Cubic boron nitride based composites for cutting applications

• Autorzy: Klimczyk P. , Figiel P. , Petrusha I , Olszyna A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of our work was to obtain durable fined-grained cBN-Si₃N₄ composite with high values of hardness and fracture toughness, which can be successfully used as a cutting tool. Little quantity of the Si₃N₄ nanopowder fills up the porous between cBN grains thus result in resistance to crack propagation by means so called “crack deflection” mechanism. Design/methodology/approach: Two variants of the cBN-Si₃N₄ composites („I” - with micropowder cBN and „II” - with mixture of micro- and nanopowdes cBN) contained 3% of nanodispersed Si₃N₄ powder, have been sintered at High Pressure - High Temperature (HPHT) conditions. Basic physical-mechanical properties, phase composition and microstructure of sintered materials have been investigated. Findings: The comparison of the mechanical properties of cBN-Si₃N₄ (I) and cBN-₃N₄ (II) composites showed that the addition of 10% cBN nanopowder to mixture caused small increase in hardness from 4750 up to 4855 HV₁₀ and decrease in Young’s modulus from 842 to 812 GPa. Fracture toughness of both type of composites is on the same level above 10 MPa-m^1/2. Research limitations/implications High hardness of cBN-Si₃N₄ composites present a technical challenge in shaping of them. Commercial application of presented materials, e.g. cutting tools production, needs to develop a high efficient cutting, lapping and grinding techniques. Practical implications: The material obtained could be successfully applied for different cutting applications due to its favourable combination of hardness and fracture toughness. Originality/value: Commercial superhard materials, so called “high content cBN composites”, have usually 10-20 vol% of binding phase, often in the form of Ti or/and Al compounds. In the presented work only 3% of Si₃N₄ phase was used as a sintering aid. The high content of cBN phase allows to keep Young’s modulus and hardness values close to the theoretical ones for pure PcBN.

Słowa kluczowe

EN

tool materials; cBN composites; HPHT

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 44, nr 2
• Strony: 198--204
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Klimczyk P.

• The Institute of Advanced Manufacturing Technology, ul. Wrocławska 37a, 30-011 Kraków, Poland

autor

Figiel P.

• The Institute of Advanced Manufacturing Technology, ul. Wrocławska 37a, 30-011 Kraków, Poland

autor

Petrusha I

• V. Bakul Institute for Superhard Materials NASU, Avtozavodskaya 2 St, 04074 Kiev, Ukraine

autor

Olszyna A.

• Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Wołoska 141, 02-507 Warszawa, Poland

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