Method for preparing novel carbon fiber toughened Ti (C,N) based metal ceramic material

A carbon fiber and metal-based technology, applied in the field of new high-performance Ti-based cermet materials and their preparation, can solve the problems of easy damage and fracture of finished carbon fibers, performance constraints of composite materials, and difficult processing, and achieve good surface integrity and excellent The effect of improving wear resistance, strength and toughness

Inactive Publication Date: 2015-05-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, directly adding inorganic carbon fibers to the composite ceramic matrix is ​​difficult to effectively mix and process due to the compatibility of the two, and the finished carbon fibers are easily damaged and broken during the mixing process. restrict

Method used

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  • Method for preparing novel carbon fiber toughened Ti (C,N) based metal ceramic material
  • Method for preparing novel carbon fiber toughened Ti (C,N) based metal ceramic material
  • Method for preparing novel carbon fiber toughened Ti (C,N) based metal ceramic material

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Experimental program
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preparation example Construction

[0031]The preparation method comprises the following process steps and contents:

[0032] (1) Weighing: Weigh raw materials according to the composition designed for the novel Ti(C,N)-based cermet, and add 0-15% (mass fraction) of organic dispersant and binder.

[0033] (2) Mixing: Add the Ti(C, N) powder, metal binder powder, and grain inhibitor powder weighed in proportion to the high-energy stirring ball mill tank, and add organic dispersant and binding agent, WC grinding balls and solvent, after stirring and milling for 48-72 hours, add chopped polyacrylonitrile pre-oxidized fiber for ball milling for 0.5-2 hours.

[0034] (3) Drying: In a vacuum drying oven, dry the finely ground and evenly mixed slurry at a controlled temperature of 40-100°C, time of 40-60h, and vacuum degree of 0-1Pa.

[0035] (4) Grinding and sieving: Grind the dried powder and select a sieve with a suitable aperture for sieving.

[0036] (5) Loading: put the prepared composite powder into a sinterin...

Embodiment 1

[0041] The manufacturing method and technological process of the novel high-performance Ti(C, N)-based cermet of the embodiment of the present invention are as follows:

[0042] (1) Weighing: 80% Ti(C, N) powder by mass fraction, 10% Ni powder, 5% Mo 2 C powder, 5% polyacrylonitrile preoxidized fiber Weigh each reagent.

[0043] (2) Mixing: Put the weighed raw material Ti(C,N) powder, metal binder powder, and grain inhibitor powder into a high-energy stirring ball mill tank, and add 10 times the mass of WC grinding balls and 5 times the mass of quality of absolute ethanol solvent, stirred and ball milled for 71 hours, added chopped polyacrylonitrile pre-oxidized fibers to the slurry, and then ball milled for 0.5 hours.

[0044] (3) Drying: Vacuum drying is adopted, the temperature is controlled at 100°C, the time is 40h, and the vacuum degree is -0.33Pa.

[0045] (4) Grinding and sieving: After grinding the dried powder, select a sieve with an aperture of 1mm to sieve.

[0...

Embodiment 2

[0051] The manufacturing method and technological process of the novel high-performance Ti(C, N)-based cermet of the embodiment of the present invention are as follows:

[0052] 1) Weighing: 60% Ti(C, N) powder by mass fraction, 10% Ni powder, 5% NbC powder, 5% Mo 2 C powder, 20% polyacrylonitrile preoxidized fiber Weigh each reagent, and add 10% organic dispersant and adhesive.

[0053] 2) Mixing: Put the weighed raw material Ti(C,N) powder, metal binder powder, and grain inhibitor powder into a high-energy stirring ball mill tank, and add 10 times the mass of WC grinding balls and 5 times the mass of After stirring and ball milling for 71 hours, add chopped polyacrylonitrile preoxidized fibers to the slurry, and then ball mill for 1.5 hours.

[0054] 3) Drying: Vacuum drying is adopted, the temperature is controlled at 60°C, the time is 48h, and the vacuum degree is -1Pa.

[0055] 4) Grinding and sieving: After grinding the dried powder, select a sieve with an aperture of ...

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Abstract

The invention relates to a method for preparing a high-performance Ti (C,N) based metal ceramic material, and belongs to the fields of high-tech structural ceramic and application thereof. The high-performance Ti (C,N) based metal ceramic material is prepared from the following components in percentage by mass: 50-80% of nano or micron Ti(C,N) powder as a matrix, 10-20% of metals Mo and Ni as adhesives, 5-10% of NbC, Mo2C, VC and Cr3C2 as crystalline grain inhibitors and 5-30% of polyacrylonitrile pre-oxidized fiber as a precursor in the presence of inert atmospheres through hot pressing sintering. Due to in-situ pyrolysis of the polyacrylonitrile pre-oxidized fiber in the sintering process for generating carbon fiber, the ceramic-based composite material can be toughened, the sintered body is good in fiber formation and uniform in tissue structure, and the prepared material is high in hardness, high in strength, good in breakage toughness and applicable to manufacturing of high-speed cutting tools, molds, geological drills and the like.

Description

technical field [0001] The invention relates to a novel high-performance Ti(C,N)-based cermet material and a preparation method thereof, belonging to the field of high-tech structural ceramics and their applications. Background technique [0002] Cutting tools are the key factors to support and promote the progress of mechanical processing technology. Their performance and quality directly affect the processing efficiency and processing quality, and are related to the production technology level and economic benefits of the entire machinery manufacturing industry. Although traditional WC-Co cemented carbide is widely used in cutting processing, if it encounters superhard workpieces or continuous cutting for a long time, it needs to further improve its mechanical properties. This is to develop higher hardness, better red hardness and high Materials with strength and good toughness create opportunities. Ti(C,N)-based cermets use Ti(C,N) as the hard phase, metal Ni, Mo, etc. a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/14C22C47/14C22C101/10
Inventor 彭志坚翟羽佳任小勇王成彪
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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