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Preparation method of rare-earth modified Co-cladded wolfram carbide hard alloy composite powder

A technology of cobalt-coated tungsten carbide and cemented carbide, applied in the coating and other directions, can solve the problems of easy introduction of impurities, easy segregation, long time consumption of cemented carbide, etc. Effect

Active Publication Date: 2010-12-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to prepare cemented carbide by ball milling and mixing powder, which has the problems of long time consumption, easy introduction of impurities, and easy segregation of Co; and provides a preparation method of rare earth modified cobalt-coated tungsten carbide cemented carbide composite powder

Method used

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  • Preparation method of rare-earth modified Co-cladded wolfram carbide hard alloy composite powder
  • Preparation method of rare-earth modified Co-cladded wolfram carbide hard alloy composite powder
  • Preparation method of rare-earth modified Co-cladded wolfram carbide hard alloy composite powder

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specific Embodiment approach 1

[0012] Specific embodiment one: the preparation method of rare earth modified cobalt-coated tungsten carbide cemented carbide composite powder in this embodiment is carried out according to the following steps: one, under room temperature, CoCl 2 ·6H 2 O was dissolved in ethanol to prepare CoCl with a concentration of 40.36g / L 2 solution, and then add micron-sized WC powder into CoCl according to the composition designed for cemented carbide rare earth modified cobalt-coated tungsten carbide composite powder 2 In the solution, 'Ultrasonic stirring, add 80% hydrazine hydrate, the addition of 80% hydrazine hydrate is CoCl 2 2 / 5 of the volume of the solution, continue ultrasonic stirring for 5 minutes, add NaOH saturated aqueous solution, the amount of NaOH saturated aqueous solution is the same as that of hydrazine hydrate, ultrasonically stir for 30 minutes, let stand for 2 hours, pour off the supernatant, and wash the precipitate with distilled water for five first, and then...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the ultrasonic frequency of the ultrasonic stirring is 28KHz, and the ultrasonic power is 100-200W. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific implementation mode three: In this implementation mode, rare earth modified cobalt-coated tungsten carbide cemented carbide composite powder: WC-10Co-0.5Ce 2 o 3 , the specific preparation method is carried out according to the following steps: one, the CoCl 2 ·6H 2 O was dissolved in ethanol to prepare CoCl with a concentration of 40.36g / L 2 solution, then add 100mL CoCl to 8.95g micron WC powder 2 In the solution, stir ultrasonically, add 80% hydrazine hydrate (model is: 80%, produced by Jinan Luli Chemical Co., Ltd.), the addition of 80% hydrazine hydrate is CoCl 2 2 / 5 of the volume of the solution, continue ultrasonic stirring for 5 minutes, add NaOH saturated aqueous solution, the amount of NaOH saturated aqueous solution is the same as that of hydrazine hydrate, ultrasonically stir for 30 minutes, let stand for 2 hours, pour off the supernatant, and wash the precipitate with distilled water for five times, and then dried in a water bath at 70°C for 30...

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Abstract

The invention discloses a preparation method of rare-earth modified Co-cladded wolfram carbide hard alloy composite powder, which relates to a preparation method of hard alloy powder. The invention solves the problems of long time consumption, easy introduction of impurities and easy segregation of Co in the preparation process of a hard alloy by using ball-milled mixed powder. The preparation method comprises the steps of: 1. dissolving CoCl2.6H2O in alcohol, adding WC (Wolfram Carbide) powder, ultrasonically stirring, adding hydrazine hydrate, ultrasonically stirring continuously, adding a NaOH saturated aqueous solution, ultrasonically stirring, standing, pouring liquid supernatant away, washing precipitate with distilled water, carrying out water bathing, and drying; and 2. adding a CeCl3.7H2O aqueous solution, mixing uniformly, stirring continuously, adding a hydrazine hydrate aqueous solution, stirring at a room temperature for reaction, carrying out centrifugal separation, washing with distilled water, carrying out water bathing, and drying to obtain the rare-earth modified Co-cladded wolfram carbide hard alloy composite powder. The preparation method has the advantages of simple process, high production efficiency and low production cost, and the prepared product has high purity and strength.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide composite powder. Background technique [0002] Cemented carbide is mainly composed of two phases of WC and Co. WC constitutes the framework of the force, endowing the cemented carbide with high hardness; Co is the binder phase, endowing the cemented carbide with good toughness. In the traditional cemented carbide preparation method, WC and Co powder are mechanically mixed, it is difficult to obtain very uniform mixing, and it takes a long time, and the ball milling time is usually several hours or even ten hours; because cemented carbide is expensive, the factory Ball milling can not use the ball milling pot with the same composition as the powder (tungsten carbide), steel pots are often used, the steel hardness is low, a large amount of Fe is mixed into the powder during ball milling; and the powder mixing effect is not good, the powder is mechanically bonded, and the bond is not good....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C22C29/08C22C1/04
Inventor 王铀方强王成彪
Owner HARBIN INST OF TECH
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