Consolidation of advanced WC-Co powders

被引：33

作者：

Parasiris, A ^{[1
]}

Hartwig, KT ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2000年 / 18卷 / 01期

关键词：

mechanical alloying; powder consolidation; extrusion; hardmetals; tungsten carbides;

D O I：

10.1016/S0263-4368(00)00005-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

WC Co powders were consolidated using a new method of extrusion. The consolidation process included two equal channel angular extrusions through a 90 degrees die at temperatures of 300 degrees C, 1100 degrees C or 1200 degrees C on composite billets containing different WC-Co powder blends. The composition investigated was WC-14%Co with particle sizes ranging from 0.2 to 0.8 mu m. The as-received powders and consolidated-annealed materials are characterized for structure, particle and grain size, impurity content, void fraction, composition and hardness. Full compaction is achieved after two extrusions at 1200 degrees C and subsequent annealing in argon at 1400 degrees C. The results compare favorably with results on commercially consolidated materials. The findings show that angular extrusion combined with post extrusion annealing can be used to successfully consolidate WC-Co powders into hard and strong cemented carbides of interest to the cutting tool and oil field industries. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：23 / 31

页数：9

共 22 条

[1]

AMBERG S, 1997, POWD MET, V1, P1

[2]

[Anonymous], ADV POWDER METALLURG

[3] Nanocrystalline materials: A study of WC-based hard metals [J].

Berger, S ;

Porat, R ;

Rosen, R .

PROGRESS IN MATERIALS SCIENCE, 1997, 42 (1-4) :311-320

[4] Full density processing of complex WC-based cemented carbides [J].

Bhaumik, SK ;

Upadhyaya, GS ;

Vaidya, ML .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 1996, 58 (01) :45-52

[5]

BRUHN J, 1999, METAL POWDER REPORT, V1, P30

[6] Methods for the characterization of grain size [J].

Ciupinski, L ;

Ralph, B ;

Kurzydlowski, KJ .

MATERIALS CHARACTERIZATION, 1997, 38 (03) :177-185

[7] The equal channel angular extrusion process for materials processing [J].

Cornwell, LR ;

Hartwig, KT ;

Goforth, RE ;

Semiatin, SL .

MATERIALS CHARACTERIZATION, 1996, 37 (05) :295-300

[8] Separate assessment of porosity and uncombined carbon in cemented carbides [J].

From, A ;

Sandstrom, R .

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 1996, 14 (5-6) :407-417

[9] AVERAGE GRAIN SIZE IN POLYCRYSTALLINE CERAMICS [J].

MENDELSON, MI .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1969, 52 (08) :443-+

[10] Synthesis of WC and WC-Co cermets by mechanical alloying and subsequent hot isostatic pressing [J].

Mi, S ;

Courtney, TH .

SCRIPTA MATERIALIA, 1997, 38 (01) :171-176

← 1 2 3 →