A thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method

A composite material and boron nitride technology are applied in the field of thermal shock boron nitride-strontium feldspar ceramic matrix composite materials and their preparation, which can solve the problems of limited application of strontium feldspar, poor machinability, low density and low thermal expansion coefficient, etc. , to achieve the effect of good mechanical and processability, high density, good dielectric and thermal shock resistance

Active Publication Date: 2021-06-25
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 thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method
  • A thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method
  • A thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method

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preparation example Construction

[0033] In order to solve the problem of poor machinability of strontium feldspar, the present invention provides a thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material and a preparation method of the composite material, see figure 1 As shown, wherein the preparation method of thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material comprises the following steps:

[0034] S1: Weigh h-BN powder, SrCO 3 Powder, Al 2 o 3 Powder and SiO 2 powder and mix to obtain raw material powder;

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

[0036] S3: stirring and drying the ball mill powder to obtain raw material powder;

[0037] S4: Put the raw material powder into a graphite mold and perform cold pressing to obtain a bulk raw material;

[0038] S5: Sintering the bulk raw material to prepare a thermal shock resistant boron nitride-strontium feldspar ceramic matrix composite mate...

Embodiment 1

[0060] This embodiment provides a method for preparing a thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material, the method comprising:

[0061] S1: Weigh 23g of h-BN powder with a particle size of 100 mesh and a purity of 99wt%, and SrCO with a particle size of 100 mesh and a purity of 99.5wt%. 3 Powder 14.83g, particle size is 100 mesh, purity is 99.5wt% Al 2 o 3 Powder 10.88g, particle size is 100 orders, the SiO that purity is 99.5wt% 2 Powder 13.09g, mix, make raw material powder;

[0062] S2: Put the raw material powder in a polytetrafluoroethylene ball mill tank, use alumina balls, add absolute ethanol to carry out wet ball milling for 1 hour, and obtain a ball mill powder;

[0063] S3: stirring and drying the ball mill powder at 60° C. for 24 hours to obtain raw material powder;

[0064] S4: Put the raw material powder into a graphite mold with a diameter of 50 mm and the inner wall is coated with boron nitride, and cold press at...

Embodiment 2

[0077] This embodiment provides a method for preparing a thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material, the method comprising:

[0078] S1: Weigh 8.2g of h-BN powder with a particle size of 200 mesh and a purity of 99wt%, and SrCO with a particle size of 200 mesh and a purity of 99.5wt%. 3 Powder 7.34g, particle size is 200 orders, and purity is the Al of 99.5wt%. 2 o 3 Powder 10.88g, particle size is the SiO of 200 orders, purity is 99.5wt% 2 Powder 13.09g, mix, make raw material powder;

[0079] S2: Put the raw material powder in a polytetrafluoroethylene ball mill tank, use alumina balls, add absolute ethanol to carry out wet ball milling for 12 hours to obtain a ball mill powder;

[0080] S3: stirring and drying the ball mill powder at 60° C. for 36 hours to obtain raw material powder;

[0081] S4: Put the raw material powder into a graphite mold with a diameter of 50 mm and an inner wall coated with boron nitride, and cold ...

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Abstract

The invention discloses a thermal shock-resistant boron nitride-strontium feldspar ceramic-based composite material and a preparation method thereof, and relates to the technical field of ceramic-based composite materials. The preparation method includes: S1: weighing h-BN powder, SrCO 3 Powder, Al 2 o 3 Powder and SiO 2 powder and mix to obtain a raw material powder; S2: ball mill the raw material powder to obtain a ball mill powder; S3: stir and dry the ball mill powder to obtain a raw material powder; S4: grind the raw material powder Putting it into a graphite mold and performing cold pressing to obtain a bulk raw material; S5: Sintering the bulk raw material to obtain a thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material. The preparation method of the thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material provided by the present invention introduces boron nitride into the strontium feldspar, and improves the strontium feldspar without affecting the dielectric properties of the strontium feldspar itself. machinability.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to a thermal shock-resistant boron nitride-strontium feldspar ceramic matrix composite material 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 technical defec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/583C04B35/195C04B35/622
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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