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A kind of twin crystal heterogeneous cemented carbide and its preparation method

A cemented carbide and non-uniform technology, applied in the field of powder metallurgy, can solve the problems of harsh production conditions, poor performance of cemented carbide, high production cost, etc., and achieve the effect of reducing production cost, good strength and toughness, and wide sources

Active Publication Date: 2022-01-28
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to achieve the above purpose, the present invention provides a twin-crystal heterogeneous cemented carbide and its preparation method, which can reduce the production cost of ultrafine WC powder, simplify the production process, improve the performance of the alloy, and solve the non-uniform preparation existing in the prior art. In the process of cemented carbide, it is necessary to use specially prepared ultra-coarse WC powder and ultra-fine WC powder. The production cost is high, the production conditions are harsh, and the performance of the prepared cemented carbide is poor.

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  • A kind of twin crystal heterogeneous cemented carbide and its preparation method
  • A kind of twin crystal heterogeneous cemented carbide and its preparation method
  • A kind of twin crystal heterogeneous cemented carbide and its preparation method

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Embodiment 1

[0043] A preparation method of twin crystal heterogeneous cemented carbide, comprising the following steps:

[0044] S10. Preparation of fine-grained precursor calcined powder:

[0045] S11, according to the WO in the ammonium tungstate solution 3 , The mass ratio of glucose is 1:0.5, and the ammonium tungstate solution and glucose are weighed respectively; wherein, the WO in the ammonium tungstate solution 3 The content is 200g / L;

[0046] S12. Add the glucose weighed in S11 to the ammonium tungstate solution weighed in S11 to form a system, and add water to the system. 3 The content is 100g / L, fully stir until the glucose and water-soluble tungsten salt are completely dissolved, and the system is evenly mixed to obtain a mixed solution;

[0047] S13. Spray-dry the mixed liquid obtained in S12 to obtain a precursor powder; wherein, the spray-drying adopts a pressure spray dryer, the inlet temperature is 150°C, the outlet temperature is 100°C, and the feed rate is 200ml / min...

Embodiment 2

[0054] A preparation method of twin crystal heterogeneous cemented carbide, comprising the following steps:

[0055] S10. Preparation of fine-grained precursor calcined powder:

[0056] S11, according to the WO in the ammonium tungstate solution 3 The mass ratio of glucose and glucose is 1:1, respectively weigh ammonium tungstate solution and glucose; wherein, the WO in the ammonium tungstate solution 3 The content is 300g / L;

[0057] S12. Add the glucose weighed in S11 to the ammonium tungstate solution weighed in S11 to form a system, and add water to the system. 3 The content is 150g / L, fully stir until the glucose and water-soluble tungsten salt are completely dissolved, and the system is evenly mixed to obtain a mixed solution;

[0058] S13. Spray-dry the mixed liquid obtained in S12 to obtain a precursor powder; wherein, the spray-drying adopts a pressure spray dryer, the inlet temperature is 280°C, the outlet temperature is 150°C, and the feed rate is 500ml / min;

[...

Embodiment 3

[0064] A preparation method of twin crystal heterogeneous cemented carbide, comprising the following steps:

[0065] S10. Preparation of fine-grained precursor calcined powder:

[0066] S11, according to the WO in the ammonium tungstate solution 3 , The mass ratio of glucose is the ratio of 2.5:2.1, and the ammonium tungstate solution and glucose are weighed respectively; wherein, the WO in the ammonium tungstate solution 3 The content is 250g / L;

[0067] S12. Add the glucose weighed in S11 to the ammonium tungstate solution weighed in S11 to form a system, and add water to the system. 3 The content is 125g / L, fully stir until the glucose and water-soluble tungsten salt are completely dissolved, and the system is evenly mixed to obtain a mixed solution;

[0068] S13. Spray-dry the mixed liquid obtained in S12 to obtain a precursor powder; wherein, the spray-drying adopts a pressure spray dryer, the inlet temperature is 215°C, the outlet temperature is 125°C, and the feed ra...

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Abstract

The invention discloses a twin-crystal heterogeneous hard alloy and a preparation method thereof. The preparation method comprises: preparing a fine-grain precursor calcined powder; preparing the fine-grain precursor calcined powder, coarse WC powder, cobalt powder, and paraffin Proportional mixing, and then ball milling to obtain the mixed material; the mixed material is pressed and molded to obtain a molded body; under an argon atmosphere, the molded body is heated to 1410°C~1470°C to reach the sintering temperature, and then pressurized and heat-preserved , The sintered product obtained after cooling is twin crystal heterogeneous cemented carbide. The double-crystal heterogeneous hard alloy and the preparation method thereof of the present invention reduce the production cost of ultra-fine WC powder, simplify the production process, improve the performance of the alloy, and solve the problem in the prior art that special methods need to be used in the process of preparing heterogeneous hard alloy. The prepared ultra-coarse WC powder and ultra-fine WC powder have the problems of high production cost, harsh production conditions, and poor performance of the prepared cemented carbide.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a twin-crystal heterogeneous hard alloy and a preparation method thereof. Background technique [0002] Tungsten-cobalt cemented carbide is composed of high-strength WC hard phase and high-toughness Co binder phase. It has excellent characteristics such as high hardness, wear resistance, heat resistance, and corrosion resistance. It is known as "the tooth of industry" , are widely used in aerospace, national defense, military industry, automobile, machinery, electronics, petroleum, chemical industry, steel, papermaking, nuclear energy and other technical fields, and play a vital role in the development of national economy, national defense industry, and science and technology. In recent years, with the advancement of science and technology, the requirements for the performance of tungsten-cobalt cemented carbide are also increasing. [0003] At present, the main methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/055C22C29/08C22C29/067
Inventor 羊求民唐彦渊陈丽勇徐国钻毛莉
Owner JIANGXI UNIV OF SCI & TECH