Cr-C-N-based metal ceramic and preparation method thereof

A metal-based, cr-c-n technology, applied in the field of cermet materials, can solve the problems of difficult process, poor bending strength and hardness, etc., and achieve the effect of easy control of conditions, simple process and favorable industrialization promotion

Active Publication Date: 2019-07-12
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liu Xuequan reported a chromium carbide-based hard alloy with composite fiber structure characteristics in the patent CN102560293A. However, the properties of the materials prepared by this method have obvious anisotropy, and the process is difficult to achieve, and the bending strength and hardness are relatively high. Difference

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  • Cr-C-N-based metal ceramic and preparation method thereof

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preparation example Construction

[0052] The present invention provides a method for preparing the Cr-C-N-based cermet described in the above technical solution, comprising the following steps:

[0053] (1) The Cr-C-N hard phase powder, metal powder and carbide powder are mixed by ball milling and then dried to obtain a mixture;

[0054] (II) After mixing the mixture with a molding agent, granulating and pressing are performed sequentially to obtain a molding material;

[0055] (III) Sintering the molding material to obtain the Cr-C-N-based cermet.

[0056] In the invention, the Cr-C-N hard phase powder, metal powder and carbide powder are mixed by ball milling and then dried to obtain a mixture. In the present invention, the ball-to-material ratio of ball milling in the step (I) is preferably 4:1 to 8:1, more preferably 6:1; the time for ball milling is preferably 40 to 80 hours, more preferably 60h; the mixing medium of the ball mill is one or more of absolute ethanol, absolute methanol and acetone. The p...

Embodiment 1

[0062] (1) Powder making: Weigh 80 grams of chromium oxide and 20 grams of carbon black and put them into a ball mill jar, and ball mill and mix them for 20 hours. The mixing medium is absolute ethanol. Take out the mixture and put it in an oven for drying. In the furnace, the temperature was raised to 1200°C for 1 hour under flowing nitrogen, and the nitrogen flow rate was 2L / min. After cooling with the furnace, a Cr-C-N single-phase powder with a C content of 0.1% and a N content of 11% was obtained, which was taken out, crushed, Sieve and package.

[0063](2) Ball mill mixing: Weigh 60 grams of Cr-C-N single-phase powder prepared in step (1), 20 grams of Cr-Ni alloy powder, and 20 grams of TiC powder, and put them into a ball mill tank with a ball-to-material ratio of 4: 1. The ball milling medium is absolute ethanol, and the ball milling is mixed for 60 hours, and the mixture is taken out and put into an oven for drying.

[0064] (3) Granulating and pressing: In the mixtu...

Embodiment 2

[0067] (1) Powder making: Weigh 86 grams of ammonium chromate and 14 g of glucose, dissolve them in deionized water, stir until they are evenly mixed, concentrate and dry at 85°C for 2 hours to prepare mixed precursor powder, and then store them at 400°C under the protection of argon Calcined for 4 hours, transferred to a heat treatment furnace, heated to 1300°C under flowing nitrogen for heat treatment for 0.5 hours, and the nitrogen flow rate was 3L / min. After cooling with the furnace, Cr-C-N with a C content of 2.1% and an N content of 9.2% was obtained. Single-phase powder, taking out, crushing, sieving, packaging.

[0068] (2) Ball mill mixing: Weigh 60 grams of Cr-C-N single-phase powder prepared in step (1), 10 grams of Ni powder, and 30 grams of WC powder, put them into a ball mill tank, the ratio of ball to material is 8:1, and ball mill The medium is acetone, ball milled and mixed for 40 hours, and the mixed material is taken out and put into an oven for drying.

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Abstract

The invention provides a Cr-C-N-based metal ceramic, and relates to the technical field of metal ceramic materials. The Cr-C-N-based metal ceramic is prepared by the following components in mass percentage content: 10-40% of metal powder, 5-30% of carbide powder, and the balance Cr-C-N hard-phase powder, the Cr-C-N hard-phase powder is the single-phase solid solution formed by three elements of Cr, C and N in mass percentage: 0.1-9% of C, 0.1-11% of N and the balance of Cr.. The Cr-C-N-based metal ceramic has the comprehensive properties such as the excellent hardness, toughness, thermal stability, wear resistance and corrosion resistance, and the sintering stability is high. The invention further provides a preparation method for the metal ceramic, and the preparation method is simple inprocess, the condition is controllable, and the popularization of the industrialization is benefited.

Description

technical field [0001] The invention relates to the technical field of cermet materials, in particular to a Cr-C-N-based cermet and a preparation method thereof. Background technique [0002] Chromium carbide (Cr 3 C 2 ) has properties such as high melting point, high hardness, excellent oxidation resistance and corrosion resistance, so the chromium carbide-based cermet made by mixing it with metal Ni, Cr, etc. has excellent wear resistance and corrosion resistance, and is used in metallurgy , ceramic cutting tools, wear-resistant parts, protective coatings, targets and other fields are widely used. However, the stable phase region of chromium carbide is extremely narrow, and the wettability and stability of sintering at high temperature are poor, and it is easy to form such as Cr 7 C 3 、Cr 23 C 6 A series of brittle η phases, in addition, a large number of holes and other defects will be formed inside the structure, which seriously damages the mechanical properties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/04
Inventor 马世卿仵金玲桑德利焦忆楠李建军杨治刚王志杨绍普
Owner SHIJIAZHUANG TIEDAO UNIV
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