A streamlined life cycle assessment on the fabrication of WC–Co cermets

Abstract Tungsten carbide–cobalt (WC–Co) cermets have been widely used because of their high hardness and excellent wear-resistant properties. In this study, the environmental burdens related to WC–Co component fabrication were evaluated to compare the Laser Engineered Net Shaping (LENS ® ) process and the conventional powder metallurgy (P/M) process. Sensitivity analysis revealed that choice of weighting scheme does not significantly affect the final result; the LENS ® process is more preferable if powder recycling is applied, part size is small, or part shape is complex; and the P/M process provides more benefits to produce large parts of simple shape.

[1]  Thomas L. Saaty,et al.  Multicriteria Decision Making: The Analytic Hierarchy Process: Planning, Priority Setting, Resource Allocation , 1990 .

[2]  Theodore J. Reinhart,et al.  Engineered materials handbook , 1987 .

[3]  John L. Sullivan,et al.  Weighting in Life Cycle assessments in a global context , 2002 .

[4]  L. E. Mccandlish,et al.  Production capability and powder processing methods for nanostructured WC-Co powder , 1997 .

[5]  Bert Bras,et al.  Environmentally benign manufacturing – A workshop report , 2006 .

[6]  G. Ji,et al.  Nanostructured WC?Co alloy prepared by mechanical alloying , 1996 .

[7]  B. Kear,et al.  Chemical processing and properties of nanostructured WC-Co materials , 1993 .

[8]  G. Huppes,et al.  A Framework for Quantified Eco‐efficiency Analysis , 2005 .

[9]  B. Kear,et al.  Processing and properties of nanostructured WC-Co , 1992 .

[10]  D. L. Greene,et al.  Laser Engineered Net Shaping (LENS(TM)): A Tool for Direct Fabrication of Metal Parts , 1998 .

[11]  G. S. Upadhyaya,et al.  Full density processing of complex WC-based cemented carbides , 1996 .

[12]  M. L. Griffith,et al.  Understanding the Microstructure and Properties of Components Fabricated by Laser Engineered Net Shaping (LENS) , 2000 .

[13]  K Puttick,et al.  Handbook of Ceramic Grinding and Polishing , 2000 .

[14]  T. Xiao,et al.  Deposition and characterization of nanostructured WC–Co coating , 2001 .

[15]  V. Sobolev,et al.  Dynamic processes during high velocity oxyfuel spraying , 1996 .

[16]  A. Griffo,et al.  An experimental study of the sintering of nanocrystalline WC-Co powders , 2005 .

[17]  M. L. Griffith,et al.  Solidification in direct metal deposition by LENS processing , 2001 .

[18]  G. Norris.  The requirement for congruence in normalization , 2001 .

[19]  D W Pennington,et al.  Life cycle assessment: Part 1: Framework, goal and scope definition, inventory analysis, and applications , 2004 .

[20]  K. Hartwig,et al.  Consolidation of advanced WC–Co powders , 2000 .

[21]  Julie M Schoenung,et al.  An integrated impact assessment and weighting methodology: evaluation of the environmental consequences of computer display technology substitution. , 2007, Journal of environmental management.

[22]  Bi Zhang,et al.  Grinding of nanostructured ceramic coatings: surface observations and material removal mechanisms , 2002 .

[23]  Frank Remsen Field.  Application of multi-attribute utility analysis to problems in materials selection , 1985 .