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Boron nitride ceramic as well as preparation method and preparation equipment thereof

A boron nitride and boron nitride powder technology, applied in the field of ceramics, can solve the problem of low density and achieve the effect of reducing adverse effects

Inactive Publication Date: 2019-05-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a boron nitride ceramic to solve the problem of low density of the existing boron nitride ceramic

Method used

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  • Boron nitride ceramic as well as preparation method and preparation equipment thereof
  • Boron nitride ceramic as well as preparation method and preparation equipment thereof
  • Boron nitride ceramic as well as preparation method and preparation equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A boron nitride ceramic, in terms of mass fraction, is sintered by 95% boron nitride powder and 5% boron oxide powder through the dual heating mode of current heating and radiation heating, wherein the boron nitride powder It is h-BN, namely hexagonal boron nitride.

[0032] The preparation method of above-mentioned boron nitride ceramics specifically comprises the following steps:

[0033] 1) Take 25g of boron nitride powder and boron oxide powder according to the above ratio, and put it into a ball ink tank made of polytetrafluoroethylene, to carry out ball milling to it, wherein, the ball milling process The ball milling medium is anhydrous ethanol, the ball-to-material ratio of ball milling is 7:1, and the ball milling mixing time is 12 hours. After the ball milling and mixing is completed, it is fully dried, and then passed through a 200-mesh sieve to obtain a blank, that is, the sieved powder;

[0034] 2) Put the billet into a graphite mold with a diameter of Ф19...

Embodiment 2

[0042] The difference between this embodiment and the above-mentioned embodiments is that the power ratio of the current sintering equipment and the radiation heating device is preferably 3:2, that is, the heating power of the current sintering equipment and the radiation heating device is preferably 60kw and 40kw respectively; the sintering temperature rise rate of sintering 120°C / min.

[0043] The boron nitride ceramics of this embodiment is analyzed by scanning electron microscope, and the test results are as follows: figure 2 shown.

[0044] Depend on figure 2 It can be seen that the boron nitride ceramic structure of this embodiment is relatively dense.

[0045] The density and compactness of the boron nitride ceramics in this embodiment were tested.

[0046] It can be known from tests that the density of the boron nitride ceramics in this embodiment is 2.1519g / cm 3 , the density is 93.64%.

Embodiment 3

[0048] The difference between this embodiment and the above embodiment is that: the mass fraction of boron nitride powder is 97%, the mass fraction of boron oxide powder is 3%; the power ratio of the current sintering equipment and the radiation heating device is preferably 3:2, That is, the heating power of the current sintering equipment and the radiation heating device are preferably 60kw and 40kw respectively; the sintering temperature rise rate of sintering is 120°C / min.

[0049] The boron nitride ceramics of this embodiment is analyzed by scanning electron microscope, and the test results are as follows: image 3 shown.

[0050] Depend on image 3 It can be seen that the boron nitride ceramic structure of this embodiment is relatively dense.

[0051] The density and compactness of the boron nitride ceramics in this embodiment were tested.

[0052]It can be seen from tests that the density of the boron nitride ceramics in this embodiment is 2.1109g / cm 3 , the density ...

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Abstract

The invention provides a boron nitride ceramic as well as a preparation method and preparation equipment thereof. The boron nitride ceramic is prepared from 95 to 99 percent of boron nitride powder and 1 to 5 percent of boron oxide powder in percent by mass through double-heating-mode sintering including current heating and radiation heating. The boron nitride ceramic uses the double heating modesof current heating and radiation heating for sintering the boron nitride powder and the boron oxide powder; the temperature differences in the boron nitride ceramic sintering process can be effectively controlled, so that in the boron nitride ceramic process, the uniform temperature field is realized; the boron nitride ceramic with the diameter being greater than 30mm and the high compactness canbe favorably sintered in a short time; the density can reach 2.1862g / cm<3>; the compactness can reach 95.14 percent. The boron oxide is used as sintering auxiliary agents, so that the adverse influence caused on the sintering process by a room clamp type structure generated by the material per se in the sintering process can be reduced.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a boron nitride ceramic and its preparation method and preparation equipment. Background technique [0002] The ceramic materials often used under high temperature conditions are mostly boride ceramics, carbide ceramics, nitride ceramics, etc. Boron nitride ceramics, as a ceramic material with excellent performance and great development potential, has been paid close attention to. Boron nitride is a covalently bonded compound formed by the combination of nitrogen and boron, and has four crystal structures: hexagonal, cubic, rhombohedral and wurtzite. Hexagonal boron nitride has excellent high temperature resistance, good thermal stability, excellent chemical stability and precision machining, and has been widely used in many fields such as electronics, aerospace, metallurgy, etc., but as a covalent compound, It has a high melting point, low solid-phase diffusion coefficient, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/622C04B35/64F27D11/02
Inventor 王玉成周灿张金咏张帆傅正义王为民
Owner WUHAN UNIV OF TECH