A high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method

A composite material, strontium feldspar technology, applied in the field of high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation, can solve the problems of low density, low thermal expansion coefficient, limited application of strontium feldspar, poor processability, etc. Achieve high density, inhibit abnormal grain growth, good dielectric and high temperature resistance

Active Publication Date: 2021-06-25
HARBIN INST OF TECH
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  • 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 high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method
  • A high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material and its preparation method
  • A high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material 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 high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material and the preparation method of the composite material, see figure 1 As shown, wherein the preparation method of high temperature resistant boron nitride-strontium feldspar ceramic matrix composite material comprises the following steps:

[0033] S1: weighing strontium feldspar powder and hexagonal boron nitride powder and mixing to obtain raw materials;

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

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

[0036] S4: Put the raw material powder into a graphite mold after sieving, and perform cold pressing to obtain a block raw material;

[0037] S5: performing discharge plasma sintering on the obtained bulk raw material to obtain a high temperature resistant boron ...

Embodiment 1

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

[0061] S1: Weighing 77.35 g of strontium feldspar powder with a particle size of 200 mesh and 13.68 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99 wt%, and mixing them to obtain raw materials;

[0062] S2: placing the obtained raw materials in a polytetrafluoroethylene ball milling tank, using alumina balls as a ball milling medium, adding absolute ethanol to carry out wet ball milling for 24 hours to obtain a ball milling powder;

[0063] S3: stirring and drying the ball-milled powder at 60° C. for 4 hours to obtain raw material powder;

[0064] S4: Pass the raw material powder through a 100-mesh sieve, put it into a graphite mold, and cold press it at a pressure of 30 MPa for 3 minutes to obtain a block raw material;

[0065] S5: performing discharge plasma si...

Embodiment 2

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

[0078] S1: 56.4 g of strontium feldspar powder with a particle size of 200 mesh was weighed and mixed with 37.6 g of hexagonal boron nitride powder with a particle size of 100 mesh and a purity of 99 wt%, to obtain raw materials;

[0079] S2: placing the obtained raw materials in a polytetrafluoroethylene ball milling tank, using alumina balls as a ball milling medium, adding absolute ethanol to carry out wet ball milling for 12 hours to obtain a ball milling powder;

[0080] S3: stirring and drying the ball-milled powder at 60° C. for 6 hours to obtain raw material powder;

[0081] S4: Put the raw material powder through a 100-mesh sieve and put it into a graphite mold with an inner diameter of 20 mm and a boron nitride-coated inner wall, and cold press it at a pressure of 15 MPa for 5 minutes to obtai...

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Abstract

The invention discloses a high-temperature-resistant boron nitride-strontium feldspar ceramic-based composite material and a preparation method thereof, and relates to the technical field of preparation of ceramic-based composite materials. The preparation method includes: S1: weighing strontium feldspar powder and hexagonal Boron nitride powders are mixed to obtain raw materials; S2: ball mill the raw materials to obtain ball milled powders; S3: stir and dry the ball milled powders to obtain raw material powders; S4: put the raw material powders into graphite In the mold, cold pressing is carried out to obtain a block raw material; S5: performing discharge plasma sintering on the block raw material to obtain a high-temperature resistant boron nitride-strontium feldspar ceramic matrix composite material. The preparation method of the high-temperature-resistant boron nitride-strontium feldspar ceramic-based composite material provided by the present invention introduces boron nitride into strontium feldspar, so that the prepared boron nitride-strontium feldspar ceramic-based composite material not only has good Mechanical and machinable properties, at the same time, it also has good dielectric and high temperature resistance properties.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic-based composite materials, in particular to a high-temperature-resistant boron nitride-strontium feldspar ceramic-based 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/622C04B35/64
CPCC04B35/195C04B35/622C04B35/64C04B2235/386C04B2235/666
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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