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Boron carbide/silicon carbide ceramic entire board and preparation method and application thereof

A silicon carbide ceramic and boron carbide technology, which is applied to the whole boron carbide/silicon carbide ceramic plate and its preparation field, can solve the problems of poor comfort of the bulletproof plate, affecting the ballistic resistance of the bulletproof plate, etc., so as to achieve improved ballistic resistance and good comfort. Effect

Inactive Publication Date: 2016-05-04
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there are inevitably gaps between the silicon carbide blocks and between the silicon carbide blocks and the back plate, which seriously affect the bulletproof performance of the bulletproof board; at the same time, because the small silicon carbide blocks are flat, only a gentle approximate curved surface can be spliced. The bulletproof plate is less comfortable to use

Method used

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  • Boron carbide/silicon carbide ceramic entire board and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1. Preparation of multi-curved boron carbide / silicon carbide ceramic whole board

[0053] Prepare a multi-curved boron carbide / silicon carbide ceramic whole plate as follows:

[0054] (1) Boron carbide powder 90g (D 50 : 0.7μm), silicon carbide powder 1500g (D 50 : 0.5 μm), coke 20g (particle size is 5 μm), deionized water 1500g are added in the ball mill, add 10g dispersant (tetramethylammonium hydroxide) and 8g binding agent (dextrin) and carry out ball mill pulping, get slurry Material (solid content is 48%); Ball milling condition is as follows: adopt boron carbide ceramic ball as the medium ball during ball milling, and ball diameter is 10mm, and the ratio of ball material ratio namely the weight of medium ball and powder material total weight is 1.5:1, The mixing time of the ball mill was 40 hours, the pH value of the slurry was 10.1, and the rotational speed of the ball mill was 150 rpm.

[0055] (2) The slurry obtained in step (1) is subjected to spra...

Embodiment 2

[0059] Example 2, preparation of multi-curved boron carbide / silicon carbide ceramic whole board

[0060] Prepare a multi-curved boron carbide / silicon carbide ceramic whole plate as follows:

[0061] (1) Boron carbide powder 80g (D 50 : 0.5μm), silicon carbide powder 1300g (D50: 0.4μm), graphite powder 80g (particle size 5μm), deionized water 1300g into the ball mill, add 8g dispersant (PVB) and 6g binder (PVA) Ball milling (the conditions and process of ball milling pulping are as in Example 1) to obtain slurry (solid content is 47%, pH value is 10.3).

[0062] (2) The slurry obtained in step (1) is subjected to spray granulation to obtain granulated material, specifically: after the slurry is passed through a 300-mesh sieve, the slurry is sent to the centrifugal turntable of the centrifugal drying granulator with a constant flow pump , the rotational speed of the centrifugal turntable is 5000 revolutions per minute to form tiny mist droplets, the inlet temperature of the dr...

Embodiment 3

[0066] Example 3, preparation of multi-curved boron carbide / silicon carbide ceramic whole board

[0067] Prepare a multi-curved boron carbide / silicon carbide ceramic whole plate as follows:

[0068] (1) Boron carbide powder 40g (D 50 : 0.5μm), silicon carbide powder 1350g (D50: 0.5μm), carbon black 50g (particle size 2μm), deionized water 1500g into the ball mill, add 10g dispersant (tetramethylammonium hydroxide) and 8g adhesive agent (dextrin) for ball milling (ball milling conditions and process are as in Example 1) to obtain slurry (solid content is 50%, pH value is 10.0).

[0069] (2) the slurry obtained in step (1) is passed through the granulated powder of spray granulation, specifically: after the slurry is passed through a 300-mesh sieve, the slurry is sent to the nozzle of the spray drying granulator with a constant flow pump, The pressure is 0.3 MPa to form tiny mist droplets, the inlet temperature of the dryer is 230° C., and the outlet temperature is 120° C. to ...

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Abstract

The invention discloses a boron carbide / silicon carbide ceramic entire board and a preparation method and application thereof. The method comprises the following steps: (1) mixing boron carbide powder, silicon carbide powder, carbon powder, a binder, a dispersant and water, and then, carrying out ball-milling and slurrying, so as to prepare slurry; (2) enabling the slurry prepared in the step (1) to be subjected to drying and granulating by adopting spray granulation and drying processes, so as to obtain granules; (3) carrying out compacting molding on the granules prepared in the step (2) by adopting a cold isostatic compacting process, so as to obtain a biscuit; (4) carrying out pressure-less sintering on the biscuit prepared in the step (3), and carrying out cooling, thereby obtaining the ceramic entire board. According to the boron carbide / silicon carbide ceramic entire board and the preparation method and application thereof, the boron carbide / silicon carbide biscuit, of which the density of all points are uniform, is obtained by adopting a cold isostatic compacting method and determining the pressure holding pressure and pressure holding time of each stage through repeated trials, and the biscuit is uniformly contracted proportionally during sintering, so that the original camber of the biscuit is completely reserved, and a pressure-less sintering process can be applied to the preparation of large-area and complicated-shape boron carbide / silicon carbide workpieces.

Description

technical field [0001] The invention relates to a boron carbide / silicon carbide ceramic whole board, a preparation method and application thereof. Background technique [0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. It has become an irreplaceable structural ceramic with excellent performance in many industrial fields. Silicon carbide ceramics have high performance and are widely used in the industrial field, but silicon carbide is a covalently bonded compound with strong covalent properties. The sintering of silicon carbide has always been a research hotspot in the material industry. How to adopt a simpler production process The preparation of high-density silicon carbide ceramic products has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/64
CPCC04B35/565C04B35/62695C04B35/64C04B2235/3821C04B2235/422C04B2235/424C04B2235/425C04B2235/604C04B2235/77C04B2235/96
Inventor 马天张福军季月李伟萍
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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