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an al 2 o 3 -ti 3 alc 2 Gradient ceramic and preparation method thereof

A ceramic and gradient technology is applied in the field of Al2O3-Ti3AlC2 gradient ceramics and its preparation, which can solve the problems of delamination, thermal shock resistance, local segregation and other problems, and achieves simple sintering preparation, low synthesis cost and low cost low effect

Active Publication Date: 2022-07-12
LIAONING SILICATE RES INST
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Problems solved by technology

At present, most gradient ceramics are prepared by multi-layer structure design, or materials with different composition ratios inside and outside. This preparation method has serious layering of ceramics, and local segregation is easy to occur. It is difficult to achieve a gradual and continuous distribution structure inside the ceramic. , will have a huge impact on the strength, toughness, thermal conductivity, and thermal shock resistance of ceramic materials.

Method used

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  • an al <sub>2</sub> o <sub>3</sub> -ti <sub>3</sub> alc <sub>2</sub> Gradient ceramic and preparation method thereof
  • an al <sub>2</sub> o <sub>3</sub> -ti <sub>3</sub> alc <sub>2</sub> Gradient ceramic and preparation method thereof

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preparation example Construction

[0035] The technical scheme of the present invention is as follows: the present invention provides a kind of Al 2 O 3 -Ti 3 AlC 2 The preparation method of gradient ceramics comprises the following steps:

[0036] (1) Crushing of raw materials: Al with a purity of 99.95% is crushed by a crushing sampler. 2 O 3 and 98% pure Ti 3 AlC 2 respectively crushed to the range of 0.1-10 μm to form Al 2 O 3 Micron powder and Ti 3 AlC 2 micron powder;

[0037] (2) Mixing injection molding: prepare alumina granulated powder, Al 2 O 3 and Ti 3 AlC 2 Micron powder composite granulation powder with a weight ratio of 1.5-4:1, Al 2 O 3 and Ti 3 AlC 2 Micron powder composite granulation powder and Ti with a weight ratio of 1:1.5-4 3 AlC 2 The granulated powder, marked A, B, C, D respectively, is mixed according to the weight ratio of 1:1:1:1, and injection-molded;

[0038] (3) Forming: The granulated powder mixed with injection molding is once formed by dry pressing, the for...

Embodiment 1

[0057] Weigh 320gTi 3 AlC 2 Coarse powder, 60g high-purity alumina micron powder were put into crushing sampler and crushed for 15 minutes to obtain Al of 1-10μm 2 O 3 Micron powder and Ti 3 AlC 2 Micron powder.

[0058] Weigh 160g of alumina granulation powder and record it as sample A;

[0059] Weigh the broken Al 2 O 3 and Ti 3 AlC 2 100g and 50g of micron powder, add 0.6g of micron aluminum powder, then add 8g gum arabic and 82g deionized water, mix and stir for 4h, carry out spray granulation, and recover 200-250 mesh granulated powder as sample B.

[0060] Also do not call broken Al 2 O 3 and Ti 3 AlC 2 50g and 100g of micron powder, add 1g of micron aluminum powder, then add 8g gum arabic and 82g deionized water, mix and stir for 4h, carry out spray granulation, and recover 200-250 mesh granulated powder as sample C.

[0061] Weigh 160g of Ti 3 AlC 2 Micron crushed powder, add 90 g of 10% gum arabic solution, add 160 g of silica balls, ball mill for 2 ho...

Embodiment 2

[0065] Weigh 400gTi 3 AlC 2 Coarse powder and 200g of high-purity alumina micron powder were put into the crushing sampler and crushed for 20 minutes to obtain 0.5-10μm micron powder.

[0066] Weigh 200g of alumina 250-325 mesh granulated powder and record it as sample A;

[0067] Weigh the broken Al 2 O 3 and Ti 3 AlC 2 120g and 30g of micron powder, add 0.6g micron aluminum powder, then add 10g gum arabic and 90g deionized water, mix and stir for 3h, carry out spray granulation, and recover 250-325 mesh granulated powder as sample B;

[0068] Also weigh the broken Al 2 O 3 and Ti 3 AlC2 30g and 120g of micron powder, add 1g of micron aluminum powder, then add 8g gum arabic and 82g deionized water, mix and stir for 4h, carry out spray granulation, and reclaim 250-325 mesh granulated powder as sample C;

[0069] Weigh 200g of Ti 3 AlC2 micron crushed powder, add 120g of aqueous solution containing 15% gum arabic, add 200g of silica balls, ball mill for 3h, dry at 100...

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Abstract

The invention belongs to a kind of Al 2 O 3 ‑Ti 3 AlC 2 Material preparation technology, specifically involving a kind of Al 2 O 3 ‑Ti 3 AlC 2 Gradient ceramics and methods of making the same. The specific steps are as follows: 1. Use a crushing sample machine to make Al 2 O 3 and homemade 98% pure Ti 3 AlC 2 Fragmentation to the 0.1‑10μm range to form Al 2 O 3 Micron powder and Ti 3 AlC 2 Micron powder; powder granulation: 2. Prepare four kinds of granulated powder, take alumina granulated powder, Al 2 O 3 and Ti 3 AlC 2 The composite granulation powder is granulated according to the ratio of 1.5-4): 1, Al 2 O 3 and Ti 3 AlC 2 The composite granulation powder is granulated according to 1:1.5-4, Ti 3 AlC 2 Granulated powder Four kinds of granulated powder are mixed and mixed in a rotary mixer, discharged to the mold so that the discharged material can evenly spread the surface of the mold, and then dry-pressed and sintered under pressure to obtain Al 2 O 3 ‑Ti 3 AlC 2 Gradient ceramics. The advantages of the present invention are: (1) the reaction sintering process is simple and the cost is low; (2) the gradient ceramic components are distributed continuously, and there is no obvious interface layer.

Description

technical field [0001] The invention belongs to a kind of Al 2 O 3 -Ti 3 AlC 2 Material preparation technology, specifically involving a kind of Al 2 O 3 -Ti 3 AlC 2 Gradient ceramics and methods of making the same. Background technique [0002] Al 2 O 3 Ceramics are currently the most used ceramics in high temperature oxidizing environments. They have the advantages of high temperature resistance, high hardness, high compressive strength, low density, and high insulation. They are widely used in the aerospace field. , but due to the poor fracture toughness, thermal conductivity and thermal shock resistance of alumina ceramics, with the development of aerospace technology, a single Al 2 O 3 It is difficult for ceramics to adapt to the working conditions of large temperature difference or different high and low temperature at both ends. [0003] Ti 3 AlC 2 is M 3 AX 2 A new type of cermet in the system. On the one hand, it has metal-like properties such as ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/56C04B35/626C04B35/64
Inventor 刘博周岩许成杨殿来许壮志薛健
Owner LIAONING SILICATE RES INST
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