Industrial production method for synthesizing cemented carbide block material in situ

A cemented carbide block and in-situ synthesis technology, applied in the field of cemented carbide, can solve the problems of large energy consumption, long process, complex process, etc., and achieve strong controllability, short process, and reduction of waste gas and waste liquid The effect of emissions

Active Publication Date: 2012-06-27
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide an industrial production method for in-situ synthesis of cemented carbide bulk materials,

Method used

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  • Industrial production method for synthesizing cemented carbide block material in situ
  • Industrial production method for synthesizing cemented carbide block material in situ
  • Industrial production method for synthesizing cemented carbide block material in situ

Examples

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Example

[0030] Example 1: The final product is WC-6wt.% Co (YG6) cemented carbide bulk material. According to the requirements of Co content in YG6 cemented carbide, according to the actual conditions of Co loss of 1.5% (m=1.5), total carbon content increased by 0.2% (p=0.2) and material loss coefficient of k=1.02 in hot pressing sintering, according to The mass ratio is 110.81:8.28:24.20 with WO 2.9 、Co 3 o 4 Ball milling and mixing with carbon black, and then according to the ratio of the mass of the sintered sample to the mass of the mixed powder is 1:1.29, the mixed oxide powder is weighed and filled into a mold, and sintered in a hot-press sintering furnace. The hot-pressing sintering process parameters are: pressure 10MPa, heating up to 375°C at a heating rate of 30°C / min, and holding for 1 hour; then raising the temperature to 1000°C, holding for 3 hours; ℃, and increase the pressure to 30MPa, keep the temperature and pressure for 60 minutes; finally keep the pressure and co...

Example

[0031] Example 2: The final product is WC-10wt.% Co (YG10) cemented carbide bulk material. According to the requirements of Co content in YG10 cemented carbide, according to the actual conditions of Co loss in vacuum sintering of 0.3% (m=0.3), total carbon content increased by 0.15% (p=0.15) and material loss coefficient of k=1.00, according to the actual conditions The ratio of WO is 106.16:13.64:23.64 2.9 、Co 3 o 4 Carry out ball milling and mixing with carbon black, weigh the oxide mixed powder according to the ratio of sintered sample mass to mixed powder mass ratio of 1:1.22, fill it into a mold for cold pressing, and sinter the mold and powder together in vacuum Sintering in the furnace. The process parameters of vacuum sintering are as follows: heat up to 375°C and hold for 1 hour; then raise the temperature to 950°C at a rate of 8°C / min and hold for 2 hours; then raise the temperature to 1400°C and hold for 1.5 hours; finally cool down to room temperature with the f...

Example

[0032] Example 3: The final product is WC-15wt.% Co (YG15) cemented carbide bulk material. According to the requirements of Co content in YG15 cemented carbide, according to the actual conditions of Co loss 2.5% (m=2.5) in low pressure sintering, total carbon content increased by 0.3% (p=0.3) and material loss coefficient k=1.05, according to the actual conditions The ratio of WO is 99.86:20.91:22.05 2.9 、Co 3 o 4 Ball milling and mixing with carbon black, according to the ratio of sintered sample mass to mixed powder mass ratio of 1:1.20, the oxide mixed powder is weighed and filled into a mold, and sintered in a low-pressure sintering furnace. The sintering process parameters are as follows: heat up to 400°C for 1 hour; then heat up to 980°C at a rate of 7°C / min and hold for 3 hours; Inject 5MPa argon gas, keep the temperature and pressure for 30 minutes; finally cool down to room temperature with the furnace. The XRD spectrum and microstructure of the YG15 cemented carb...

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Abstract

The invention discloses an industrial production method for synthesizing a cemented carbide block material in situ, belonging to the technical field of cemented carbide. The industrial production method comprises the steps of: utilizing WO 2.9, Co3O4 and carbon black as raw materials, calculating a dosage ratio of the three raw materials by considering the evaporation capacity and wastage of Co and carbon wastage caused by carrying powder in an oxidizing gas during the preparation process according to the demand of a final Co content, ball grinding the raw materials to mix the same, and calculating the mass of the necessary raw material powder according to the material mass reduction and the sintering wastage coefficient k of the WC and Co powder during the sintering process; and utilizing the low sintering pressure at the primary application stage of a hot press sintering technique, a vacuum sintering technique or a low pressure sintering technique, periodically maintaining the temperature and periodically increasing the pressure to obtain the cemented carbide block material. The industrial production method of the invention has the advantages of simple technique steps, short process, energy saving and environmental friendly properties, and capability of realizing the large scale industrial production of the cemented carbide.

Description

technical field [0001] The invention belongs to the technical field of hard alloys, and in particular relates to an in-situ synthesis technology of hard alloy block materials suitable for industrial production. Background technique [0002] At present, the most commonly used methods for preparing cemented carbide bulk materials in industrial production are: reducing tungsten oxide and long-term high-temperature carbonization to prepare WC powder; reducing cobalt oxide powder to prepare Co powder; and then The two powders are mixed by ball milling, and then pressed into shape after adding a forming agent; finally, they are sintered and densified in a sintering device to prepare a bulk cemented carbide material. However, this method has the disadvantages of many processes (at least five main processes), long process (at least more than seven days), easy introduction of impurities, and large energy consumption. [0003] Zhang Jiuxing and others proposed a method for preparing ...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 刘雪梅宋晓艳魏崇斌高杨王海滨付军王瑶
Owner BEIJING UNIV OF TECH
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