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Boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and preparation method of composite material

A technology of composite materials and strontium feldspar, which is applied in the field of boron nitride-strontium feldspar ceramic matrix composite materials for aerospace heat protection and its preparation, can solve the problems of restricting the application of strontium feldspar, low density thermal expansion coefficient, poor processability, etc. problems, to achieve good mechanical properties and machinability, improve machinability, and high density

Active Publication Date: 2019-05-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 ceramic-based composite material for aerospace heat protection and preparation method of composite material
  • Boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and preparation method of composite material
  • Boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and preparation method of composite material

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preparation example Construction

[0032] In order to solve the problem of poor machinability of strontium feldspar, the invention provides a boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and the preparation method of the composite material, see figure 1 As shown, wherein the preparation method of boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection comprises the following steps:

[0033] S1: Weighing the strontium feldspar powder and mixing the hexagonal boron nitride powder to obtain the raw material powder;

[0034] S2: ball milling the obtained raw material powder to obtain ball milling powder;

[0035] S3: stirring and drying the ball mill powder to obtain raw material powder;

[0036] S4: cold pressing the raw material powder to obtain bulk raw material;

[0037] S5: Hot pressing and sintering the obtained block raw materials to obtain boron nitride-strontium feldspar ceramic matrix composite materials for aer...

Embodiment 1

[0063] This embodiment provides a method for preparing a boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection, the preparation method comprising:

[0064] S1: Weigh 52 g of strontium feldspar powder with a particle size of 200 mesh and 36.8 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99 wt%, and mix them to obtain a raw material powder;

[0065] S2: placing the obtained raw material powder in a polytetrafluoroethylene ball milling tank, adding absolute ethanol, and using alumina balls to carry out wet ball milling for 24 hours to obtain a ball milling powder;

[0066] S3: stirring and drying the ball-milled powder at 60° C. for 24 hours to obtain raw material powder;

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

...

Embodiment 2

[0080] Different from Example 1, the preparation method of the boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection provided in this example includes:

[0081] S1: Weigh 62 g of strontium feldspar powder with a particle size of 200 mesh and mix with 10.9 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99 wt%, to obtain a raw material powder;

[0082] S2: The obtained raw material powder is placed in a polytetrafluoroethylene ball milling jar, absolute ethanol is added, and alumina balls are used to carry out wet ball milling for 12 hours to obtain a ball milling powder;

[0083] S3: stirring and drying the ball-milled powder at 60° C. for 48 hours to obtain raw material powder;

[0084] S4: Pour the obtained raw material powder into a graphite mold with a diameter of 50 mm and an inner wall coated with boron nitride, and cold press at a pressure of 15 MPa for 3 minutes to obtain a bulk raw materia...

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Abstract

The invention discloses a boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and a preparation method of the composite material, and relates to the field of ceramic-based composite materials. The preparation method of the composite material includes the steps: S1 weighing and mixing strontium feldspar powder and hexagonal boron nitride powder to obtainraw material powder; S2 ball-milling the raw material powder to obtain ball-milled powder; S3 stirring and drying the ball-milled powder to obtain raw material powder; S4 cold-pressing the raw material powder to obtain bulk raw materials; S5 hot-pressing and sintering the bulk raw materials to obtain the boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection. According to the preparation method of the boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection, on the premise of ensuring the dielectric property of theboron nitride-strontium feldspar ceramic-based composite material, the prepared boron nitride-strontium feldspar ceramic-based composite material has good mechanical and machinable properties.

Description

technical field [0001] The invention relates to the field of preparation of ceramic-based composite materials, in particular to a boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and a preparation method thereof. Background technique [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 wide application prospects; however, due to its excellent thermal and dielectric properties, strontium feldspar also has the characteristics of poor processability, which greatly limits the application of strontium feldspar in practical engineering. [0003] In view of the above-mentioned defects, the creator of the present invention has finally obtained the present invention through long-term research and practice. Contents of the invention [0004] In order to solve the above-mentioned techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5835C04B35/195C04B35/645
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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