High-performance boron carbide grinding medium as well as preparation method and application thereof

A grinding medium and boron carbide technology, applied in chemical instruments and methods, other chemical processes, grain processing, etc., can solve the problems of low grinding medium strength, poor grinding effect, and low grinding efficiency, so as to improve grinding efficiency and wear resistance Good performance and reduced production cost

Pending Publication Date: 2020-06-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at preparing B 4 C The grinding medium used in submicron ultrafine ceramic powder has low strength, fast loss or low grinding efficiency, poor grinding effect, and high cost. A low-cost, high-performance boron carbide grinding medium, preparation method and application are proposed.

Method used

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  • High-performance boron carbide grinding medium as well as preparation method and application thereof
  • High-performance boron carbide grinding medium as well as preparation method and application thereof
  • High-performance boron carbide grinding medium as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take B with a boron-carbon molar ratio of 3.9 and an average particle size of 0.5 μm 4 99.8g of raw material C and 0.2g of polyvinylidene fluoride were wet-milled in a ball mill tank for 5 hours, then taken out, and the mixed powder was dried in a vacuum oven at 80°C for 6 hours, and then passed through an 80-mesh sieve to make balls into B 4 C particles, the particles are placed in a quasi-elliptical mold with a major axis of 6mm and an aspect ratio of 2:1, and the pressure is maintained at 30MPa on a cold isostatic press for 10 minutes to form a green body, and the green body is subjected to multi-stage vacuum processing. For pressureless sintering, first raise the temperature to 500°C at a heating rate of 10°C, hold for 80 minutes, then raise the temperature to 1500°C at a heating rate of 3°C, hold for 120 minutes, then raise the temperature to 1800°C at 5°C, hold for 240 minutes, and then cool with the furnace to obtain The primary grinding medium is oval-shaped, an...

Embodiment 2

[0042] Take B with a boron-carbon molar ratio of 4.5 and an average particle size of 5 μm 4 87g of raw materials C, 10g of polyvinyl chloride, and 3g of polyurethane were wet-milled in a ball mill tank for 15 hours, then taken out, and the mixed powder was dried in a vacuum oven at 120°C for 4 hours, and then passed through a 150-mesh sieve to make balls into B 4 C particles, the particles are placed in a quasi-elliptical mold with a major axis of 24mm and a length-to-diameter ratio of 6:1, and the pressure is maintained at 120MPa on a cold isostatic press for 6 minutes to form a green body, and the green body is subjected to multi-stage under vacuum conditions. For pressureless sintering, first raise the temperature to 600°C at a heating rate of 20°C, hold for 20 minutes, then raise the temperature to 1700°C at a heating rate of 15°C, hold for 30 minutes, then raise the temperature to 2000°C at 8°C, hold for 60 minutes, and then cool with the furnace to obtain Oval-like prima...

Embodiment 3

[0044] Take B with a boron-carbon molar ratio of 4.0 and an average particle size of 2 μm 4 94g of raw material C, 4.5g of polyvinyl chloride, and 1.5g of dextrin were wet-milled in a ball mill tank for 10 hours, then taken out, and the mixed powder was dried in a vacuum oven at 220°C for 0.5 hours, and then passed through a 200-mesh sieve to make ball into B 4 C particles, the particles are placed in a quasi-elliptical mold with a major axis of 15mm and an aspect ratio of 3:1, and the pressure is maintained at 200MPa on a cold isostatic press for 4 minutes to form a green body, and the green body is subjected to multi-stage vacuum processing. For pressureless sintering, first raise the temperature to 560°C at a heating rate of 12°C, hold for 50 minutes, then raise the temperature to 1600°C at a heating rate of 8°C, hold for 80 minutes, then raise the temperature to 1900°C at 6°C, hold for 120 minutes, and then cool with the furnace to obtain Oval-like primary grinding medium...

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Abstract

The invention provides a high-performance boron carbide grinding medium as well as a preparation method and application thereof, and belongs to the technical field of material synthesis. The specificpreparation process comprises the following steps: uniformly mixing a boron carbide raw material, a carbon additive and a binding agent in a wet manner, drying, sieving, pelletizing into particles, putting the particles into a special mold, pressing into a blank, carrying out gradient heating under a vacuum condition, carrying out multi-stage pressureless sintering, and shaping to obtain the high-performance boron carbide grinding medium. The prepared grinding medium is specially suitable for producing boron carbide submicron ultrafine ceramic powder (D50 (0.8 mu m), has the characteristics ofhigh compactness, high hardness, wear resistance, high grinding efficiency and the like, and is simple in technological process, relatively low in preparation cost and easy for industrial large-scaleproduction.

Description

technical field [0001] The invention relates to the technical field of preparation of special ceramic materials, in particular to a preparation process of a high-performance boron carbide grinding medium. Background technique [0002] Boron carbide (B 4 C) It is an important special ceramic material with a Mohs hardness of 9.36, second only to diamond and cubic boron nitride; the theoretical density is only 2.52g / cm 3 , the neutron absorption cross section is as high as 347×10 -24 cm 2 , with a melting point of 2450°C; it has excellent characteristics such as high hardness, low density, excellent thermal neutron absorption performance, high melting point, stable chemical properties and high temperature resistance, so it is widely used as high-end military bulletproof armor materials, nuclear industry shielding and control materials , advanced abrasive materials, engineering ceramic materials, and advanced refractory materials, among which high-end military bulletproof arm...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/64C09K3/14B02C23/00C04B35/626
CPCB02C23/00C04B35/563C04B35/622C04B35/6261C04B35/64C04B2235/425C04B2235/48C04B2235/483C04B2235/5248C04B2235/5288C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/668C04B2235/96C09K3/1409
Inventor 李欣杨建红乔佳
Owner JIANGSU UNIV
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