Boron nitride multiphase ceramic, and sintering method and application thereof

A technology of composite ceramics and boron nitride, which is applied in the application field of boron nitride composite ceramics and its sintering method, can solve the problems of high sintering temperature, coarse grains of composite ceramics, poor mechanical properties, etc., and reduce the sintering temperature , Inhibition of abnormal growth and reduction of production cost

Active Publication Date: 2018-02-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0024] Specific implementation mode 1: The transition phase-assisted low-temperature sintering method of boron nitride composite ceramics in this implementation mode is as follows:

[0025] 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;

[0026] 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;

[0027] 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

[0033] 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

[0034] 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

[0001] This application is a divisional application of the applicant Harbin Institute of Technology, the application number is 201510689599.9, the application date is October 21, 2015, and the invention name is "Transition-phase-assisted low-temperature sintering method for boron nitride composite ceramics". technical field [0002] The invention belongs to the field of boron nitride composite ceramic materials, and in particular relates to boron nitride composite ceramics and the application of a sintering method thereof. Background technique [0003] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/64
CPCC04B35/583C04B35/64C04B2235/3232C04B2235/3239C04B2235/3244C04B2235/3251C04B2235/3258C04B2235/3409C04B2235/3813C04B2235/3821C04B2235/3826C04B2235/3839C04B2235/3843C04B2235/3847C04B2235/6562C04B2235/6565C04B2235/661
Inventor 陈磊王玉金贾德昌周玉
Owner HARBIN INST OF TECH
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