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Machining Performance of Hot-Pressed Carbon Nanotube Reinforced Alumina Cutting Tool Insert
Abstract Machining performance of monolithic alumina (Al2O3) tool inserts for metal cutting through carbon nanotube (CNT) incorporation was studied in this work. 0.3 vol% multiwalled CNT(MWCNT)-Al2O3 nanocomposite was prepared by hot-pressing at 1550°C with a dwell of 1 h under 2.5 MPa uniaxial pressure in static argon atmosphere. The hot-pressed nanocomposite achieved >99.5% of its theoretical density. The specimen also offered improved fracture toughness, KIC (~23% higher), flexural strength, σFS (~10% higher), hardness, HV1 (~7.5% higher) and thermal conductivity, κ (~30% higher) compared to those of pure Al2O3 (KIC = 5.23 MPa-m0.5, σFS = 341.01 MPa, HV1 = 18.80 GPa, κ = 23.69 W/mK). Inserts developed with this nanocomposite having 0.8 and 1 mm nose radii demonstrated successful machining during turning of AISI 4340 steel rod (hardness = 38 HRC) in dry environment under different cutting conditions and showed promising applicability in machining industry.
Machining Performance of Hot-Pressed Carbon Nanotube Reinforced Alumina Cutting Tool Insert
Abstract Machining performance of monolithic alumina (Al2O3) tool inserts for metal cutting through carbon nanotube (CNT) incorporation was studied in this work. 0.3 vol% multiwalled CNT(MWCNT)-Al2O3 nanocomposite was prepared by hot-pressing at 1550°C with a dwell of 1 h under 2.5 MPa uniaxial pressure in static argon atmosphere. The hot-pressed nanocomposite achieved >99.5% of its theoretical density. The specimen also offered improved fracture toughness, KIC (~23% higher), flexural strength, σFS (~10% higher), hardness, HV1 (~7.5% higher) and thermal conductivity, κ (~30% higher) compared to those of pure Al2O3 (KIC = 5.23 MPa-m0.5, σFS = 341.01 MPa, HV1 = 18.80 GPa, κ = 23.69 W/mK). Inserts developed with this nanocomposite having 0.8 and 1 mm nose radii demonstrated successful machining during turning of AISI 4340 steel rod (hardness = 38 HRC) in dry environment under different cutting conditions and showed promising applicability in machining industry.
Machining Performance of Hot-Pressed Carbon Nanotube Reinforced Alumina Cutting Tool Insert
Sarkar, Snehashis (author) / Das, Santanu (author) / Sarkar, Soumya (author) / Das, Probal Kumar (author)
Journal of The Institution of Engineers (India): Series C ; 99 ; 693-699
2017-06-29
7 pages
Article (Journal)
Electronic Resource
English
Machining Performance of Hot-Pressed Carbon Nanotube Reinforced Alumina Cutting Tool Insert
| Online Contents | 2018