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A kind of max phase/nitride ceramic layered gradient composite material and its rapid preparation method and application

A technology of nitride ceramics and composite materials, which is applied in ceramic layered products, chemical instruments and methods, layered products, etc. The sintering process is complex and other problems, to achieve the effect of ensuring purity and performance, low sintering temperature, and wide application prospects

Active Publication Date: 2020-08-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, this method has a high sintering temperature and a long holding time, which easily leads to the pyrolysis of the MAX phase to form a large number of impurity phases (such as SiC, TiC, TiAl alloy, etc.), thereby reducing the insulation performance of the layered composite material; The pressure sintering process also has disadvantages such as complicated sintering process and long sintering cycle.
Therefore, the products obtained by hot pressing and sintering are difficult to be used as long-term high-temperature insulating packaging materials for liquid metal batteries, and some structural / functional integrated components

Method used

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  • A kind of max phase/nitride ceramic layered gradient composite material and its rapid preparation method and application
  • A kind of max phase/nitride ceramic layered gradient composite material and its rapid preparation method and application
  • A kind of max phase/nitride ceramic layered gradient composite material and its rapid preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Choose Ti 3 SiC 2 Powder, Si 3 N 4 Powder and corresponding sintering aids are the original powder materials, and 7-layer gradient materials are prepared by SPS sintering.

[0033] Ti 3 SiC 2 Powder, Si 3 N 4 Powder and corresponding sintering aids are mixed according to the designed volume fraction, and ethanol solvent is added for wet milling, and the ball milling time is 24 hours; the mixed powder required for each layer is mixed according to the following formula figure 1 As shown in c, put them in graphite molds for layering and pressing in sequence, each layer thickness is 1mm, then install the upper and lower pressure heads and coat the graphite carbon felt to complete the mold loading work; put the mold with the sample to be sintered in the spark plasma sintering system In the furnace, vacuumize to no higher than 0.01Pa, under the axial pressure of 70MPa, raise the temperature to 1200°C at a rate of 300°C / min, and then increase the temperature at a rate o...

Embodiment 2

[0035] Choose Ti 3 SiC 2Powder, Si 3 N 4 The powder and corresponding sintering aids are the original powder materials, and the 5-layer gradient materials are prepared by SPS sintering.

[0036] Ti 3 SiC 2 Powder, Si 3 N 4 Powder and corresponding sintering aids are mixed according to the designed volume fraction, and ethanol solvent is added for wet milling, and the ball milling time is 24 hours; the mixed powder required for each layer is mixed according to the following formula figure 1 As shown in a, place the layers in the graphite mold for layering and pressing in sequence, each layer is 2mm thick, then install the upper and lower pressure heads and coat the graphite carbon felt to complete the mold loading work; put the mold with the sample to be sintered in the spark plasma sintering system In the furnace, vacuumize to no higher than 0.01Pa, under the axial pressure of 50MPa, raise the temperature to 1200°C at a rate of 200°C / min, and then increase the temperatu...

Embodiment 3

[0038] Choose Ti 3 SiC 2 Powder, Si 3 N 4 Powder and corresponding sintering aids are the original powder materials, and 6-layer gradient materials are prepared by SPS sintering.

[0039] Ti 3 SiC 2 Powder, Si 3 N 4 Powder and corresponding sintering aids are mixed according to the designed volume fraction, and ethanol solvent is added for wet milling, and the ball milling time is 24 hours; the mixed powder required for each layer is mixed according to the following formula figure 1 As shown in middle b, lay up and press in the graphite mold in turn, each layer thickness is 1.5mm, then install the upper and lower pressure heads and coat the graphite carbon felt to complete the mold loading work; put the mold with the sample to be sintered in spark plasma sintering In the furnace of the system, vacuumize to no higher than 0.01Pa, under the axial pressure of 50MPa, heat up to 1200°C at a rate of 100°C / min, and then rise to 1380°C at a rate of 150°C / min and keep for 4 minu...

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Abstract

The invention discloses a MAX phase / nitride ceramic layered gradient composite material and its rapid preparation method and application, belonging to the technical field of preparation of ceramic matrix composite materials. The present invention adopts SPS sintering technology to prepare MAX phase / nitride ceramic layered gradient composite material. This method introduces an electric field on the basis of temperature field and pressure field, which can play a role in plasma activation of raw materials, so that it can be sintered at a lower Under the conditions of temperature and short holding time, dense multi-phase ceramic materials can be quickly prepared; at the same time, the activation of plasma also helps the diffusion of atoms, which in turn can promote the interlayer bonding of MAX phase and nitride, and realize MAX High-performance connection between phases and nitrides This method has the advantages of fast heating rate, low sintering temperature, and short holding time. This method can quickly prepare MAX phase / nitrogen with high density, low impurity content, and good interface bonding Gradient compound ceramic layered material.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic matrix composite materials, and in particular relates to a MAX phase / nitride ceramic layered gradient composite material and its rapid preparation method and application. Background technique [0002] The MAX phase ceramic material combines the excellent properties of metal and ceramics, such as high elastic modulus, good thermal conductivity, electrical conductivity and excellent thermal shock resistance, and it has good oxidation resistance and corrosion resistance. These advantages of MAX phase ceramic materials enable them to serve stably in the environment of high temperature, strong corrosion and presence of oxygen. [0003] Nitride ceramic materials (Si 3 N 4 , AlN) has a series of excellent characteristics such as high thermal conductivity, good thermal shock resistance, high insulation coefficient, high wear resistance, excellent mechanical properties and chemical stabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/584C04B35/582C04B35/581C04B35/622
CPCC04B35/5615C04B35/5618C04B35/58014C04B35/581C04B35/584C04B35/622C04B2235/666C04B2235/6562B32B18/00C04B2237/58C04B2237/36C04B2237/368
Inventor 史忠旗刘思雨刘丹桂宁晓辉
Owner XI AN JIAOTONG UNIV
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