STUDY IN DURABILITY OF Cr2O3-BASED CERAMIC CUTTING TOOLS

Sep 4, 2026

Uploaded by Maeve

Research investigates the feasibility of using chromia (Cr2O3) as cutting-tool material, focusing on structural features and durability under different machining parameters. Cr2O3-based ceramic cutting inserts, including Cr2O3 with AlN additions after electroconsolidation, are compared against alumina-based inserts. Microstructure evaluation employs SEM and TEM. Durability tests use hardened NC11LV and non-hardened C45 steels, with a 0.4 mm notch wear criterion. Results show markedly higher wear resistance and longer cutting life for Cr2O3-AlN tools.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages6

Reading Time15 min

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Abstract

Introduction

Materials and methods

STUDY IN DURABILITY OF CR2O3-BASED CERAMIC CUTTING TOOLS Zbigniew Siemiatkowski1, Dmitrij Morozow1, Miroslaw Rucki1, 2, Mykola Prokopiv3, Volodymyr Nerubatskyi4, Ludmila Voloshina4, Edvin Hevorkian1, 4 1Kazimierz Pulaski University of Technology and Humanities in Radom, Poland; 2Vilnius Gediminas Technical University, Lithuania; 3V.Bakul Institute for Superhard Materials NAS, Ukraine; 4Ukrainian State University of Railway Transport, Ukraine [m.rucki@uthrad.pl](m.rucki@uthrad.pl) Abstract. The research was performed in the context of feasibility examinations ofchromia application as cutting tool materials. In the paper, a study on the Cr2O3 –based ceramic cutting tools is presented from the perspective of structural features and durability under various machining parameters. Comparative analysis was performed using alumina-based ceramic cutting inserts. Microstructure was examined using scanning and transmission electron microscopy (SEM and TEM), LEO1455 VP (ZEISS) and MIRA3 TESCAN, respectively. It was found that Cr2O3 –based ceramic with AlN additions after electroconsolidation exhibited more fine structure with evenly distributed AlN inclusions and small amount of spherical pores, below 2% . The cutting durability tests were performed with both hardened NC11LV and non-hardened C45 (1.0503) steels, using multiedge cutting inserts of dimensions 14.75 mm × 14.75 mm × 4.75 mm, made of respective ceramics. The machine tool Mazak QTE was used for the tests, and the wear criterion was 0.4 mm notch wear value, assessed with Keyence microscope. It was demonstrated that a pure alumina cutting tool exhibited 3 times larger wear than Cr2O3–AlN one after 25 minutes of work. On the other hand, Cr2O3–AlN cutting edge reached the same wear rate at 175 m·min-1 as Al2O3 –based tools at just 50 m·min-1. For the same cutting speed of 150 m·min-1, the chromia-based ceramic insert worked over 30 minutes, two times longer than alumina ones. The increased wear resistance and durability can be attributed to the finedispersed structure obtained not only by certain proportion of components, but also by the electroconsolidation technique with specific parameters. Keywords: sintering, electroconsolidation, ceramics, cutting tools, durability. Introduction Nowadays, in the context of the increasing quality demands, development of new cutting tools with improved performance is highly motivated. In industry, superhard materials are widely used for fabrication of cutting tools [1]. Among the hardest materials, cubic boron nitride (cBN) is known, which is inferior only to diamond [2] . However, cBN tools are brittle, easily chipped, not stable at higher temperatures, and thus, cannot withstand higher speeds, and they are expensive [3] . During the cutting process, both machining parameters and tools should be optimised due to the machining-induced physical effects that affect the surface integrity of the machined part [4] . Quality of the finished surface is crucial for its frictional properties [5-6] and is highly dependent on the machining conditions [7-8] . It is also known that high temperature and other severe conditions at the interface between the cutting edge and chip are the main reasons for wear and failures of ceramic tools [9] . Thus, due to continuous development of engineering materials and the increasing demand for machining motivates to continue research and especially to investigate new materials for cutting tools [10] . In the present study, a novel electroconsolidation technology was applied for sintering of Cr2O3 – based ceramic cutting tools. It is widely known that Cr2O3 is widely applied in industry, especially inform of coatings that provide protection against wear, both sliding and abrasive ones [11] . It was experimentally demonstrated that the friction couples chromia–steel exhibited the lowest seizure loads compared to the steel-steel and WC-steel ones, and the surface did not show significant sliding wear

FAQs

What is the main goal of the research on Cr2O3-based ceramic cutting tools?

To assess the feasibility of chromia (Cr2O3) as a cutting-tool material by studying structural features and durability under varying machining parameters.

How were the Cr2O3-AlN and alumina-based ceramic inserts prepared and examined?

Inserts were made by electroconsolidation using Cr2O3 powder with AlN (15% by mass) and compared with alumina tools; microstructures were analyzed with SEM and TEM.

What wear-performance differences were observed between Cr2O3-AlN and alumina tools?

Pure alumina showed about three times larger wear after 25 minutes, while Cr2O3-AlN reached similar wear rate to alumina at much higher cutting speed; at 150 m/min chromia-based inserts lasted over 30 minutes, about twice as long as alumina.

Sep 4, 2026

Uploaded by Maeve