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Competitive opportunities for powder metallurgy
nology, Vol 10, No 1, 1992, 18-24. (In
The role of MIM in t h e production of metal p a r t s in discussed. A description is given of the use of MIM of elongated a n d acicular Fe powders in a stearic acid/bee's wax binder. Various powder parameters, including particle size and shape, concentration of b i n d e r in t h e mixture, moulding temperature and temperature variation of binder viscosity were investigated. The production of defect free s p e c i m e n s w i t h a d e n s i t y of 50% was reported.
Chinese). A description, based on experimentation, of the rheological b e h a v i o u r of MIM feed stock, is given. Effects of variations in powder particle sizes a n d shapes, using a methyl cellulose binder, were studied. The viscosity/shear rate graph, plotted as logarithmic functions, is reported to be linear. The m e c h a n i c a l p r o p e r t i e s of some finished p a r t s are reported.
INJECTION MOULDING OF METAL AND CERAMIC POWDERS
Refractory metals
T. Aoba, Porima Daijesuto, Vol 43, No 4, 1991, 13-17. (In J a p a n e s e ) . The i n j e c t i o n m o u l d i n g p r o c e s s as applied to metals, magnetic materials a n d ceramics is reviewed with respect to t h e a d v a n t a g e s a n d d i s a d v a n t a g e s of t h e process a n d precautions t a k e n in practice. The key steps in the process, materials available, machinery a n d applications are considered. STUDY OF THE RHEOLOGY OF THE F E E D S T O C K FOR INJECTION MOULDING
L. Zhleng et al, (Central Iron a n d Steel
E F F E C T S OF BORON SATURATION OF REFRACTORY METALS
Y.V. Dzyadykecich et al, Poroshkovaya Metallurgiya, Vol 76,1991, 70-75. (In Russian). Factors influencing the s a t u r a t i o n of refractory metals with B were investigated with reference to t h e structural evolution of boride phases. The effects of activating additives (C a n d S) on the formation of boride coatings on refractory metal powders are reported. It is shown t h a t the s a t u r a t i o n can be e n h a n c e d by use of boride m i x t u r e s with a low B4C content.
PM components
WEAR RESISTANCE OF PM COMPONENTS IN TEXTILE MACHINES
A.I. Yuga et al. Poroshkovaya Metallurgiya, No 7, 1991, 92-96. (In Russian). Simulative wear tests on a PM friction c o m p o n e n t for a t e x t i l e m a c h i n e a r e described. It is reported t h a t a b r a s s / i r o n alloy showed properties superior to o t h e r friction materials.
Miscellaneous
COMPETITIVE OPPORTUNITIES FOR POWDER METALLURGY
WA. H u p p m a n n , (Hilti AG, Ffistentum, Liechenstein), Powder Metall Int, Vol 24, No 2, 1992, 122-124. (In G e r m a n ) . The fundamentals o f PM a n d i t s p o t e n t i a l for i n n o v a t i o n in t h e market, technology and resource sectors are surveyed. Strategies for the e x p a n s i o n of PM are suggested.
KOREATUNGSTEN • Tungsten Carbide Powder • Tungstic Oxide • Tungsten Metal Powder • Ammonium Paratungstate • General Trading including Non-ferrous Metals & Minerals
• Hardmetal Products • Tungsten Wire
Please contact the nearest office for more information! HEAD OFFICE DAEGU P.O. BOX 196, SEOUL, KOREA TEL: 053-763-9521 FAX: 053-762-1053
D0SSELDORF OFFICE NIEDERKASSELER LOHWEG 8 4000 DOSSELDORF 11 GERMANY TEL: 0211-596020/596029 TELEX: 8587869 KTMC D FAX: 0211-592501
SEOUL OFFICE (MARKETING & TRADING DEPT.) 10, 1-GA MYE©NG-DONG, JUNG-GU, SEOUL, KOREA TEL: 02-757-3425/6/7 TELEX: 23646 K©TUNG K FAX: 02-753-3649 NEW YORK OFFICE ONE PENN PLAZA SUITE 1626 NEW YORK, NY 10119 USA TEL: 212-581-9175 TELEX: 234491 NYTUNG UR FAX: 212-564-8319
TOKYO OFFICE 4 F, SAO PAULO BLDG 3-5-1 SHIMBASHI MINATO-KU, TOKYO JAPAN TEL: 03-3595-1697/8 FAX: 03-3504-3870
Research Inst., Beijing, China), PM Tech-
MPR July/August 1992 61
The role of MIM in t h e production of metal p a r t s in discussed. A description is given of the use of MIM of elongated a n d acicular Fe powders in a stearic acid/bee's wax binder. Various powder parameters, including particle size and shape, concentration of b i n d e r in t h e mixture, moulding temperature and temperature variation of binder viscosity were investigated. The production of defect free s p e c i m e n s w i t h a d e n s i t y of 50% was reported.
Chinese). A description, based on experimentation, of the rheological b e h a v i o u r of MIM feed stock, is given. Effects of variations in powder particle sizes a n d shapes, using a methyl cellulose binder, were studied. The viscosity/shear rate graph, plotted as logarithmic functions, is reported to be linear. The m e c h a n i c a l p r o p e r t i e s of some finished p a r t s are reported.
INJECTION MOULDING OF METAL AND CERAMIC POWDERS
Refractory metals
T. Aoba, Porima Daijesuto, Vol 43, No 4, 1991, 13-17. (In J a p a n e s e ) . The i n j e c t i o n m o u l d i n g p r o c e s s as applied to metals, magnetic materials a n d ceramics is reviewed with respect to t h e a d v a n t a g e s a n d d i s a d v a n t a g e s of t h e process a n d precautions t a k e n in practice. The key steps in the process, materials available, machinery a n d applications are considered. STUDY OF THE RHEOLOGY OF THE F E E D S T O C K FOR INJECTION MOULDING
L. Zhleng et al, (Central Iron a n d Steel
E F F E C T S OF BORON SATURATION OF REFRACTORY METALS
Y.V. Dzyadykecich et al, Poroshkovaya Metallurgiya, Vol 76,1991, 70-75. (In Russian). Factors influencing the s a t u r a t i o n of refractory metals with B were investigated with reference to t h e structural evolution of boride phases. The effects of activating additives (C a n d S) on the formation of boride coatings on refractory metal powders are reported. It is shown t h a t the s a t u r a t i o n can be e n h a n c e d by use of boride m i x t u r e s with a low B4C content.
PM components
WEAR RESISTANCE OF PM COMPONENTS IN TEXTILE MACHINES
A.I. Yuga et al. Poroshkovaya Metallurgiya, No 7, 1991, 92-96. (In Russian). Simulative wear tests on a PM friction c o m p o n e n t for a t e x t i l e m a c h i n e a r e described. It is reported t h a t a b r a s s / i r o n alloy showed properties superior to o t h e r friction materials.
Miscellaneous
COMPETITIVE OPPORTUNITIES FOR POWDER METALLURGY
WA. H u p p m a n n , (Hilti AG, Ffistentum, Liechenstein), Powder Metall Int, Vol 24, No 2, 1992, 122-124. (In G e r m a n ) . The fundamentals o f PM a n d i t s p o t e n t i a l for i n n o v a t i o n in t h e market, technology and resource sectors are surveyed. Strategies for the e x p a n s i o n of PM are suggested.
KOREATUNGSTEN • Tungsten Carbide Powder • Tungstic Oxide • Tungsten Metal Powder • Ammonium Paratungstate • General Trading including Non-ferrous Metals & Minerals
• Hardmetal Products • Tungsten Wire
Please contact the nearest office for more information! HEAD OFFICE DAEGU P.O. BOX 196, SEOUL, KOREA TEL: 053-763-9521 FAX: 053-762-1053
D0SSELDORF OFFICE NIEDERKASSELER LOHWEG 8 4000 DOSSELDORF 11 GERMANY TEL: 0211-596020/596029 TELEX: 8587869 KTMC D FAX: 0211-592501
SEOUL OFFICE (MARKETING & TRADING DEPT.) 10, 1-GA MYE©NG-DONG, JUNG-GU, SEOUL, KOREA TEL: 02-757-3425/6/7 TELEX: 23646 K©TUNG K FAX: 02-753-3649 NEW YORK OFFICE ONE PENN PLAZA SUITE 1626 NEW YORK, NY 10119 USA TEL: 212-581-9175 TELEX: 234491 NYTUNG UR FAX: 212-564-8319
TOKYO OFFICE 4 F, SAO PAULO BLDG 3-5-1 SHIMBASHI MINATO-KU, TOKYO JAPAN TEL: 03-3595-1697/8 FAX: 03-3504-3870
Research Inst., Beijing, China), PM Tech-
MPR July/August 1992 61