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Method for preparing lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics

A boron nitride-based, directional thermal conductivity technology, applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as low thermal conductivity, and achieve high efficiency, simple process, strong promotion and application value. Effect

Active Publication Date: 2016-04-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing methods cannot prepare hexagonal boron nitride ceramics with good thermal conductivity in a certain direction, but require relatively low thermal conductivity in other directions, and provide a kind of hexagonal boron nitride ceramics with Preparation method of layered hexagonal boron nitride-based composite ceramics with directional thermal conductivity

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0031] Specific Embodiment 1: This embodiment is a method for preparing layered hexagonal boron nitride-based composite ceramics with directional thermal conductivity, which is specifically prepared according to the following method:

[0032] one,

[0033] ①. Press the hexagonal boron nitride powder under a pressure of 20MPa-100MPa to obtain a hexagonal boron nitride blank with a thickness of 0.1mm-1mm;

[0034] ②. Mix the oxide ceramic powder and the binder evenly, and then press it under a pressure of 20MPa-100MPa to obtain an oxide ceramic blank with a thickness of 0.1mm-1mm;

[0035] The mass ratio of the binder and the oxide ceramic powder described in step 1.2 is (1~5):100;

[0036] 2. Lay the hexagonal boron nitride blank with a thickness of 0.1mm to 1mm and the oxide ceramic blank with a thickness of 0.1mm to 1mm, and then press it under a pressure of 1MPa to 20MPa, and then laminate to obtain a laminate Body A;

[0037] The thickness of the laminated body A describ...

specific Embodiment approach 2

[0057] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the hexagonal boron nitride powder described in step ① is 0.3 μm to 15 μm, and the purity is >98%. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0058]Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the oxide ceramic powder described in Step 1.2 is fused silica, mullite alumina, zirconia, calcium oxide, oxide One or a mixture of aluminum and magnesium oxide. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics, which relates to a method for preparing composite ceramics, and aims to solve the problems that existing methods can not prepare hexagonal boron nitride ceramics which have excellent thermal conductive characteristics in a certain direction and need relatively low thermal conductive rate in another directions. The method for preparing the lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics comprises steps: 1 preparing hexagonal boron nitride blanks and oxide ceramic blanks; 2 preparing laminated green bodies A; 3 preparing laminated green bodies B; 4 preparing laminated green bodies of removal binders; and 5 sintering to obtain the lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics. The lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics which are prepared through the method for preparing the lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics are 15W / (m.k)-20W / (m.k) in thermal conductivity, and is 2W / (m.k)-3.5W / (m.k) in thermal conductivity which is vertical to lamellars. The method for preparing the lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics can prepare the lamellar hexagonal boron nitride composite ceramics with directional thermal conductive characteristics.

Description

technical field [0001] The invention relates to a preparation method of composite ceramics. Background technique [0002] Hexagonal boron nitride ceramics have good heat resistance, high thermal conductivity and machinability, and can be used as heat conduction materials under high temperature conditions. However, in some usage environments, materials are required to have good thermal conductivity in only one direction, and relatively low thermal conductivity in other directions, so that heat can spread along a specific direction, which can better protect related parts. [0003] The prior art cannot prepare hexagonal boron nitride ceramics that have good thermal conductivity in a certain direction but require relatively low thermal conductivity in other directions. Contents of the invention [0004] The purpose of the present invention is to solve the problem that existing methods cannot prepare hexagonal boron nitride ceramics with good thermal conductivity in a certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5833C04B35/64C04B35/645B32B37/12B32B37/10B32B37/06
CPCB32B37/06B32B37/10B32B37/12C04B35/583C04B35/645C04B35/6455C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/658C04B2235/666
Inventor 段小明贾德昌杨治华田卓何培刚王胜金周玉
Owner HARBIN INST OF TECH