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Large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and preparation method

A cemented carbide, large aspect ratio technology, applied in the field of powder metallurgy, to reduce processing difficulty, save mineral resources, and solve the effect of uneven distribution of feeding

Active Publication Date: 2015-11-25
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, the sintering of ultra-fine-grained cemented carbide has gradually matured, but there are still great challenges in obtaining stable ultra-fine-grained WC-Co alloys with high shrinkage rates

Method used

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  • Large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and preparation method
  • Large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and preparation method
  • Large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of ultra-fine-grained WC-10Co cemented carbide stepped rod with large aspect ratio:

[0028] (1) Will contain vanadium carbide (VC, 0.35wt%), chromium carbide (Cr 3 C 2 , 0.45wt%) superfine tungsten carbide powder and cobalt powder are added in proportion to the ball mill irrigation, wet milled for 30h, vacuum dried after discharge, and sieved with 320 meshes to obtain the mixture powder; wherein the superfine tungsten carbide powder BET particle size is 0.60μm, Co content is 10%;

[0029] (2) choose each component of wax-based binder to form and the mass percentage composition of each component to be: wax is the high-purity paraffin wax of Thiel hard alloy, accounts for 63% altogether; Macromolecular polymerization is high-density polyethylene, Polypropylene and ethylene-vinyl acetate copolymer account for 30% in total; low-molecular coupling agents are stearic acid and dioctyl phthalate, accounting for 7% in total.

[0030] (3) Mix the wax-base...

Embodiment 2

[0036] A method for preparing an ultra-fine-grained WC-12Co cemented carbide stepped rod with a large aspect ratio:

[0037] (1) will contain chromium carbide (Cr 3 C 2 , 0.35wt%) superfine tungsten carbide powder and cobalt powder are added in proportion to the ball mill irrigation, wet milled for 48h, vacuum-dried after discharging, and sieved with 320 orders to obtain the mixture powder; wherein the superfine tungsten carbide powder BET particle size is 0.32μm, Co content is 12%;

[0038] (2) choose each component of wax-based binder to form and the mass percentage composition of each component to be: wax is the high-purity paraffin wax of Thiel hard alloy, accounts for 63% altogether; Macromolecular polymerization is high-density polyethylene, Polypropylene accounts for 30% in total; low-molecular coupling agents are stearic acid and dioctyl phthalate, accounting for 7% in total.

[0039](3) Mix the wax-based binder in step (2) with the mixture powder obtained in step (...

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Abstract

The invention belongs to the technical field of powder metallurgy, and in particular, relates to a large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and a preparation method. The preparation method comprises the following steps: (1) ultrafine tungsten carbide powder and cobalt powder are mixed and grinded to obtain mixed powder; (2) the mixed powder and a multi-component binding agent consisting of paraffin-low molecular coupling agent-high molecular polymer are uniformly mixed to prepare a feedstock; (3) the feedstock is injected on an injection molding machine to form a molded blank; (4) the solvent degreasing and the thermal debinding are performed for the injection-molded blank in sequence; and (5) the ultrafine grain hard alloy step-shaped bar is obtained through sintering. The prepared ultrafine grain hard alloy step-shaped bar is small in alloy porosity and high in hardness and strength; and the diameter and size deviations are +-0.03 mm.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a step-shaped rod of ultra-fine-grained hard alloy with a large length-to-diameter ratio and a preparation method thereof. Background technique [0002] Ultra-fine-grained (WC grain size ≤ 0.5 μm) WC-Co cemented carbide has high strength, high hardness and high wear resistance, and is widely used in machining tools, molds and wear-resistant parts, including metal cutting tools, wire drawing and Stamping molds, sealing rings, nozzles and other fields. With the gradual maturity of ultra-fine-grained cemented carbide press-forming-sintering technology, problems such as many subsequent processing steps, high difficulty, and high cost have become increasingly prominent. [0003] For the manufacture of integral rotary cutting tools with large length-to-diameter ratio and complex shape and structure (such as cemented carbide drills, end mills, taps, etc.), due to ...

Claims

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Application Information

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IPC IPC(8): B22F3/22
Inventor 谢兴铖林晨光贾成厂曹瑞军
Owner GRIMAT ENG INST CO LTD
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