A kind of WC-Ni3Al cemented carbide toughened by Zr element and preparation method thereof

Abstract

The invention discloses a WC-Ni3Al cemented carbide toughened by Zr element and a preparation method thereof. The hard phase is WC, and the binder phase is Ni3Al-Zr with a volume percentage of 10% to 40%. The preparation steps include: Pre-wet mill the ZrH2 powder with a mass percentage of 0.005% to 0.246% for 1 to 2 hours, and then add the remaining WC+Ni3Al pre-alloyed powder to wet mill together to obtain a wet mill mixture; after spray drying and compression molding Make a compact; first follow the conventional sintering curve, raise from normal temperature to 450°C, keep warm for 1 to 2 hours, pump to a limit vacuum below 4×10-3Pa, and then pass 20mbar to 60mbar between 450°C and 1200°C Low-pressure hydrogen, heating rate ≤ 5°C / min, after reaching the end temperature, vacuum again to below 4×10-3Pa, and keep warm for 1 to 2 hours to complete the low-pressure hydrogen treatment of the compact; then follow the conventional sintering curve, heat up The Zr-toughened WC-Ni3Al cemented carbide is obtained after low-pressure liquid-phase sintering at a sintering temperature of 1350°C to 1550°C, which has excellent toughness and flexural strength and is simple in process.

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...

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