Ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and preparation method

A technology of steel-bonded hard alloy and ultra-high strength, which is applied in the field of cobalt-containing and coatable TiCN-based steel-bonded hard alloy. Substrate high temperature resistance and other issues, to achieve the effect of improving sintering activity, improving tempering resistance, and increasing transition temperature

Active Publication Date: 2018-08-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tempering resistance of traditional steel-bonded cemented carbide is insufficient, and its strength is generally lower than 1400MPa, so its application range is limited to low-end molds or wear-resistant parts, and generally cannot meet the requirements of tool materials.
The main reasons include: high impurity content, low density, poor matrix high temperature resistance and poor wettability of hard phase and matrix metal

Method used

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  • Ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and preparation method
  • Ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and preparation method
  • Ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Present embodiment takes following technical scheme:

[0033] (1) 27wt.% titanium carbonitride powder, 0.90wt.% carbon powder, 2.0wt.% chromium carbide powder, 2.5wt.% molybdenum carbide powder, 2.0wt.% cobalt powder, 65.57wt .% iron powder and 5% of the total mass of paraffin were added to the stainless steel ball mill tank with a ball-to-material ratio of 5:1 and 100ml of absolute ethanol was added for wet milling and mixing. The speed of the ball mill was set at 250r / min, and the ball milling time was 72h;

[0034] (2) The powder obtained in step (1) is quickly dried in a vacuum drying oven by means of negative pressure drying, the drying temperature is 85 ° C, and the drying time is 4 hours, and then pre-conditioned for a certain time and temperature in a low oxygen partial pressure drying oven. Oxidation, passing through a 40-mesh sieve to sieve and granulate to obtain a mixed powder;

[0035] (3) Press the mixed powder of step (2) on a hydraulic press, the pressu...

Embodiment 2

[0040] (1) 30wt.% titanium carbonitride powder, 0.98%wt.% carbon powder, 3wt.% chromium carbide powder, 3wt.% molybdenum carbide powder, 5.0wt.% cobalt powder, 58.02wt. The remaining iron powder and 5% of the total mass of paraffin were added to the stainless steel ball mill tank, the ball to material ratio was 6:1, and 100ml of absolute ethanol was added for wet milling and mixing. The speed of the ball mill was set at 300r / min, and the ball milling time was 80h ;

[0041] (2) The powder obtained in step (1) is quickly dried in a vacuum drying oven by means of negative pressure drying, the drying temperature is 85 ° C, and the drying time is 4.5 hours, and then it is dried for a certain time and temperature in a low oxygen partial pressure drying oven. Preoxidation, passing through a 40-mesh sieve and granulating to obtain mixed powder;

[0042] (3) Press the mixed powder of step (2) on a hydraulic press, the pressure is 150Mpa, the pressure is increased slowly, and the pres...

Embodiment 3

[0047] (1) 32wt.% titanium carbonitride powder, 1.1%wt.% carbon powder, 2.8wt.% chromium carbide powder, 3.5wt.% molybdenum carbide powder, 7.0wt.% cobalt powder, 53.6 The balance of wt.% iron powder and 5% of the total mass of paraffin were added to the stainless steel ball mill tank, the ratio of ball to material was 5:1, and 100ml of absolute ethanol was added for wet grinding and mixing. The speed of the ball mill was set at 280r / min, and the ball mill Time 96h;

[0048] (2) The powder obtained in step (1) is quickly dried in a vacuum drying oven by means of negative pressure drying, the drying temperature is 80 ° C, and the drying time is 4 hours, and then pre-conditioned for a certain time and temperature in a low oxygen partial pressure drying oven. Oxidation, passing through a 40-mesh sieve to sieve and granulate to obtain a mixed powder;

[0049] (3) Press the mixed powder of step (2) on a hydraulic press, the pressure is 100Mpa, the pressure is increased slowly, and...

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Abstract

The invention relates to an ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and a preparation method. The preparation method is characterized by comprising the following steps that the ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool takes Co-containing Fe-Mo-Cr alloy steel as a matrix, and TiCN with the mass fraction of 20-35% is added as a hard phase; the surface of powder is activated by adopting the method that quantitative preoxidation oxygen aeration is carried out after high-energy ball milling, the sintering activity of the matrix is improved, then the oxygen content (less than 800 ppm) is reduced substantially by a carbon and oxygen reduction reaction in the sintering process, and the sintering temperature is reduced; and the tempering resistance, the PVD coating property, the strength and the toughness of the ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool are improved by leading in a strengthening element of Co. The ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool has high strength (2800-4000 MPa) and high toughness (alpha k is equal to 7-15 J/cm2, KIC is equal to 20-28 MPa.m1/2), the limitation that a traditional steel-bonded hard alloy is only used for mid-and-low-end wear-resistant pieces can be broken through, and threading tools such as a PVD coating and squeezing screw tap and a cutting screw tap which are more wear-resistant than high-speed steel and are more edge-breaking-resistant than hard alloy are prepared.

Description

technical field [0001] The invention belongs to the field of tool and die materials, and specifically provides a cobalt-containing and coatable TiCN-based steel-bonded hard alloy with ultra-high strength and high impact toughness. The material has great performance advantages and application potential in the field of thread tools and PVD-coated thread tools and other cutting tools. Background technique [0002] Threaded tools have high requirements on the wear resistance, toughness and strength of the tool material. For example, extrusion taps are a new type of thread tool that uses the principle of metal plastic deformation to process internal threads. Domestic high-end extrusion taps are completely dependent on imports. Compared with cutting taps and other cutting tools, they have high thread strength and tools are not easy to wear. And long life and other advantages. Imported extrusion taps are mainly made of powder metallurgy high-speed steel materials, such as PM30, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C33/02C22C30/00C22C38/10
CPCC22C1/05C22C30/00C22C33/006C22C33/02C22C38/10
Inventor 张乾坤李苏望肖逸锋罗水金陈永俊陈豫章
Owner XIANGTAN UNIV
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