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Published in:
2005 | OriginalPaper | Chapter
β-SI3N4 Cutting Tools Obtaining for Machining of the Gray Cast Iron
Authors : J. V. C. Souza, C. A. Kelly, M. R. V. Moreira, M. V. Ribeiro, M. A. Lanna, O. M. M. Silva
Published in: AMST’05 Advanced Manufacturing Systems and Technology
Publisher: Springer Vienna
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Recentely, Si
3
N
4
has been used as cutting tools in several alloys machining. Such materials shows SiAlONs and β-Si
3
N
4
, that it has excellent thermomachanical properties. This work had as objetive to develop and to apply β-Si
3
N
4
cutting tools in machining of gray cast iron, starting from a mixture composed by 78.30 wt % α-Si
3
N
4
, 1.00 wt % A1
2
O
3
, 14.40 wt % A1N, 3.15 wt % CeO
2
and 3.15 wt % Y
2
O
3
, that was pressed and sintered at 1900°C. After characterization, cutting tools showed, HV = 20.50 GPa, K
IC
= 6.45 MPa.m
1/2
, with 95 % β-Si
3
N
4
phase. Then, it were submited to machining of gray cast iron using: 1
a
step - Vc=180, 240, 300 and 360 m/min, f = 0.12mm/rot and ap = 1.00 mm; and 2
a
step — Vc = 300m/min, f = 0.23, 0.33 and 0.40 mm/rot and ap = 1.00 mm. For 7500 m cutting length, results showed excellent performace.