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Preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ synthesized oxide nanometer composite ceramics

A multi-phase ceramic, in-situ self-generating technology, applied in the field of ceramic materials, can solve the problem that the performance of nano-multi-phase ceramics is not as strong and tough as that of nano-two-phase particles, and achieves simple process route and preparation method, high bearing capacity and wide technical route. Effect

Active Publication Date: 2019-01-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of highly oriented nano MAX phase ceramics and MAX phase in-situ self-generated oxide nano-composite ceramics, to solve the problem that the performance of existing nano-composite ceramics is not as good as that of in-situ growth on nano-ceramic substrates with a phase interface Matching nano-two-phase particles to strengthen and toughen ceramics, etc.

Method used

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  • Preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ synthesized oxide nanometer composite ceramics
  • Preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ synthesized oxide nanometer composite ceramics
  • Preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ synthesized oxide nanometer composite ceramics

Examples

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Effect test

Embodiment 1

[0049] In this example, the preparation method of highly oriented nano MAX phase ceramics and MAX phase in situ self-generated oxide nanocomposite ceramics is as follows:

[0050] Weigh 200 grams of product name Ti 2 The nano MAX phase ceramic lamellar powder of AlC has a particle size of 180 nanometers and an oxygen content of 8% by mass. Directly put the nanosheet powder into the graphite mold, adopt the hot-press sintering method, hot-press sinter in the graphite mold, the sintering temperature is 1250°C, the sintering pressure is 50MPa, the holding time is 60 minutes, the heating rate is 5°C / min, and the sintering atmosphere is vacuum. Ti obtained after sintering 2 AlC / Al 2 o 3 In the nanocomposite phase ceramics, the alumina content accounts for 12% of the mass fraction of the material. The compressive strength of the material reaches 2200MPa, much higher than ordinary Ti 2 The strength of AlC is 400~1000MPa, and the fracture toughness is 8~9MPa.m 1 / 2 , much higher...

Embodiment 2

[0056] In this example, the preparation method of highly oriented nano MAX phase ceramics and MAX phase in situ self-generated oxide nanocomposite ceramics is as follows:

[0057] Weigh 500 grams and the product name is Ti 3 AlC 2 The nanometer MAX phase ceramic sheet powder, the particle size of the powder is 200 nanometers, and the mass fraction of oxygen in the powder is 5%. Directly put the nanosheet powder into the stainless steel sheath, and vacuumize and seal the sheath. Put the sealed package into a hot isostatic pressing furnace for sintering, the sintering temperature is 1100°C, the sintering pressure is 200MPa, the holding time is 120 minutes, the heating rate is 5°C / min, and the sintering atmosphere is argon. Ti obtained after sintering 3 AlC 2 / Al 2 o 3 Nano-composite ceramics, the content of alumina accounts for 8% of the mass fraction of the material, the compressive strength of the material reaches 1800MPa, and the fracture toughness is 14-17MPa.m 1 / 2 , ...

Embodiment 3

[0062] In this example, the preparation method of highly oriented nano MAX phase ceramics and MAX phase in situ self-generated oxide nanocomposite ceramics is as follows:

[0063] Weigh 1 kg and name it Ti 3 SiC 2 The nanometer MAX phase ceramic sheet powder, the mass fraction of oxygen in the powder is 6%, and the particle size of the powder is 80 nanometers. Put the nano-powder into the aluminum alloy cold isostatic pressing sheath, then vacuumize and seal the sheath, and densify it in the sheath by cold isostatic pressing, the cold isostatic pressing temperature is 400°C, and the cold isostatic pressing pressure is 250MPa , the holding time is 360 minutes, and the heating rate is 5°C / min. The powder compacted product is then removed from the casing. Put the pressed green body into an alumina crucible and send it to a vacuum furnace for sintering. The sintering temperature is 1300°C and the sintering time is 180 minutes. Ti obtained after sintering 3 AlC 2 / SiO 2 Nano...

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Abstract

The invention relates to the field of ceramic material, and particularly relates to a preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ synthesized oxide nanometer composite ceramics. Nanometer lamellar powder of the MAX phase ceramics or an embryo formed by the nanometer lamellar powder is adopted as the material, the granularity of nanometer lamellar particles of the MAX phase ceramics in the powder or the embryo is between 20-400 nanometers, and the oxygen content is between 0.0001%-20% mass fraction; MAX phase grains in ceramics obtained after sintering of the material is lamellar or cambiform, and lamellar grains has high orientation. According to the invention, orientation is generated by pressurized deformation by utilizing the special characteristic of the nanometer lamellar MAX powder, so as to obtain a lamellar structure similar to that in a natural pearl shell; such structure, like brick fragments used for building, has very high forcebearing capacity and resistance to external load and crack expansion.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a preparation method of highly oriented nanometer MAX phase ceramics and MAX phase in-situ self-generated oxide nanocomposite ceramics. Background technique [0002] MAX phase ceramics (such as: Ti 3 SiC 2 、Ti 2 AlC, Nb 2 AlC, etc.) is a class of machinable ceramics with a nanometer ternary layered structure and many unique and excellent properties. Its crystal structure can be described as: a pure A atomic layer is inserted into a crystalline close-packed M atomic clock, and X atoms are filled into the M composition. in the octahedral gap. Wherein, the M atom refers to a transition group metal element, the A atom is a group A element, and the X atom can be C and N elements. Ceramics with this crystal structure have covalent bonds, metal bonds, and ionic bonds at the same time, so they have both the properties of ceramics and metals. Such as: high melting point, anti-oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5618C04B35/622C04B2235/786C04B2235/96C04B2235/5454C04B2235/6562C04B2235/6581C04B2235/6567C04B2235/3418C04B2235/3217C04B35/5615C04B35/6455C04B2235/3817C04B2235/3826C04B2235/3843C04B2235/5445C04B2235/666C04B2235/785C04B2235/85C04B2235/787C04B35/645C04B2235/3895C04B2235/80C04B2235/604C04B2235/668C04B2235/788C04B2235/5292C04B2235/663C04B2235/781
Inventor 崔玉友谢曦柏春光杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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