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Preparation method for layered multiphase ceramic

A composite ceramic and layered technology, which is applied in the field of preparation of layered composite ceramics, can solve problems such as difficult large-scale production and long drying time, and achieve simplified production process, strong designability and low cost Effect

Inactive Publication Date: 2019-12-03
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This gel injection molding technology is a wet molding technology, and its green body usually takes a long time to dry, making it difficult to produce on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0026] (1) Mix silicon carbide powder, sintering aid, dispersant, binder, deionized water, defoamer, etc. evenly and ball mill for 24 hours to obtain ceramic slurry, and then spray granulate the ceramic slurry to obtain Silicon carbide ceramic granulated powder, the bulk density of the obtained granulated powder is 0.9-1.0g / cm 3 , The compacted density is 1.9~2.0g / cm 3 ;

[0027] (2), mix boron nitride and silicon carbide with the mixed powder, sintering aid, dispersant, binder, solvent, plasticizer, defoamer, etc. according to the mass ratio of 1:1, and ball mill for 24 hours, then The ball-milled slurry was vacuum defoamed in a vacuum defoaming machine for 60 minutes to prepare a boron nitride-silicon carbide interface ceramic slurry;

[0028] (3) Tape-cast the boron nitride / silicon carbide interface ceramic slurry to obtain an interface ceramic roll, and then cut the interface ceramic roll into a 100x100mm square boron nitride-silicon carbide layered interface layer cast ...

specific Embodiment 2

[0033](1) Mix boron carbide powder with sintering aids, dispersants, binders, deionized water, defoamers, etc., and ball mill for 24 hours to obtain ceramic slurry, and then spray granulate the ceramic slurry to obtain Silicon carbide ceramic granulated powder, the bulk density of the obtained granulated powder is 0.75-0.85g / cm 3 , The compacted density is 1.7~1.75g / cm 3 ;

[0034] (2), mix boron nitride and boron carbide according to the mass ratio of 1:1 mixed powder, sintering aid, dispersant, binder, solvent, plasticizer, defoamer, etc., and ball mill for 24 hours, then The ball-milled slurry was vacuum defoamed in a vacuum defoamer for 60 minutes to prepare a boron nitride-boron carbide interface ceramic slurry;

[0035] (3) Tape-cast the boron nitride-boron carbide interface ceramic slurry to obtain an interface ceramic roll, then cut the interface ceramic roll into a 100x100mm square boron nitride / boron carbide layered interface layer cast sheet, and cast The sheet t...

specific Embodiment 3

[0040] (1) Mix silicon carbide powder with sintering aid, dispersant, binder, deionized water, defoamer, etc. and ball mill for 24 hours to obtain ceramic slurry, and then spray granulate the ceramic slurry to obtain carbonization Silicon ceramic granulated powder, the bulk density of the obtained granulated powder is 0.9-1.0g / cm 3 , The compacted density is 1.9~2.0g / cm 3 ;

[0041] (2) Mix boron carbide mixed powder, sintering aids, dispersants, binders, solvents, plasticizers, defoamers, etc., and ball mill them for 24 hours, and then put the milled slurry in a vacuum defoamer Vacuum defoaming was carried out for 60 minutes to prepare a boron nitride-boron carbide interface ceramic slurry;

[0042] (3) The boron carbide interface ceramic slurry is tape cast to obtain an interface ceramic roll, and then the interface ceramic roll is cut into a boron carbide layered interface layer cast sheet of 100x100mm square, and the thickness of the cast sheet is 0.5mm;

[0043] (4) Ac...

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Abstract

The invention discloses a preparation method for a layered multiphase ceramic. The method includes the following preparation steps: firstly preparing an interfacial layer casting sheet and ceramic granulation powder, flatly spreading a layer of the ceramic granulation powder on the top surface of a pressure head of a mold, spreading a layer of the interfacial layer casting sheet on the basis, sequentially repeating the operation of reducing the height of the pressure head of the mold, flatly spreading a layer of the ceramic granulation powder and spreading a layer of the interfacial layer casting sheet on the ceramic granulation powder, reducing the height of the pressure head of the mold for the last time, flatly spreading the ceramic granulation powder, performing one-time pressure forming to obtain a layered multi-phase ceramic green body, finally performing degreasing, and performing sintering to obtain the required layered multi-phase ceramic product. The method provided by the invention uses a combination of the casting technology and the dry pressure forming technology, uses the casting technology to form the interface sheet to make the thickness of an interface layer accurate and controllable, and adopts the one-time pressure forming method to prepare the layered multi-phase ceramic, and the wavy structure of the interface layer makes a crack propagation path increased,and further improves the fracture toughness of the ceramic.

Description

technical field [0001] The invention relates to the technical field of ceramic preparation, in particular to a method for preparing layered multiphase ceramics by combining dry pressing molding technology and tape casting molding technology. Background technique [0002] Ceramic materials have high hardness, high strength, high wear resistance, low thermal expansion coefficient and excellent chemical stability, making them widely used in armor protection, petrochemical, iron and steel metallurgy, mechanical electronics, aerospace and other industrial fields. However, the brittleness of ceramic materials has become its fatal shortcoming, which makes it very easy to crack during the impact process, resulting in the failure of the material. Improving the toughness of ceramic materials is a hot spot in the research of ceramic materials, and layered structure ceramics are a new technology for ceramic reinforcement and toughening. It is composited by adding softer or tougher mate...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/563C04B35/565
CPCC04B35/563C04B35/565C04B35/622C04B2235/3821C04B2235/3826C04B2235/386C04B2235/602C04B2235/608
Inventor 邬国平熊礼俊于明亮谢方民戚明杰颜碧能
Owner NINGBO VULCAN TECH CO LTD
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