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Preparation method of chromic boride powder

A technology of chromium boride and powder, which is applied in the field of preparation of chromium boride powder, can solve the problems of non-single phase, high cost, and application limitation, and achieve the effects of uniform particle size distribution, convenient operation, and short process route

Inactive Publication Date: 2018-05-04
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Li Fumin and others from the School of Metallurgy and Energy of Hebei University of Technology published an academic paper entitled "Phase Structure Analysis of Chromium Plating and Boronizing Layer on the Surface of 45 Steel" in "Journal of Materials Heat Treatment", Volume 27, Issue 1, 2006. In the paper The author prepared the chromium-plated layer containing both CrB and CrB by boronizing the chrome-plated layer on the surface of 45 steel in the slag. 2 Chromium boride coating with two phases. The disadvantage of this method is firstly that the hard chrome plating process, which has a serious impact on environmental pollution, is used to electroplate the surface of the workpiece. Secondly, the prepared chromium boride coating is very thin and the phase Not single, the cost is relatively high
Zhang Shucan from North University of China used high-power pulsed magnetron sputtering deposition technology and DC magnetron sputtering respectively in his 2016 master thesis "Preparation of Chromium Diboride Coating and Research on its Structure and Properties". CrB 2 coating, but the study found two methods of preparing CrB 2 The coatings all contain a small amount of Cr, and this method is costly and its application is greatly limited, that is, CrB 2 Must be applied as a coating
Gao Song from Nanjing University of Aeronautics and Astronautics in his 2016 master thesis "Study on the structure, mechanical properties and friction characteristics of chromium boride-based thin films in water environment", through the unbalanced magnetron sputtering system and the DC RF co-sputtering system in the CrB was prepared on substrate 316L stainless steel sheet and Si sheet 2 Thin film, this method also has the problems of high cost and limited application

Method used

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  • Preparation method of chromic boride powder
  • Preparation method of chromic boride powder
  • Preparation method of chromic boride powder

Examples

Experimental program
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Effect test

Embodiment 1

[0026] a. Put the B powder with a mass percent purity of 95.0% in a graphite crucible whose inner wall is coated with BN powder, and then place it in a hydrogen reduction furnace together, purify and remove impurities at 1250 ° C, and the reduction time is 2.5 hours. High-purity B powder with a purity of 99.8%;

[0027] b. Place the Cr powder with a mass percent purity of 99.5% in a graphite crucible coated with BN powder on the inner wall in a hydrogen reduction furnace, and perform reduction and deoxygenation at 750° C. for 2 hours to obtain reduced Cr powder;

[0028] c, the B powder and Cr powder that step a and step b make are joined in the ball mill tank in the ratio of 2: 1 in molar ratio, add the ethanol that water content mass fraction is 0.5%, ball mill 48 hours, used ball mill tank and The balls are made of polytetrafluoroethylene;

[0029] d. The ball-milled material is dried in a vacuum drying oven at 90°C for 32 hours;

[0030] e. Transfer the dried material to...

Embodiment 2

[0035] a. Put the B powder with a percentage purity of 95.0% in a graphite crucible coated with BN powder on the inner wall, and then place it in a hydrogen reduction furnace together, purify and remove impurities at 1280 ° C, and the reduction time is 2 hours to obtain the purity 99.88% high-purity B powder;

[0036] b. Place Cr powder with a mass percent purity of 99.6% in a graphite crucible coated with BN powder on the inner wall in a hydrogen reduction furnace, and perform reduction and deoxygenation at 850°C for 2 hours to obtain reduced Cr powder ;

[0037] c. Add the B powder and Cr powder prepared in step a and step b into a ball milling tank with a molar ratio of 1:1, add ethanol with a water content of 0.01%, and ball mill for 36 hours. The ball milling tank and balls All made of polytetrafluoroethylene;

[0038] d. Pour the ball-milled mixture into a stainless steel tray, and then place it in a vacuum drying oven for drying. The drying temperature is 85°C and the...

Embodiment 3

[0043] (1) First place the B powder and the Cr powder in a graphite crucible coated with BN powder on the inner wall, and use a hydrogen reduction furnace to perform high-temperature reduction and removal of impurities. The reduction temperature of the boron powder is 1280 ° C, and the reduction time is 2.5 hours; The reduction temperature of the powder is 850°C, and the reduction time is 2.0 hours;

[0044] (2) The B powder and Cr powder after reduction and removal of impurities are added to the ball mill mixing tank according to the molar ratio of 1.5:1, and the ball mill is mixed for 36 hours. The ball mill medium is edible alcohol, and both the ball mill tank and the ball mill ball The material of polytetrafluoroethylene;

[0045] (3) Pour the ball-milled mixture into a stainless steel tray, then place it in a vacuum drying oven for drying, the drying temperature is 85°C, and the drying time is 36 hours;

[0046] (4) Transfer the dried material to a graphite crucible whos...

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Abstract

The invention discloses a preparation method of chromic boride powder. The preparation method comprises the following steps: a, placing B (boron) powder into a graphite crucible with an inner wall coated with BN powder, then placing into a hydrogen reducing furnace, and performing the reduction; b, reducing Cr powder into the graphite crucible with the inner wall coated with the BN powder; c, ballmilling the B powder and the Cr powder prepared in step a and step b according to a molar ratio of 1:1 or 2:1; d, drying the ball milled material; e, heating to 800 to 2400 DEG C at a heating rate of0.5 to 30 DEG C per min under the pressure of 10 to 30 GPa, and sintering for 0.5 to 8 hours; f, crushing chromic boride blocks, and filtering by virtue of a 40-mesh to 60-mesh sieve; and g, ball milling and screening the prepared chromic boride particles. By adopting the method of the invention, the high-quality chromic boride powder with complete crystals and single phase can be prepared.

Description

technical field [0001] The invention relates to a preparation method of chromium boride powder. Background technique [0002] With the rapid advancement of science and technology and the continuous improvement of industrial technology, modern manufacturing has higher and higher requirements for the comprehensive performance of materials. Chromium boride has the characteristics of high melting point, high hardness, wear resistance, high temperature resistance, etc., coupled with its good chemical inertness and the characteristics of not easy to bond with metals, it is widely used in alloy materials, coating materials, high temperature Structural materials, corrosion-resistant materials, wear-resistant materials, neutron absorbing materials, cutting materials and other fields have shown excellent application value and huge market prospects. Common chromium boride compounds mainly include CrB and CrB 2 Two, the traditional synthesis method is to react excess boric acid with c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
CPCC01B35/04C01P2002/72C01P2004/03C01P2006/80
Inventor 刘宝刚李鸿娟纪忠璇黄珊
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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