Core/rim microstructure of Ti(C, N) cermets with low nickel-molybdenum binder content-Reference-Cited by-同舟云学术

Core/rim microstructure of Ti(C, N) cermets with low nickel-molybdenum binder content

Published:2023-06-06 Issue:2 Volume:17 Page:46-52
ISSN:2412-8767
Container-title:Powder Metallurgy аnd Functional Coatings
language:
Short-container-title:Izv. VUZ. Poroshk. Met.

Author:

Grigorov I. G.¹^ORCID,Zhilyaev V. A.¹^ORCID

Affiliation:

1. Institute of solid state chemistry, Ural branch of the Russian Academy of Sciences

Abstract

We investigated the influence of the basic component concentration on the microstructure of the KNT3 and KNT3 tungsten-free hard alloys (TFHA), focusing on ceramic-metal samples (cermets) with a low nickel-molybdenum binder content. The microstructure of the sintered cermets was analyzed using reflected electron images of thin sections obtained with a scanning electron microscope. Our analusis revealed that the KNT alloy exhobits a core/rim structure (CRM). We observed that decreasing the Ni–Mo binder content leads to a significantincrease in the rim size isurrounding the Ti(C, N) core in the sintered alloy. We also investigated the effect of the plasticizer on the formation of the core/rim microstructure with a low binder content. Furthermore, we found that the absence of nitrogen-enriched areas in the Ti(C, N) grains increases the molybdenum diffusion rate across the refractory phase interfaces during the cooling stage, resulting in a higher specific volume fraction of the shell in the cermet microstructure.

Publisher

National University of Science and Technology MISiS

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