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Nitriding sintering technology for YT15 hard alloy

A cemented carbide and nitriding technology, applied in the field of YT15 cemented carbide nitriding and sintering process, can solve problems such as poor strength and achieve the effect of improving various properties

Inactive Publication Date: 2011-04-13
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] YT15 is a general-purpose alloy grade with good red hardness and wear resistance, but poor strength

Method used

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  • Nitriding sintering technology for YT15 hard alloy
  • Nitriding sintering technology for YT15 hard alloy
  • Nitriding sintering technology for YT15 hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Material selection, choose the grade YT15 cemented carbide sample prepared by powder metallurgy process, and the particle size and carbon content of the powder used in the YT15 cemented carbide sample are as follows:

[0025] Materials

WC

(W,Ti)C

co

FSSS / μm

2.0

2.36

1.18

C Content / wt%

5.96

9.80

0.0110

[0026] (2) Degumming, put the YT15 cemented carbide sample selected in step (1) into the vacuum degreasing and sintering integrated furnace, use a mechanical pump to vacuum the furnace to an absolute pressure of 100Pa, turn on the chip vacuum pump and continue to vacuum to absolute The pressure is below 10Pa, then the temperature is raised to 245°C for 120 minutes, the heating rate is 10°C / min, and finally the temperature is raised to 350°C for 240 minutes, the heating rate is 8°C / min, and the degumming is completed;

[0027] (3) Nitriding and sintering. After the degumming is completed, the vacuum degreasi...

Embodiment 2

[0032] (1) Material selection, choose the grade YT15 cemented carbide sample prepared by powder metallurgy process, and the particle size and carbon content of the powder used in the YT15 cemented carbide sample are as follows:

[0033] Materials

WC

(W,Ti)C

co

FSSS / μm

2.0

2.36

1.18

C Content / wt%

5.96

9.80

0.0110

[0034](2) Degumming, put the YT15 cemented carbide sample selected in step (1) into the vacuum degreasing and sintering integrated furnace, use a mechanical pump to vacuum the furnace to an absolute pressure of 100Pa, turn on the chip vacuum pump and continue to vacuum to absolute The pressure is below 10Pa, then the temperature is raised to 250°C and kept for 150 minutes, the heating rate is 20°C / minute, and finally the temperature is raised to 370°C and kept for 600 minutes, the heating rate is 14°C / minute, and the degumming is completed;

[0035] (3) Nitriding and sintering. After the degumming is comple...

Embodiment 3

[0040] (1) Material selection, choose the grade YT15 cemented carbide sample prepared by powder metallurgy process, and the particle size and carbon content of the powder used in the YT15 cemented carbide sample are as follows:

[0041] Materials

WC

(W,Ti)C

co

FSSS / μm

2.0

2.36

1.18

C Content / wt%

5.96

9.80

0.0110

[0042] (2) Degumming, put the YT15 cemented carbide sample selected in step (1) into the vacuum degreasing and sintering integrated furnace, use a mechanical pump to vacuum the furnace to an absolute pressure of 100Pa, turn on the chip vacuum pump and continue to vacuum to absolute The pressure is below 10Pa, then the temperature is raised to 255°C for 180 minutes, the heating rate is 30°C / min, and finally the temperature is raised to 390°C for 900 minutes, the heating rate is 20°C / min, and the degumming is completed;

[0043] (3) Nitriding and sintering. After the degumming is completed, the vacuum degreas...

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Abstract

The invention discloses a nitriding sintering technology for a YT15 hard alloy, which is characterized by comprising the following steps of: selecting material, namely a hard alloy sample marked with YT15 and prepared by a powder metallurgy technology; degumming,namely placing the selected YT15 hard alloy sample in a vacuum debinding sintering integrated furnace for degumming, then, vacuumizing the vacuum debinding sintering integrated furnace to absolute pressure of 10Pa after the completion of the degumming, and introducing high-purity nitrogen, wherein purity of the nitrogen is not less than 99.99%, heating the vacuum debinding sintering integrated furnace up to 1450+ / -5 DEG C, and preserving heat for 80-100 minutes at the temperature range of 1450+ / -5 DEG C, then preserving heat for 150-210 minutes at a temperature range of 1200+ / -5 DEG C, and taking out the alloy after being cooled to room temperature with the furnace; in the technology, parameters are rationally selected for the nitriding sintering treatment on the YT15 hard alloy, and all properties of the YT15 hard alloy are improved.

Description

technical field [0001] The invention relates to a nitriding and sintering process of YT15 hard alloy. Background technique [0002] The performance of materials is affected by the bulk and surface properties of materials, and the bulk and surface properties of materials are affected by the chemical composition and microstructure of materials. In practical applications, the microstructure of the material, especially the microstructure of the surface, has a more important and direct impact on its performance. Nitriding sintering can change the microstructure of Ti-containing cemented carbide surface. Hashe N. G et al. studied the nitriding and sintering of WC-VC-Co alloys (Hashe N. G, Norgren S, Andrén H. –O, Neethling J. H, Berndt P. R. Int J Refract Met Hard Mat [J], 2009, 27(1): 20) and WC-VC-TiC-Co alloys (Hashe N. G, Neethling J. H, Andrén H. –O, Norgren S, Berndt P. R. Int J Refract Met Hard Mat [J], 2008, 26(5): 404) the influence of surface microstructure, the resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/04
Inventor 蒋显全陈巧旺钟秋鑫姜爱民
Owner CHONGQING ACADEMY OF SCI & TECH