. Background technique: [0002] With the development of high-temperature technology, materials are required to have excellent high-temperature comprehensive properties to adapt to harsh high-temperature environments, such as: high high-temperature strength, good thermal shock resistance, and high-temperature ablation resistance. Non-oxide-non-oxide composite ceramic materials are a kind of high-temperature engineering materials with great development prospects. It uses the complementarity of material properties to achieve comprehensive optimization of materials, among which boride-nitride composite ceramics are one of them. . [0003] Boride ceramic materials can maintain good physical and chemical stability in high-temperature environments and reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/66C04B35/622C04B35/64
Inventor 宋杰光纪岗昌李世斌张联盟
Owner JIUJIANG UNIVERSITY
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