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Zr element-toughened WC-Ni3Al hard alloy and preparation method thereof

A technology of cemented carbide and its manufacturing method, which is applied in the field of cemented carbide materials and its preparation, and can solve problems such as performance degradation and poor toughening effect

Active Publication Date: 2013-12-11
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, Zr is also easy to react with the residual oxygen in the compact to form oxides, which will easily cause performance degradation and poor toughening effect

Method used

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  • Zr element-toughened WC-Ni3Al hard alloy and preparation method thereof
  • Zr element-toughened WC-Ni3Al hard alloy and preparation method thereof
  • Zr element-toughened WC-Ni3Al hard alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: be 0.005% ZrH by mass percent 2 After the powder is pre-wet milled for 1 hour, the remaining WC+Ni 3 Al pre-alloyed powder (Ni 3 The mass percentage of Al in the pre-alloyed powder is 5.04%) and wet grinding together to obtain a wet grinding mixture; the wet grinding mixture is spray-dried and pressed to form a green compact; The speed is raised from normal temperature to 450°C, kept for 1 hour, and pumped to the ultimate vacuum of 4×10 -3 Below Pa, then continue to heat up to 650°C, start from the initial temperature of 650°C, feed 20mbar low-pressure hydrogen, and increase the temperature at a rate of 1°C / min to the end temperature of 1000°C, and then evacuate again to 4×10 -3 Pa and keep it warm for 1 hour to complete the low-pressure hydrogen treatment of the compact; then follow the conventional sintering curve, heat up to the sintering temperature of 1550°C, and obtain Zr-toughened WC-Ni after low-pressure liquid phase sintering 3 Al cemented carb...

Embodiment 2

[0026] Embodiment 2: the ZrH that mass percent is 0.026% 2 After the powder is pre-wet milled for 1.5 hours, the remaining WC+Ni 3 Al pre-alloyed powder (Ni 3 The mass percentage of Al in the pre-alloyed powder is 5.04%) added together for wet grinding to obtain a wet-milled mixture; the wet-milled mixture is spray-dried and pressed to form a green compact; The speed is raised from normal temperature to 450°C, kept for 1.5 hours, and pumped to the ultimate vacuum of 4×10 -3 Below Pa, then continue to heat up to 550°C, start from the initial temperature of 550°C, feed 40mbar low-pressure hydrogen, and increase the temperature at a rate of 3°C / min to the end temperature of 1100°C, and then evacuate again to 4×10 -3 Pa and keep it warm for 1.5 hours to complete the low-pressure hydrogen treatment of the compact; then follow the conventional sintering curve, heat up to the sintering temperature of 1550°C, and obtain Zr-toughened WC-Ni after low-pressure liquid phase sintering 3...

Embodiment 3

[0027] Embodiment 3: the ZrH that mass percent is 0.051% 2 After the powder is pre-wet milled for 2 hours, the remaining WC+Ni 3 Al pre-alloyed powder (Ni 3 The mass percentage of Al in the pre-alloyed powder is 5.04%) added together for wet grinding to obtain a wet-milled mixture; the wet-milled mixture is spray-dried and pressed to form a green compact; The speed is raised from normal temperature to 450°C, kept for 2 hours, and pumped to the ultimate vacuum of 4×10 -3 Below Pa, start from the initial temperature of 450°C, pass in 60mbar low-pressure hydrogen, and raise the temperature to the end temperature of 1200°C at a rate of 5°C / min, and then evacuate again to 4×10 -3 Pa and keep it warm for 2 hours to complete the low-pressure hydrogen treatment of the compact; then follow the conventional sintering curve, heat up to the sintering temperature of 1550°C, and obtain Zr-toughened WC-Ni after low-pressure liquid phase sintering 3 Al cemented carbide, where the binder ph...

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Abstract

The invention discloses a Zr element-toughened WC-Ni3Al hard alloy and a preparation method thereof. A hard phase is WC, and a binding phase is 10-40% of Ni3Al-Zr by volume. The preparation method comprises the following steps: performing pre-wet grinding on 0.005-0.246% of ZrH2 powder by mass for 1-2 hours, then adding the remaining WC and Ni3Al pre-alloyed powder, and performing wet grinding together to obtain a wet-grinding mixture; performing spray drying and compression moulding to obtain a compact; heating from normal temperature to 450 DEG C according to a conventional sintering curve, preserving heat for 1-2 hours, and exhausting to ultimate vacuum below 4*10<-3>Pa; introducing low-pressure hydrogen at 20-60mbar at a temperature of 450-1,200 DEG C, and heating at a speed of less than or equal to 5 DEG C per minute; after heating to the end temperature, vacuumizing again to below 4*10<-3>Pa, and preserving heat for 1-2 hours to finish the low-pressure hydrogen treatment on the compact; and heating to a sintering temperature of 1,350-1,550 DEG C according to the conventional sintering curve, and performing low-pressure liquid-phase sintering to obtain the Zr-toughened WC-Ni3Al hard alloy, wherein the toughness and bending resistance of the alloy are excellent, and the technology is simple and convenient.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a Ni alloy with WC as the hard phase and Zr toughened by powder metallurgy technology. 3 Cemented carbide with Al as binder phase and its preparation method. Background technique [0002] Cemented carbide is widely used as cutting tools, mining tools and wear-resistant parts due to its high strength, high hardness, high wear resistance and high red hardness. The existing cemented carbide materials are mainly composed of matrix WC and binder phase Co metal. Due to the good wettability of Co to WC, the comprehensive mechanical properties at room temperature are good, but Co is a strategic resource, the price is relatively expensive, and it is prone to softening, oxidation, and high-temperature corrosion under high temperature conditions. Under high temperature conditions, it is easy to wear and fail. Therefore, the application of cemented carbide wi...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 张忠健龙坚战
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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