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Orientation heat transfer hexagonal boron nitride/cordierite textured ceramic and preparation method thereof

A technology of hexagonal boron nitride and cordierite, which is applied in the field of textured ceramics and its preparation, can solve the problems of low thermal conductivity and poor heat protection effect, and achieves improved directional heat transfer, simple process and obvious directional heat transfer characteristics. Effect

Pending Publication Date: 2018-10-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a directional heat transfer hexagonal nitriding in order to solve the problem of poor heat resistance caused by the small difference in thermal conductivity between the direction perpendicular to the lamellar direction and the direction parallel to the lamellar layer of the existing h-BN textured ceramics. Boron / cordierite textured ceramics and preparation method thereof

Method used

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  • Orientation heat transfer hexagonal boron nitride/cordierite textured ceramic and preparation method thereof

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specific Embodiment approach 1

[0025] Specific embodiment one: In this embodiment, the directional heat transfer hexagonal boron nitride / cordierite textured ceramic consists of 60-90% h-BN powder, 1.38-5.52% MgO powder, 3.49-13.96% Nano-Al 2 o 3 powder and the rest of the fused silica powder.

[0026] The principles and beneficial effects of this embodiment are:

[0027] In order to overcome the problem that the directional heat transfer characteristics of h-BN ceramic matrix composite materials for high temperature are not obvious, this embodiment adds MgO powder, Al 2 o 3 Hexagonal boron nitride / cordierite textured ceramics with texture characteristics are prepared by hot-pressing sintering technology, which can improve the degree of h-BN grain orientation, so that h-BN ceramics can conduct heat in a directional manner, and then Improves its heat resistance.

[0028] 1. In this embodiment, MgO powder and Al are added to h-BN powder 2 o 3 powder and fused silica powder, through MgO, Al 2 o 3 In si...

specific Embodiment approach 2

[0032] Specific embodiment 2: The preparation method of directional heat transfer hexagonal boron nitride / cordierite textured ceramics in this embodiment is carried out according to the following steps:

[0033] 1. Weigh 60-90% of h-BN powder, 1.38-5.52% of MgO powder, and 3.49-13.96% of nano-Al according to mass fraction 2 o 3 The powder and the rest of the fused silica powder are used as raw materials; the raw materials are mixed and then dried by rotary evaporation and sieved to obtain a mixed powder;

[0034] 2. Put the mixed powder into the graphite mold, place the graphite mold on the press for pre-pressing treatment, and obtain the green body;

[0035] 3. Put the pre-pressed green body and the graphite mold together in a hot-press furnace for hot-press sintering, and the process is completed.

[0036] The principles and beneficial effects of this embodiment are:

[0037] In order to overcome the problem that the directional heat transfer characteristics of h-BN ceram...

specific Embodiment approach 3

[0042] Embodiment 3: This embodiment differs from Embodiment 2 in that: the sieve used in step 1 is larger than 80 mesh. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention relates to an orientation heat transfer hexagonal boron nitride / cordierite textured ceramic and a preparation method thereof, in particular to textured ceramic and a preparation method thereof. The invention aims to solve the problem of small heat conductivity difference between a direction of the h-BN textured ceramic perpendicular to a slice layer and a direction of the h-BN textured ceramic parallel to the slice layer. The orientation heat transfer hexagonal boron nitride / cordierite textured ceramic is prepared from the components in mass fraction: h-BN powder, MgO powder, nanometer Al2O3 powder and melted quartz powder. The preparation method comprises the steps of weighing the raw materials, mixing the raw materials, evaporating, drying and sieving; then loading into a graphite die, prepressing to obtain a blank body, and finally hot pressing and sintering. According to the orientation heat transfer hexagonal boron nitride / cordierite textured ceramic and the preparation method thereof provided by the invention, the hexagonal boron nitride / cordierite textured ceramic with a texture characteristic is prepared through a hot pressing and sintering technology, and theorientation degree of h-BN crystal particles is improved, so that the orientation heat transfer of the h-BN ceramic is realized, and the heat conductivity difference between the direction perpendicular to the slice layer and the direction parallel to the slice layer is 12.2 times. The orientation heat transfer hexagonal boron nitride / cordierite textured ceramic and the preparation method thereofprovided by the invention are applicable to preparing a textured ceramic heat protection material.

Description

technical field [0001] The invention relates to a textured ceramic and a preparation method thereof. Background technique [0002] Thermal protection material is a multi-functional material that protects the normal operation of communication, telemetry and other systems under high-temperature environmental conditions. It is widely used in aerospace, communication, energy, automobile and other fields. When the device is in use, in order to protect the internal parts from being damaged by high temperature, the outer layer material needs to have good heat resistance performance, that is, the thermal conductivity of the heat resistance material is required to be small in the direction of temperature transmission, but in the direction perpendicular to the temperature transmission. The thermal conductivity in the direction is greater. h-BN has excellent high temperature performance, such as low density (2.27g / cm 3 ), high temperature resistance, high chemical stability, excellen...

Claims

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Application Information

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IPC IPC(8): C04B35/5833C04B35/645
CPCC04B35/583C04B35/645C04B2235/3206C04B2235/3418C04B2235/3481C04B2235/9607
Inventor 杨治华牛波贾德昌蔡德龙孙扬善段文九李海亮段小明周玉
Owner HARBIN INST OF TECH
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