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Boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material and preparation method thereof

A high-temperature wave-transmitting, multi-phase ceramic technology is applied in the field of preparation of ceramic matrix composite materials, which can solve the problems of limited application of strontium feldspar, low density and low thermal expansion coefficient, poor machinability, etc. Processability, effect of improving strength and toughness

Active Publication Date: 2019-04-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Strontium feldspar has the advantages of low density, small thermal expansion coefficient, good high temperature stability, excellent dielectric properties and excellent chemical stability. It has a wide range of application prospects; however, due to the excellent thermal and dielectric properties of strontium feldspar, it also has the characteristics of poor processability, which greatly limits the application of strontium feldspar in practical engineering

Method used

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  • Boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material and preparation method thereof
  • Boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material and preparation method thereof
  • Boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material and preparation method thereof

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preparation example Construction

[0033] In order to solve the problem of poor workability of strontium feldspar, the present invention provides a boron nitride-strontium feldspar high-temperature wave-transmitting composite ceramic material and a preparation method of the composite ceramic material, see figure 1 As shown, the preparation method of the boron nitride-strontium feldspar high-temperature wave-transmitting composite ceramic material includes the following steps:

[0034] S1: Weigh and mix strontium feldspar powder and hexagonal boron nitride powder to obtain raw material powder;

[0035] S2: ball mill the raw material powder to obtain ball mill powder;

[0036] S3: Stir and dry the obtained ball mill powder to obtain raw material powder;

[0037] S4: Cold pressing the raw material powder to obtain a raw material body;

[0038] S5: Hot isostatic pressing and sintering of the raw material body to obtain a high-temperature wave-transmitting composite ceramic material of boron nitride-strontium feldspar.

[0039...

Embodiment 1

[0063] This embodiment provides a method for preparing a boron nitride-strontium feldspar high-temperature wave-transmitting composite ceramic material. The preparation method includes:

[0064] S1: Weigh 155.25 g of strontium feldspar powder with a particle size of 200 mesh and 72.45 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99% by weight and mix them to obtain a raw material powder;

[0065] S2: Place the raw material powder in a polytetrafluoroethylene ball mill tank, use alumina balls, and add absolute ethanol for wet ball milling for 24 hours to obtain ball mill powder;

[0066] S3: Stir and dry the obtained ball mill powder at 60° C. for 24 hours and then pass through a 100 mesh sieve to obtain raw material powder;

[0067] S4: Pour the raw material powder into a steel mold with a diameter of 50 mm and a boron nitride coated inner wall and cold press at a pressure of 15 MPa for 3 minutes to obtain a raw material body;

[0068] S5: Hot iso...

Embodiment 2

[0081] The difference from the first embodiment is that this embodiment provides a method for preparing a boron nitride-strontium feldspar high-temperature wave-transmitting composite ceramic material. The preparation method includes:

[0082] S1: Weigh 16.75 g of strontium feldspar powder with a particle size of 200 mesh and 50.25 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99% by weight, and mix them to obtain a raw material powder;

[0083] S2: Place the raw material powder in a polytetrafluoroethylene ball mill tank, use alumina balls, and add absolute ethanol for wet ball milling for 24 hours to obtain ball mill powder;

[0084] S3: Stir and dry the obtained ball mill powder at 60° C. for 24 hours and then pass through a 100 mesh sieve to obtain raw material powder;

[0085] S4: Pour the raw material powder into a steel mold with a diameter of 50 mm and a boron nitride coated inner wall and cold press at a pressure of 15 MPa for 3 minutes t...

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Abstract

The invention discloses a boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material and a preparation method thereof, and relates to the preparation field of ceramic matrix composite material. The preparation method of the boron nitride-strontium feldspar high-temperature wave-transparent composite ceramic material comprises the following steps of: S1: mixing strontium feldspar powder and hexagonal boron nitride powder to obtain raw material powder; S2: ball-milling the raw material powder to obtain ball-milling powder; S3: stirring and drying the ball-milling powder to obtain the raw material powder; S4: cold-pressing the raw material powder to obtain a raw material body; and S5: carrying out hot isostatic pressing and sintering on the raw material bodyto obtain the boron nitride-strontium feldspar high-temperature wave-transparent composite ceramic material. By the adoption of the preparation method of the boron nitride-strontium feldspar high temperature wave-transparent composite ceramic material, hexagonal boron nitride is introduced into the strontium feldspar, so that the composite ceramic material not only has good machinability, but also has good dielectric and high temperature resistance.

Description

Technical field [0001] The invention relates to the field of preparation of ceramic matrix composite materials, in particular to a boron nitride-strontium feldspar high-temperature wave-transmitting composite ceramic material and a preparation method thereof. Background technique [0002] Strontium feldspar has the advantages of low density, low thermal expansion coefficient, good high temperature stability, excellent dielectric properties and excellent chemical stability. It is used in many fields such as aviation, aerospace industry, automobile, environmental protection, metallurgy, chemical industry and electronics industry. It has a wide range of application prospects; but because strontium feldspar has excellent thermal and dielectric properties, it also has the characteristics of poor workability, which greatly limits the application of strontium feldspar in practical engineering. [0003] In view of the foregoing defects, the creator of the present invention finally obtained...

Claims

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Application Information

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IPC IPC(8): C04B35/195C04B35/583C04B35/622C04B35/645
CPCC04B35/195C04B35/583C04B35/622C04B35/6455C04B2235/3481C04B2235/386C04B2235/5427C04B2235/602C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/658
Inventor 蔡德龙贾德昌杨治华段小明何培刚王胜金周玉
Owner HARBIN INST OF TECH
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