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Preparation method of boron carbide ceramic

A technology of boron carbide ceramics and boron nitride powder, which is applied in the field of preparation of boron carbide ceramics, can solve the problems of high production costs, high requirements for product purity, and unsuitability for large-scale industrialization.

Inactive Publication Date: 2013-05-22
常熟佳合高级陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment used in this patent and the requirements for product purity are relatively high, and the production cost is relatively expensive, so it is not suitable for large-scale industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 1455g of boron carbide powder (D50=1.9μm), 45g of B powder, 37.5g of isobutylene polymer, 100g of absolute alcohol, 1500g of deionized water, 15g of tetramethylammonium hydroxide into the ball mill jar, and add 2000g of B4C Medium balls, milled for 36 hours to obtain a slurry with a viscosity not greater than 5dpa.s. The slurry is sent to the centrifugal turntable of the spray drying granulator through the peristaltic pump, the rotation speed of the centrifugal turntable is 3840rpm, the temperature of the air inlet is 230oC, and the temperature of the air outlet is 140oC. After cooling, collect the granulated material and pass through an 80-mesh sieve.

[0018] Fill the granulated material into a metal mold, press 30MPa to form a sample of 60mm×60mm×6mm, put it in a graphite mold, vacuum hot press, pressure 35MPa, the heat system is 1300 oC for 1 hour, and 1 hour to heat up to 2060oC, keep warm for 0.5 hours, then cool down to room temperature with the furnace.

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Embodiment 2

[0022] Put 1455g of boron carbide powder (D50=1.9μm), 97.5g of BN powder, 37.5g of isobutylene polymer, 100g of absolute alcohol, 1500g of deionized water, 15g of tetramethylammonium hydroxide into the ball mill jar, and add 2000g B4C medium balls, milled for 36 hours, to obtain a slurry with a viscosity not greater than 5dpa.s. The slurry is sent to the centrifugal turntable of the spray drying granulator through the peristaltic pump, the rotation speed of the centrifugal turntable is 3840rpm, the temperature of the air inlet is 230oC, and the temperature of the air outlet is 140oC. After cooling, collect the granulated material and pass through an 80-mesh sieve.

[0023] Fill the granulated material into a metal mold, press 30MPa to form a sample of 60mm×60mm×6mm, place it in a graphite mold, vacuum hot press, the pressure is 20MPa, the heat system is 1300 oC for 1 hour, and the temperature is raised to 1 hour. 2000oC, keep warm for 0.5 hours, then cool down to room tempera...

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Abstract

The invention discloses a preparation method of boron carbide ceramic which has a high boron content or is rich in boron. The preparation method comprises the following steps: 1, mixing boron carbide ceramic powder, a binding agent, a dispersing agent, plasticizer, lubricant and deionized water according to a common process, stirring at a high speed, performing ball milling or ultrasonic dispersion to prepare uniform pulp, then introducing into a centrifugal spray tower through a peristaltic pump, and performing spray granulation; 2, screening with a screen, and molding the granulation powder obtained in the step 1 in a one-way pressurization manner or isostatic pressurization manner; and 3, performing sinter molding on the biscuit obtained in the step 2. The preparation method is characterized in that boron powder or boron nitride powder is added in the step 1 in such a manner that the boron source (the boron powder or boron nitride powder) is introduced in the mixing process and is mutually and uniformly dispersed, so that the boron carbide biscuit having uniform boron powder or boron nitride powder distribution can be formed through molding, thereby increasing the boron content in the final sintered body and further improving the mechanical properties of the boron carbide ceramic.

Description

technical field [0001] The invention belongs to the field of preparation of boron carbide ceramics, in particular to a method for preparing boron carbide ceramics with relatively high boron content. Background technique [0002] Boron carbide has a series of excellent properties, such as low density, the theoretical density is only 2.52g / cm 3 , high hardness, Mohs hardness is 9.3, microhardness is 55~67 GPa, it is the hardest material after diamond and cubic BN, chemical properties are stable, boron carbide does not mix with acid, alkali and most inorganic materials at room temperature Compound reaction, only slow corrosion in hydrofluoric acid-sulfuric acid, hydrofluoric acid-nitric acid mixture, is one of the most stable chemical compounds. At the same time, boron carbide also has a strong ability to absorb neutrons. Based on these excellent properties, boron carbide has been widely used in many fields such as wear-resistant and corrosion-resistant devices, bulletproof a...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622
Inventor 张福军
Owner 常熟佳合高级陶瓷材料有限公司