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A three-dimensional fiber skeleton toughened cermet and its preparation method

A fiber skeleton and cermet technology, which is applied in the field of cermet materials, can solve the problems of high brittle fracture failure of cermets, achieve good damage tolerance performance, high-efficiency fiber toughening, and improve toughness

Active Publication Date: 2021-10-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] An object of the present invention is to provide a three-dimensional fiber-skeleton toughened cermet, which solves the problems of high brittleness and failure without warning fracture in existing cermets

Method used

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  • A three-dimensional fiber skeleton toughened cermet and its preparation method
  • A three-dimensional fiber skeleton toughened cermet and its preparation method
  • A three-dimensional fiber skeleton toughened cermet and its preparation method

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preparation example Construction

[0034] A preparation method of a three-dimensional fiber skeleton toughened cermet of the present invention comprises the following steps:

[0035] Step 1, weigh the following components according to the mass percentage, WC, WN, Cr with a particle size of 5-20 μm 2 C 3, CrN, TiC, TiN, SiC, SiN powder or one or more of them, or multi-component solid solution composed of W, Cr, Ti, Si, C and N 70%-85%, Nb powder with a particle size of 5μm-10μm Or 5-15% of Ta powder, 5-15% of cast iron powder (HT300) with a particle size of 1μm-5μm; the sum of the volume percentages of the above components is 100%;

[0036] Step 2: using a ball mill to mix the powder weighed in step 1 evenly to form a mixed powder;

[0037] Step 3: adding a small amount of plasticizer to the mixed powder, and then putting it into a mixer for plasticizing treatment and granulation to form a mixed material; wherein, the mass percentage of the plasticizer in the mixed powder is 0.6-0.9 wt%.

[0038] Step 4: Pref...

Embodiment 1

[0042] A preparation method of a three-dimensional fiber skeleton toughened cermet of the present invention comprises the following steps:

[0043] Step 1: Weigh 70% of WC powder with an average particle size of 20 μm, 15% of Nb powder with an average particle size of 10 μm, and 15% of cast iron powder (HT300) with a particle size of 5 μm according to mass percentage, and the sum of the volume percentages of the above components 100%; the purity of the above powders is greater than 99.5%;

[0044] Step 2: using a ball mill to mix the powder weighed in step 1 evenly to form a mixed powder;

[0045] Step 3: Add a small amount of plasticizer to the mixed powder, and then put it into a mixer for plasticization and granulation to form a mixed material; wherein, the plasticizer is paraffin oil, and the plasticizer accounts for the mass percentage of the mixed powder 0.8wt%;

[0046] Step 4: Use Nb fibers with a wire diameter of 600 μm to prefabricate the skeleton structure to form...

Embodiment 2

[0053] A preparation method of a three-dimensional fiber skeleton toughened cermet of the present invention comprises the following steps:

[0054] Step 1, weigh WC powder 70% and Cr with an average particle size of 5 μm according to mass percentage 2 C 3 15% powder, 5% Nb powder with an average particle size of 5 μm, 10% cast iron powder (HT300) with a particle size of 5 μm, the sum of the volume percentages of the above components is 100%; the purity of the above powders is greater than 99%;

[0055] Step 2: using a ball mill to mix the powder weighed in step 1 evenly to form a mixed powder;

[0056] Step 3: Add a small amount of plasticizer to the mixed powder, and then put it into a mixer for plasticization and granulation to form a mixed material; wherein, the plasticizer is paraffin oil, and the plasticizer accounts for the mass percentage of the mixed powder 0.7wt%;

[0057] Step 4: using metal Nb fibers with a wire diameter of 500 μm to prefabricate the skeleton str...

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Abstract

The invention discloses a three-dimensional fiber-skeleton toughened cermet, which comprises the following components according to the volume percentage: 2%-9% of skeletonized metal fibers, 60%-80% of micron carbon and nitride grains, submicron 8% to 24% of high-grade carbide grains and 6% to 10% of Fe binder phase, the sum of the volume percentages of the above components is 100%, the metal fibers are Ta fibers or Nb fibers, micron-sized carbon, nitride crystals Particles are micron WC, WN, Cr 2 C 3 , CrN, TiC, TiN, SiC, SiN grains or one or more, and the submicron carbide grains are submicron NbC grains or TaC grains. The invention also discloses a method for preparing a three-dimensional fiber-skeleton toughened cermet. The three-dimensional fiber-skeleton toughened cermet prepared by the method not only has the characteristics of high strength, wear resistance and high hardness of traditional carbide ceramic materials, but also has good Toughness and damage tolerance properties, with broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of cermet materials, and relates to a three-dimensional fiber skeleton toughened cermet and a preparation method thereof. Background technique [0002] Cermets have the advantages of high melting point, high hardness and high chemical stability, and are ideal materials for high-speed cutting tools, jet engine blades, rocket tailpipes, high-temperature molds and wear-resistant parts. However, the inherent high brittleness of cermets seriously limits the further popularization and application of carbide cermets. At present, widely used cermets mainly use metal carbides and oxides as hard phases, and metal phases such as Co, Ni, and Fe as binder phases, which have ultra-high strength and hardness. However, because of its low toughness and damage tolerance, the failure mode of cermets mainly manifests as sudden brittle fracture. Taking the cold-pressed tungsten carbide mold in the actual production process as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14C22C47/06C22C49/02C22C49/14C22C111/02
CPCC22C47/06C22C47/14C22C49/02C22C49/14
Inventor 钟黎声朱建雷曹保卫梁淑华邹军涛许云华
Owner XIAN UNIV OF TECH
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