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Transition Phase Assisted Low Temperature Sintering Method of Boron Nitride Composite Ceramics

Through the transition phase-assisted low-temperature sintering method, the problems of high sintering temperature and poor mechanical properties of boron nitride multi-phase ceramics are solved, the preparation of fine grains and high performance is achieved, the cost is reduced, and the scope of application is expanded.

Active Publication Date: 2018-06-26
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 aims to solve the problems of high sintering temperature of existing boron nitride composite ceramics, coarse grains and poor mechanical properties of the prepared composite ceramics, and provides a transition phase-assisted low-temperature sintering method of boron nitride composite ceramics

Method used

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specific Embodiment approach 1

[0023] Specific implementation mode 1: The transition phase-assisted low-temperature sintering method of boron nitride composite ceramics in this implementation mode is as follows:

[0024] 1. Add the composite sintering aid into the alcohol dispersion medium, ball mill for 10-48 hours, then dry at 80°C-150°C for 10-48 hours, then pass the dried mixed powder through a 200-mesh standard sieve to obtain the composite sintering aid powder;

[0025] 2. Add the composite sintering aid powder and boron nitride powder into the alcohol dispersion medium according to the volume ratio of (5~35):(65~95), and after ball milling for 10~48 hours, at 80℃~150℃ Drying for 10 to 48 hours, passing through a 200-mesh standard sieve to obtain evenly mixed boron nitride composite powder;

[0026] 3. Heat up the boron nitride composite powder at a heating rate of 10-20°C / min under vacuum or an inert atmosphere, start pressurizing at 800°C-1000°C, and pressurize to 20MPa~ at 1000°C-1400°C 60MPa, ke...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment differs from Embodiment 1 in that the dispersion medium in step 1 can also be an aqueous solution of absolute ethanol or absolute ethanol with a mass fraction of 55% to 95% of absolute ethanol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the titanium dioxide can be zirconium dioxide, hafnium dioxide or tantalum dioxide. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a boron nitride multiphase ceramic, and a sintering method and application thereof. The sintering method comprises the following steps: 1, preparing the powder of a compositesintering aid; 2, preparing composite powder; and 3, subjecting the composite powder to heating, pressurizing and cooling successively under vacuum or in an inert atmosphere to obtain the boron nitride multiphase ceramic. The invention also relates to application of the boron nitride multiphase ceramic prepared by using the method as a side sealing board material. The boron nitride multiphase ceramic prepared by using the method has a density of more than 95%, a small grain size and excellent comprehensive mechanical properties.

Description

technical field [0001] The invention relates to a sintering method of boron nitride composite phase ceramics. Background technique [0002] With the rapid development of the world economy and science and technology, the demand for metal materials in aerospace, transportation, water conservancy, and urban construction is increasing. In particular, the smelting and processing of special metal materials has become the main field for the development of various countries. Every country will use its Included in the key development areas of the national economy and people's livelihood. The special metal smelting technology puts forward strict requirements on refractory materials, which require strong corrosion resistance, no secondary pollution, excellent high-temperature mechanical properties and high-temperature service stability. As a result, traditional high-alumina bricks, high-magnesia bricks and other refractory systems can no longer meet the needs of special working condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/583C04B35/645
CPCC04B35/583C04B35/64C04B2235/3232C04B2235/3239C04B2235/3244C04B2235/3251C04B2235/3258C04B2235/3409C04B2235/3813C04B2235/3821C04B2235/3826C04B2235/3839C04B2235/3843C04B2235/3847C04B2235/6562C04B2235/6565C04B2235/661
Owner HARBIN INST OF TECH
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