Transition phase assisted low-temperature sintering method of boron nitride multi-phase ceramic

A technology of multiphase ceramics and low temperature sintering, which is applied in the sintering field of boron nitride multiphase ceramics, can solve the problems of high sintering temperature, coarse grains of multiphase ceramics, poor mechanical properties, etc. The effect of large and low production cost

Active Publication Date: 2015-12-30
HARBIN INST OF TECH
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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 discloses a transition phase assisted low-temperature sintering method of boron nitride multi-phase ceramic and relates to a sintering method of boron nitride multi-phase ceramic. The invention aims at solving the problems that the crystal grains of the prepared multi-phase ceramic are coarse and the mechanical performance is poor for a reason that the sintering temperature of the existing boron nitride multi-phase ceramic. The method comprises the following steps: 1) preparing composite sintering assistant powder; 2) preparing composite powder; 3) increasing the temperature of the composite powder under a vacuum or inert atmosphere condition, increasing pressure and then decreasing the temperature to obtain the boron nitride multi-phase ceramic. The compactness of the boron nitride multi-phase ceramic prepared by adopting the method disclosed by the invention can reach more than 95 percent, the crystal grains of the material are fine and the comprehensive mechanical performance is excellent. The invention belongs to the field of preparation of boron nitride multi-phase ceramics.

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 Applications(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
Inventor 王玉金陈磊张馨予贾德昌周玉
Owner HARBIN INST OF TECH
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