Preparation method of hard alloy with orientational distribution of featured crystal surfaces of WC crystal grains

A technology of crystal plane orientation and cemented carbide, which is applied in the field of cemented carbide preparation, can solve problems such as difficult to meet the hardness and wear resistance of cemented carbide bulk materials, and achieve accurate repeatability and uniform composition distribution Effect

Active Publication Date: 2015-05-13
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The cemented carbide products that are actually used at this stage are all bulk materials with isotropic structure and mechanical properties obtained by traditional preparation methods, which are difficult to meet the industrial applications that have special requirements for the hardness and wear resistance of cemented carbide bulk materials
In view of the research status of cemented carbide materials with characteristic crystal plane orientation distribution at home and abroad, we have developed an in-situ reaction sintering technology with simultaneous reaction and sintering to prepare WC-Co cemented carbide with characteristic crystal plane orientation distribution of WC grains. Block materials, this method has not been reported at home and abroad

Method used

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  • Preparation method of hard alloy with orientational distribution of featured crystal surfaces of WC crystal grains
  • Preparation method of hard alloy with orientational distribution of featured crystal surfaces of WC crystal grains
  • Preparation method of hard alloy with orientational distribution of featured crystal surfaces of WC crystal grains

Examples

Experimental program
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Effect test

Embodiment 1

[0022] with WO 2.9 , a mixture of cobalt oxide and carbon black as raw materials, according to the final preparation of pure WC phase and Co phase, the composition of WC-12wt.% Co cemented carbide block material requirements, the above raw materials are mixed in proportion and ball milled , the uniformly refined mixed powder is placed in a vacuum drying oven for drying treatment; the dried mixed powder is cold-pressed into a billet, and placed in a vacuum reaction furnace for in-situ reduction carbonization reaction, the reaction temperature is 650 ° C, The heat preservation time is 30min, and the WC-Co-η composite powder (see figure 1); place the WC-Co-η composite powder in a sintering system that can apply pressure for reaction sintering and densification. The process parameters are: first apply a pressure of 30MPa, heat up to 600°C at a heating rate of 50°C / min, and hold for 10min Then increase the pressure to 100MPa, raise the temperature to 1100°C at a heating rate of 50...

Embodiment 2

[0024] with WO 3 , a mixture of cobalt oxide and carbon black as raw materials, according to the final preparation of pure WC phase and Co phase, the composition of WC-10wt.% Co cemented carbide block material requirements, the above raw materials are mixed in proportion and ball milled , the uniformly refined mixed powder is placed in a vacuum drying oven for drying treatment; the dried mixed powder is cold-pressed into a billet, and placed in a vacuum reaction furnace for in-situ reduction carbonization reaction, the reaction temperature is 730 ° C, The holding time is 45min, and the WC-Co-η composite powder with carbon-deficient phase composition is synthesized (its phase diagram is basically the same as figure 1 ); place the WC-Co-η composite powder in a sintering system that can apply pressure for reaction sintering and densification. The process parameters are: first apply a pressure of 45MPa, heat up to 700°C at a heating rate of 30°C / min, and hold for 10 minutes Then ...

Embodiment 3

[0026] with WO 2.72 , a mixture of cobalt oxide and carbon black as raw materials, according to the final preparation of pure WC phase and Co phase, the composition of WC-8wt.% Co cemented carbide block material requirements, the above raw materials are mixed in proportion and ball milled , the uniformly refined mixed powder is placed in a vacuum drying oven for drying treatment; the dried mixed powder is cold-pressed into a billet, and placed in a vacuum reaction furnace for in-situ reduction carbonization reaction, the reaction temperature is 800 ° C, The holding time is 60min, and the WC-Co-η composite powder with carbon-deficient phase composition is synthesized (its phase diagram is basically the same as figure 1 ); place the WC-Co-η composite powder in a sintering system that can apply pressure for reaction sintering and densification. The process parameters are: first apply a pressure of 30MPa, heat up to 800°C at a heating rate of 10°C / min, and hold for 10min Then inc...

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Abstract

The invention discloses a preparation method of hard alloy with orientational distribution of featured crystal surfaces of WC crystal grains and belongs to the technical field of hard-alloy metallurgy. The preparation method comprises the following steps of: by adopting a mixture of tungsten oxide, cobalt oxide and carbon material as a raw material, carrying out mixed ball grinding; carrying out cold pressing on ball-ground mixed powder to form a blank, and putting the blank in a vacuum reaction furnace to carry out in-situ reduction and carbonization reaction to obtain WC-Co composite powder containing carbon-deficient phase components under lower temperature; and finally, putting the prepared composite powder in a sintering system which can apply sintering pressure to carry out in-situ reaction sintering densification on the powder to obtain the hard-alloy block material with orientational distribution of the featured crystal surfaces of the WC crystal grains. The preparation method has the advantages of simple process step, short preparation period and low sintering temperature and the like in the aspects of preparing the composite powder and sintering the hard-alloy block material; and the hard-alloy block prepared by sintering has controllable size of the WC crystal grains, obvious anisotropy of structures and mechanical properties and strong repeatability.

Description

technical field [0001] The invention relates to a preparation method of WC-Co cemented carbide with characteristic crystal plane orientation distribution, which can be prepared by applying appropriate sintering pressure at a specific stage to obtain anisotropic mechanical properties, ultra-high hardness in a specific direction and The invention discloses a hard alloy bulk material with wear resistance, belonging to the technical field of hard alloy preparation. Background technique [0002] WC-Co cemented carbide has excellent comprehensive mechanical properties of hardness, toughness and strength, and is widely used in the fields of cutting tools and wear-resistant parts. With the continuous development of industrial technology, the mechanical properties and use requirements of cemented carbide products are also increasing. The microstructure of an alloy determines its macroscopic mechanical properties. In WC-Co cemented carbide, the grain size and distribution of the WC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 宋晓艳王西龙刘雪梅王海滨聂祚仁
Owner BEIJING UNIV OF TECH
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