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La2O3-Al2O3-(W, Mo2)C binding phase-free hard alloy material and preparation method thereof

A cemented carbide and no binder phase technology is applied in the field of La2O3-Al2O3-C non-binder phase cemented carbide materials and their preparation, which can solve problems such as the easy occurrence of graphite phases and carbides, and the influence of material performance. Achieve good polishability, excellent corrosion resistance and deformation resistance, and inhibit the growth of WC particles.

Inactive Publication Date: 2018-09-28
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using Fe, Ni and other metals instead of cobalt, although the mechanical properties of the prepared cemented carbide are similar to those of WC-Co system cemented carbide, the graphite phase and carbide are very easy to appear, which will affect the performance of the material.

Method used

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  • La2O3-Al2O3-(W, Mo2)C binding phase-free hard alloy material and preparation method thereof
  • La2O3-Al2O3-(W, Mo2)C binding phase-free hard alloy material and preparation method thereof
  • La2O3-Al2O3-(W, Mo2)C binding phase-free hard alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Heat 500ml of deionized water to 60°C; add ammonium metatungstate (NH 4 ) 6 h 2 W 12 o 40 ·XH 2 O, ammonium molybdate tetrahydrate H 24 Mo 7 N 6 o 24 4H 2 O, lanthanum nitrate hexahydrate LaN 3 o 9 ·6H 2 O, aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O and dextrose monohydrate powder C 6 h 12 o 6 ·H 2 O (the purity of each powder is ≥99.5%), the addition amount is 15.29g, 0.75g, 0.04g, 17.63g and 8.69g respectively, stir to make it dissolve completely and continue to stir for 0.5 hours, continue to heat until the deionized water boils and completely Evaporated to obtain La wrapped by organic carbon source 2 o 3 / Al 2 o 3 / MoO 3 / WO 3 Precursor composite powder.

[0032] 2) The obtained precursor composite powder is placed in a vacuum tube furnace, and H 2 / N 2 Mixed gas, H 2 and high-purity N 2 The gas flow rate is 0.2L / min and 0.4L / min respectively, the carbonization temperature is 1250°C, and the holding time is 2h, and the carbonizat...

Embodiment 2

[0037] 1) Heat 500ml of deionized water to 65°C; add ammonium metatungstate (NH 4 ) 6 h 2 W 12 o 40 ·XH 2 O, ammonium molybdate tetrahydrate H 24 Mo 7 N 6 o 24 4H 2 O, lanthanum nitrate hexahydrate LaN 3 o 9 ·6H 2 O, aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O and dextrose monohydrate powder C 6 h 12 o 6 ·H 2 O (the purity of each powder is ≥99.5%), the addition amount is 15.66g, 0.39g, 0.12g, 16.76g and 8.65g respectively, stir to make it dissolve completely and continue to stir for 1 hour, continue to heat until the deionized water boils and completely Evaporated to give the carbon source La 2 o 3 / Al 2 o 3 / MoO 3 / WO 3 Precursor composite powder.

[0038] 2) The obtained precursor composite powder is placed in a vacuum tube furnace, and H 2 / N 2 Mixed gas, H 2 and high-purity N 2 The gas flow rate is 0.1L / min and 0.3L / min respectively, the carbonization temperature is 1350°C, and the holding time is 2.5h, and the carbonization can obtain nan...

Embodiment 3

[0043] 1) Heat 500ml of deionized water to 70°C; add ammonium metatungstate (NH 4 ) 6 h 2 W 12 o40 ·XH 2 O, ammonium molybdate tetrahydrate H 24 Mo 7 N 6 o 24 4H 2 O, lanthanum nitrate hexahydrate LaN 3 o 9 ·6H 2 O, aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O and dextrose monohydrate powder C 6 h 12 o 6 ·H 2 O (the purity of each powder is more than or equal to 99.5%), the addition amount is 15.53g, 0.91g, 0.08g, 15.43g and 8.92g respectively, stir to make it dissolve completely and continue to stir for 0.7 hours, continue to heat until the deionized water boils and completely Evaporated to give the carbon source La 2 o 3 / Al 2 o 3 / MoO 3 / WO 3 Precursor composite powder.

[0044] 2) The obtained precursor composite powder is passed into H in a vacuum tube furnace 2 / N 2 Mixed gas, H 2 and high-purity N 2 The gas flow rate is 0.1L / min and 0.3L / min respectively, the carbonization temperature is 1300°C, and the holding time is 3h, and the carboniz...

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Abstract

The invention discloses a method for preparing a La2O3-Al2O3-(W, Mo2)C binding phase-free hard alloy. The method comprises the following steps: adding ammonium metatungstate, ammonium molybdate, lanthanum nitrate hexahydrate, aluminum nitrate nonahydrate and glucose into deionized water and stirring, continuously heating to be boiling and evaporating so as to obtain a precursor composite powder; adding the precursor composite powder into a closed tube furnace, vacuumizing, introducing mixed gas of H2 and N2, and carbonizing to obtain a composite powder; adding the composite powder into a SPS (Spark Plasma Sintering) furnace, and preparing the binding phase-free hard alloy under reaction conditions. According to the method disclosed by the invention, strategic metal cobalt is replaced withalumina toughened particles, a nano-scale composite powder is prepared by using a chemical liquid mixing method, and finally the binding phase-free hard alloy with excellent overall performance is prepared by using the SPS furnace, and has excellent corrosion and deformation resistance, excellent polishability and high red hardness.

Description

technical field [0001] The invention relates to the field of alloy preparation, in particular to a La 2 o 3 -Al 2 o 3 -(W,Mo 2 ) C no binder phase cemented carbide material and its preparation method. Background technique [0002] SPS spark plasma sintering (Spark Plasma Sintering) is a new technology for preparing functional materials. Its advantages are energy saving, environmental protection, controllable structure, short sintering time and fast heating speed. It can be used to prepare ceramic materials, metal materials, Composite materials, this technology has also been widely used in the preparation of amorphous bulk materials, nano-block materials, gradient materials and other fields. Japan obtained the patent of spark sintering technology in the 1960s, but because of technical difficulties related to equipment cost, industrial production and sintering efficiency, it has not been widely used. In the 1880s, the Inoue Research Institute developed the first SPS devi...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/626
CPCC04B35/5607C04B35/62665C04B2235/3217C04B2235/3227C04B2235/666C04B2235/77C04B2235/785C04B2235/96
Inventor 郭世柏郭涛胡涛胡忠举蔡春波易正翼段晓云乔玉芳
Owner HUNAN UNIV OF SCI & TECH
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