A method for preparing low-cobalt, ultrafine-grained cemented carbide rods with nano-wc-co composite powder

A cemented carbide rod and composite powder technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of uneven growth of alloys, uneven mixing, and dirty materials, so as to reduce sintering activity and reduce sintering. Powder active, uniform distribution effect

Active Publication Date: 2019-09-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding Co powder and inhibitor, through the process of wet grinding and dry granulation, powder wet grinding will produce lattice distortion, cause material fouling, and uneven mixing, so that the alloy is easy to form uneven growth, cobalt pool, and addition. Coarse and other defects

Method used

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  • A method for preparing low-cobalt, ultrafine-grained cemented carbide rods with nano-wc-co composite powder
  • A method for preparing low-cobalt, ultrafine-grained cemented carbide rods with nano-wc-co composite powder
  • A method for preparing low-cobalt, ultrafine-grained cemented carbide rods with nano-wc-co composite powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The present embodiment prepares ultra-fine-grained cemented carbide rods according to the following steps:

[0052] 1) Kneading with molding agent

[0053] Select nano-WC-6Co composite powder with Co-coated WC grain size ≤ 200nm and Co mass content of 6%;

[0054] Add 1.32kg of tetralin, 0.35kg of cellulose, 0.03kg of soybean ammonium, and 0.34kg of paraffin into a stirrer heated to 100°C, heat and stir until a clear, bubble-free sol state is obtained to obtain a molding agent;

[0055] Add 30kg of nano WC-6Co composite powder into the kneader, and then add the forming agent; start the kneader, evacuate for 5 minutes, then heat, set the temperature to 60°C for 3 hours, keep stirring during the heating process; then stir and knead at a constant temperature of 60°C 1 hour; finally water cooling for 45 minutes, stirring and crushing during the cooling process to obtain mixed material granules.

[0056] The SEM image of the raw material nano WC-6Co composite powder used i...

Embodiment 2

[0082] The present embodiment prepares ultra-fine-grained cemented carbide rods according to the following steps:

[0083] 1) Kneading with molding agent

[0084] Select nano-WC-3Co composite powder with Co-coated WC grain size ≤ 200nm and Co mass content of 3%;

[0085] Add 1.42kg of tetralin, 0.40kg of cellulose, 0.036kg of soybean ammonium, and 0.45kg of paraffin into a stirrer heated to 100°C, heat and stir until a clear, bubble-free sol state is obtained to obtain a molding agent;

[0086] Add 30kg of nano WC-3Co composite powder into the kneader, and then add the forming agent; start the kneader, evacuate for 5 minutes, then heat, set the temperature to 60°C for 3 hours, keep stirring during the heating process; then stir and knead at a constant temperature of 60°C 1 hour; finally water cooling for 45 minutes, stirring and crushing during the cooling process to obtain mixed material granules.

[0087] 2) Extrusion molding

[0088] Get 30kg of the mixed material granul...

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Abstract

The invention discloses a method for preparing low-cobalt, ultra-fine-grained hard alloy rods with nano-WC-Co composite powders. The nano-WC-Co composite powders are used as raw materials, kneaded by mixing molding agents, extruded, The process of blank drying and pressure sintering is to obtain ultra-fine-grained cemented carbide rods. The method of the present invention does not need alcohol wet grinding, spray granulation and other processes, and avoids the problems of uneven wet grinding materials, dirty materials, and lattice distortion caused by ball milling, and the obtained ultrafine-grained hard alloy has high hardness and good wear resistance , high density, small WC grains and uniform grain size.

Description

technical field [0001] The invention relates to a method for preparing low-cobalt, ultra-fine-grained hard alloy rods. The ultra-fine-grained hard alloy rod prepared by the method can be processed into a drill bit or a milling cutter, and is applied to heat treatment ≥ HRC60 stainless steel material, aluminum-magnesium alloy, printed circuit board (PCB) and high wear resistance material processing, etc. Background technique [0002] In order to meet the requirements of 3C products (computers, communications and consumer electronics) for high integration, lightness, miniaturization, anti-collision, electromagnetic shielding and heat dissipation, the shell materials of 3C products have changed from ABB and PC to aluminum-magnesium alloys and titanium. Development and application of alloy materials. And with the development of 5G network era, wireless charging and other technologies, in order to solve the problem that the metal back cover is not conducive to the antenna signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/20B22F3/14B22F3/10B22F1/00C22C29/08C22C1/05
CPCC22C1/051C22C29/005C22C29/08B22F3/1021B22F3/14B22F3/20B22F1/102
Inventor 朱二涛张久兴杨新宇
Owner HEFEI UNIV OF TECH
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