A boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and its preparation method

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 low density, low thermal expansion coefficient, limited application of strontium feldspar, poor processability, etc. question

Active Publication Date: 2021-07-06
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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  • A boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and its preparation method
  • A boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and its preparation method
  • A boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and its preparation method

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preparation example Construction

[0032] In order to solve the problem of poor machinability of strontium feldspar, the present invention provides a boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection and a preparation method of the composite material, see figure 1 As shown, wherein the preparation method of the 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 bulk raw material to obtain a boron nitride-strontium feldspar ceramic matrix composite materia...

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 includes:

[0064] S1: Weighing 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 mixing 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 performing wet ball milling with alumina balls 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] The difference from Example 1 is that the preparation method of the boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection provided in this example includes:

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

[0082] S2: Put the obtained raw material powder in a polytetrafluoroethylene ball mill tank, add absolute ethanol, and perform wet ball milling with alumina balls for 12 hours to obtain ball mill 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 block raw material; ...

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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 thereof, and relates to the field of preparation of ceramic-based composite materials. The preparation method of the composite material includes: S1: weighing strontium feldspar Mix the powder with hexagonal boron nitride powder to obtain a raw material powder; S2: ball mill the raw material powder to obtain a ball milled powder; S3: stir and dry the ball milled powder to obtain a raw material powder; S4: Cold pressing the raw material powder to obtain a block raw material; S5: hot pressing and sintering the block raw material to obtain a boron nitride-strontium feldspar ceramic matrix composite material for aerospace heat protection. The preparation method of the boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection provided by the present invention makes the prepared boron nitride-strontium feldspar ceramic-based composite material ensure the dielectric properties of the boron nitride-strontium feldspar Strontium feldspar ceramic matrix composites have good mechanical properties and machinability.

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 Patents(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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