Electrical discharge machinable (Y, Nd) co-stabilized zirconia – Niobium carbide ceramics
Electrical discharge machinable (Y, Nd) co-stabilized zirconia – Niobium carbide ceramics
复制标题
可放电加工(Y、Nd)共稳定氧化锆 – 碳化铌陶瓷
DOI:
10.1016/j.jeurceramsoc.2019.11.004
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发表时间:
2020
影响因子:
5.7
通讯作者:
Schweizer
中科院分区:
文献类型:
--
作者:
Gommeringer;Schweizer
Electrical discharge machining (EDM) of electrically conductive ceramics offers the possibility to manufacture customized ceramic components from sintered blanks. In this study two different yttria neodymia co-stabilized TZP materials containing 28 vol% niobium carbide were manufactured by hot pressing at 1275 °C–1400 °C and axial pressure of 60 MPa and compared to a 3Y-TZP based reference. The co-stabilized ceramics offer a strength up to 1250 MPa and a hardness of 14 GPa. The fracture resistance can be tailored between 7.4–9.7 MPa√m by variation of the yttria/neodymia ratio and the sintering temperature. These composites, however, require an exact setup of machining parameters. Die sinking EDM experiments revealed that the dominant material removal mechanism is melting. Machined surfaces can achieve low roughness Ra =0.3 μm combined with material removal rates of 1.5 mm³/min. The choice of excessively high energy parameters in EDM may lead to crack formation, spallation and phase accumulation during re-solidification.
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DOI:
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发表时间:
2010
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2007
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2017
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2011
期刊:
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作者:
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