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A multi-scale self-lubricating tungsten carbide matrix composite material and its preparation method

A tungsten carbide-based, composite material technology, applied in the field of metal-ceramic composite materials, can solve the problems of fracture failure frequency and poor toughness, and achieve the effect of improving toughness, high-efficiency fiber toughening, and broad application prospects.

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

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to provide a multi-scale self-lubricating tungsten carbide-based composite material, which solves the problems of poor toughness and high frequency of sudden fracture and failure in existing cermet materials

Method used

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  • A multi-scale self-lubricating tungsten carbide matrix composite material and its preparation method
  • A multi-scale self-lubricating tungsten carbide matrix composite material and its preparation method
  • A multi-scale self-lubricating tungsten carbide matrix composite material and its preparation method

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preparation example Construction

[0033] A method for preparing a multi-scale self-lubricating tungsten carbide-based composite material of the present invention comprises the following steps:

[0034] Step 1, weigh the following components respectively: WC particles, Fe powder, Nb powder, graphite powder and MoS 2 powder; wherein, the mass percentage of WC particles is 53-76%, the mass percentage of Fe powder is 3.1-14%, the mass percentage of Nb powder is 9.5-19%, the mass percentage of graphite powder is 0.2-4.5%, MoS 2 The mass percentage of the above components is 4.5-13%, and the sum of the mass percentages of the above components is 100%;

[0035] Step 2: WC particles, Fe powder, Nb powder, graphite powder and MoS 2 The powder is mixed evenly to form a mixed powder;

[0036] Step 3: Add an appropriate amount of paraffin wax powder to the mixed powder in step 2, put it into a mixer for mixing treatment, and form a uniform material; wherein, the particle size of the paraffin wax powder is about 25 μm, a...

Embodiment 1

[0041] The preparation of a multi-scale self-lubricating tungsten carbide matrix composite material comprises the following steps:

[0042] Step 1, weigh the following components respectively: WC particles, Fe powder, Nb powder, graphite powder and MoS 2Powder; the average particle size of WC particles is 20 μm, the average particle size of Fe powder is 1 μm, the average particle size of Nb powder is 1 μm, and the purity of the above powders is greater than 99.5%; wherein, the mass fraction of WC is 53%, and the mass fraction of Fe powder is Fraction 13%, mass fraction of Nb powder is 19%, mass fraction of graphite powder is 4.5%, MoS 2 The mass fraction of is 10.5%, and the sum of the mass percentages of the above components is 100%;

[0043] Step 2: Use a low-energy mixer to weigh the WC particles, Fe powder, Nb powder, graphite powder and MoS in step 1 2 The powder is mixed evenly to form a mixed powder, so that the graphite can evenly adhere to the surface of the metal p...

Embodiment 2

[0052] The preparation of a multi-scale self-lubricating tungsten carbide matrix composite material comprises the following steps:

[0053] Step 1, weigh the following components respectively: WC particles, Fe powder, Nb powder, graphite powder and MoS 2 powder; the average particle size of WC particles is 30 μm, the average particle size of Fe powder is 1 μm, the average particle size of Nb powder is 5 μm, MoS 2 The average particle size of the powder is 1 μm, and the purity of the above metal powders is greater than 99.5%. Among them, the mass fraction of WC is 76%, the mass fraction of Fe powder is 5%, the mass fraction of Nb powder is 13.9%, and the mass fraction of graphite powder 0.2%, MoS 2 The mass fraction of is 4.9%;

[0054] Step 2: Use a low-energy ball mill to weigh the WC particles, Fe powder, Nb powder, graphite powder and MoS in step 1 2 The powder is mixed evenly to form a mixed powder, so that the graphite can evenly adhere to the surface of the metal part...

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Abstract

The invention discloses a multi-scale self-lubricating tungsten carbide-based composite material, which is composed of multi-scale particles and metal Nb fibers distributed in a network structure, the multi-scale particles are distributed around the metal Nb fibers, and the multi-scale particles include micron-sized WC particles , submicron NbC particles dispersedly distributed, uniformly distributed self-lubricating phase and binder phase, the volume fraction of micron-sized WC particles in the composite material is 60‑80%, the volume fraction of self-lubricating phase is 2.2‑10%, sub The volume fraction of micron-sized NbC particles is 10-20%, the volume fraction of the binder phase is 2-10%, the volume fraction of metal Nb fibers is 5-10%, and the sum of the volume percentages of the above components is 100%. The invention also discloses a method for preparing a multi-scale self-lubricating tungsten carbide-based composite material. The prepared multi-scale self-lubricating tungsten carbide-based composite material not only has the characteristics of high strength and wear resistance of traditional self-lubricating wear-resistant ceramic materials, but also has good toughness and damage tolerance properties.

Description

technical field [0001] The invention belongs to the technical field of cermet composite materials, and relates to a multi-scale self-lubricating tungsten carbide-based composite material and a preparation method thereof. Background technique [0002] Under harsh working conditions such as high temperature, high wear, and high corrosion environments, materials are required to have high strength, toughness, high wear resistance, and corrosion resistance. Under these conditions, cermets can be used as ideal materials. Further, by adding a solid lubricating medium into the cermet system, the self-lubricating cermet is prepared, so that it has high anti-wear ability and simultaneously has the friction surface to realize self-lubrication. [0003] At present, cermet wear-resistant materials are widely used in automobiles, high-speed rail, and high-speed mechanical brake pads. However, to achieve self-lubrication, there must be certain micropores in the cermet as a diffusion chan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/02C22C49/14C22C47/14C22C47/06C22C111/02
CPCC22C47/062C22C47/14C22C49/02C22C49/14
Inventor 钟黎声朱建雷赵梓源许云华梁淑华邹军涛
Owner XIAN UNIV OF TECH
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