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A Cr-C-N ternary hard material and a preparing method thereof

A hard material, cr-c-n technology, applied in the field of ceramic hard materials, can solve the problems of inhomogeneous distribution of nitrogen, poor product purity, complex process, etc., and achieve the effects of easy control of conditions, favorable for industrialization promotion, and simple process

Active Publication Date: 2019-07-05
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cui Tian and others disclosed a high-temperature and high-pressure preparation method for chromium nitride in the patent CN106517111A. The method uses chromium trichloride, sodium chloride, etc. as raw materials, and is prepared under the extreme conditions of a pressure of 5GPa and a temperature of 1700-2000°C. Obtain the mixed massive product of chromium nitride and sodium chloride, and then further obtain chromium nitride after crushing, grinding, washing and drying; the method has complex process, poor product purity, harsh process conditions and high cost
Chen Kuisheng and others proposed in the patent CN102080163A to prepare chromium nitride alloys by direct nitriding, but this method has the problem of incomplete nitriding, which leads to uneven distribution of nitrogen in the alloy and affects the performance.

Method used

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  • A Cr-C-N ternary hard material and a preparing method thereof
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  • A Cr-C-N ternary hard material and a preparing method thereof

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preparation example Construction

[0030] The present invention provides the preparation method of Cr-C-N ternary hard material described in above scheme, comprises the following steps:

[0031] (1) chromium oxide and carbon source are mixed by ball milling and then dried to obtain a mixture;

[0032] (2) heat-treating the mixture under flowing nitrogen to obtain Cr-C-N ternary single-phase powder;

[0033] (3) Sintering the Cr-C-N ternary single-phase powder to obtain the Cr-C-N ternary hard material.

[0034] In the invention, the chromium oxide and the carbon source are mixed by ball milling and then dried to obtain the mixture. In the present invention, the carbon source is preferably one or more of carbon powder, graphite and carbon black, and the carbon black is preferably nano-carbon black; the present invention is to the source of the carbon powder, graphite and carbon black There is no special requirement, and a commercially available corresponding product can be used. In the present invention, when...

Embodiment 1

[0049] Weigh 80 grams of chromium oxide and 20 grams of carbon black and put them into a ball mill jar, ball mill and mix for 20 hours. The mixing medium is absolute ethanol. Take out the mixture and put it in an oven for drying. The temperature was raised to 1200°C for 1 hour, and the nitrogen flow rate was 2L / min. After cooling in the furnace, the Cr-C-N single-phase powder was obtained, which was taken out, crushed, sieved, and packaged. Then, weigh 20 grams of Cr-C-N ternary single-phase powder, put it into a mold, put it into a hot-press sintering furnace, and raise the temperature to 1200°C at a speed of 10°C / min under a pressure of 30MPa, and press-hold and sinter After 30 minutes, cool with the furnace to produce a Cr-C-N ternary hard material with a C content of 0.1% and an N content of 11%. The C content is measured by a carbon-sulfur analyzer, and the N content is measured by an oxygen-nitrogen analyzer. .

Embodiment 2

[0051] Weigh 87 grams of ammonium dichromate and 13 g of glucose, dissolve them in deionized water, stir until they are evenly mixed, concentrate and dry at 65°C for 4 hours to obtain a mixed precursor powder, then calcinate at 300°C for 2 hours under the protection of argon, and transfer to In the heat treatment furnace, the temperature was raised to 1100°C for 1 hour under flowing nitrogen, and the nitrogen flow rate was 1.5L / min. After cooling with the furnace, the Cr-C-N single-phase powder was obtained, taken out, crushed, sieved, and packaged. Then weigh 30 grams of Cr-C-N ternary single-phase powder, put it into a mold, put it into an SPS sintering furnace, and heat it up to 1300°C at a speed of 50°C / min under a pressure of 100MPa, and sinter under pressure for 10 minutes After cooling in the furnace, a Cr-C-N ternary hard material with a C content of 1.5% and a N content of 10% is prepared.

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Abstract

The invention relates to the technical field of ceramic hard materials and provides a Cr-C-N ternary hard material which is a single-phase solid solution material formed from Cr, C and N elements. Thehard material includes, by mass, 0.1-9% of C and 0.1-11% of N, with the balance being Cr. The hard material has excellent comprehensive properties including hardness, toughness, thermal stability, wear resistance, corrosion resistance, and the like, and has good stability during sintering and high-temperature service. In addition, the properties of the hard material can be selectively controlledthrough adjusting the C / N ratio. The invention also provides a preparing method of the hard material. The method is simple in process, conditions are easy to control and industrial promotion is facilitated.

Description

technical field [0001] The invention relates to the technical field of ceramic hard materials, in particular to a Cr-C-N ternary hard material and a preparation method thereof. Background technique [0002] Hard materials containing transition metal chromium mainly include chromium carbide and chromium nitride. Due to their high melting point, high hardness, excellent oxidation resistance and corrosion resistance, chromium carbide and chromium nitride are used in metallurgy, ceramic tools, and corrosion resistance. Widely used in grinding parts, protective coatings, targets and other fields. However, the stable phase region of chromium carbides and nitrides is extremely narrow, and their sintering stability is poor at high temperatures. For example, chromium carbides are very easy to form such as Cr 7 C 3 、Cr 23 C 6 A series of brittle η phases; the migration of N atoms in chromium nitrides causes the overflow of nitrogen, which induces the formation of chromium or chrom...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/626
CPCC04B35/58007C04B35/622C04B35/62605C04B2235/6562C04B2235/6567C04B2235/96
Inventor 马世卿仵金玲李建军王志杨治刚桑德利焦忆楠杨绍普
Owner SHIJIAZHUANG TIEDAO UNIV
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