Metal micropowders based on tungsten and/or molybdenum and 3D transition metals
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22F-003/00
B22F-001/00
출원번호
US-0581640
(2000-09-13)
우선권정보
FR-0013032 (1998-10-16)
국제출원번호
PCT/FR99/02518
(1999-10-15)
국제공개번호
WO00/23630
(2000-04-27)
발명자
/ 주소
Bonneau, Maxime
Lartigue, Jean-Francois
Maniak, Jean
출원인 / 주소
Eurotungstene Poudres
대리인 / 주소
Nixon & Vanderhye, P.C.
인용정보
피인용 횟수 :
4인용 특허 :
9
초록▼
The invention concerns a pre-alloyed metal powder consisting essentially of tungsten and/or molybdenum, at least one transition metal selected among iron, cobalt, nickel and copper, and optionally at least one additive, the iron content being less than 50 wt. % and the total additive content being l
The invention concerns a pre-alloyed metal powder consisting essentially of tungsten and/or molybdenum, at least one transition metal selected among iron, cobalt, nickel and copper, and optionally at least one additive, the iron content being less than 50 wt. % and the total additive content being less than 3 wt. %, relative to the total weight of metals, said pre-alloyed metal powder having elementary grain size measured with scanning electron microscope, greater than 200 nm and less than 5 micrometers. The invention also concerns a sintered part obtained with such a powder. The invention is particularly applicable for producing sintered parts to be used as electric contacts, heat sinks, spark machining electrodes, mechanical balance weights, inertial units, tool-holders, anti-radiation screen, armament components, sintered steel or diamond charged cutting or grinding tools or with titanium carbide.
대표청구항▼
The invention concerns a pre-alloyed metal powder consisting essentially of tungsten and/or molybdenum, at least one transition metal selected among iron, cobalt, nickel and copper, and optionally at least one additive, the iron content being less than 50 wt. % and the total additive content being l
The invention concerns a pre-alloyed metal powder consisting essentially of tungsten and/or molybdenum, at least one transition metal selected among iron, cobalt, nickel and copper, and optionally at least one additive, the iron content being less than 50 wt. % and the total additive content being less than 3 wt. %, relative to the total weight of metals, said pre-alloyed metal powder having elementary grain size measured with scanning electron microscope, greater than 200 nm and less than 5 micrometers. The invention also concerns a sintered part obtained with such a powder. The invention is particularly applicable for producing sintered parts to be used as electric contacts, heat sinks, spark machining electrodes, mechanical balance weights, inertial units, tool-holders, anti-radiation screen, armament components, sintered steel or diamond charged cutting or grinding tools or with titanium carbide. ontaining compound. 16. The composition of claim 15 where the at least one additional nitrogen containing compound is an ammonium salt. 17. The composition of claim 16 where the ammonium salt is selected from the group consisting of ammonium sulfate, ammonium chloride, ammonium monophosphate, ammonium diphosphate, ammonium citrate, ammonium nitrate, calcium ammonium phosphate, and mixtures thereof. 18. The composition according to claim 12 further comprising at least one additional non-nitrogen plant nutrient. 19. The composition of claim 18 where the non-nitrogen-containing plant nutrient is selected from the group consisting of phosphorous, potassium, iron, copper, zinc, manganese, boron, magnesium, molybdenum, sulfur, and mixtures thereof. 20. The composition of claim 12 further comprising a hardening agent in the urea shell. 21. The composition of claim 20 where the hardening agent is formaldehyde. 22. The composition according to claim 14 where the composition further comprises at least one additional nitrogen containing compound and at least one additional non-nitrogen plant nutrient. 23. The composition of claim 22 where the at least one additional nitrogen containing compound is selected from the group consisting of ammonium sulfate, ammonium chloride, ammonium monophosphate, ammonium diphosphate, ammonium citrate, ammonium nitrate, calcium ammonium phosphate, and mixtures thereof and the at least one additional non-nitrogen plant nutrient is selected from the group consisting of phosphorous, potassium, iron, copper, zinc, manganese, boron, magnesium, molybdenum, sulfur, and mixtures thereof. 24. A method for making a heterogeneous granular composition, comprising: providing a calcium cyanamide particle; and coating the calcium cyanamide particle with urea. 25. The method according to claim 24 where the calcium cyanamide particle is from about 0.1 to 40 percent by weight of the final heterogeneous granular composition. 26. The method according to claim 25 where the calcium cyanamide particle is from about 0.1 to about 10 percent by weight of the final heterogeneous granular composition. 27. The method according to claim 24 where urea is molten. 28. The method according to claim 27 where the molten urea is sprayed onto the calcium cyanamide particle. 29. The method according to claim 27 where the molten urea spray further comprises from about 0.01% to about 10% water. 30. The method according to claim 27 where the calcium cyanamide particle is coated with successive layers. 31. The method according to claim 30 where the successive layers are all urea layers. 32. The method according to claim 30 where at least one of the successive layers comprise materials selected from the group consisting of urea, ammonium sulfate, ammonium citrate, ammonium phosphate, calcium ammonium nitrate, calcium nitrate, sodium nitrate, ammonium chloride, and mixtures thereof. 33. An aqueous composition comprising greater than about 40 parts of water and about 10 parts of calcium cyanamide and urea combined, where the about 10 parts of calcium cyanamide and urea combined further comprises from about 0.1 to about 3 parts calcium cyanamide and from about 7 to about 9.9 parts urea. 34. The composition of claim 33 where aeration of the composition is inhibited. 35. The aqueous composition of claim 33 where it is a slurry. 36. The aqueous composition of claim 33 where it is a solution. dlish et al.; US-5258224, 19931100, Langlois, Jr. et al.; US-5332701, 19940700, Bryson et al.; US-5350719, 19940900, Narula et al.; US-5431967, 19950700, Manthiram et al.; US-5449646, 19950900, Zank; US-5632941, 19970500, Mehrotra et al.; US-5880382, 19990300, Fang et al., 075/236
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이 특허에 인용된 특허 (9)
Yu Chunzhe C. ; Kumar Reshma, Chemical synthesis of refractory metal based composite powders.
Johnson Walter A. (Towanda PA) Kopatz Nelson E. (Sayre PA) Ritsko Joseph E. (Towanda PA), Hydrometallurgical process for producing spherical maraging steel powders utilizing spherical powder and elemental oxidi.
Houck David L. (Towanda PA) Kopatz Nelson (Sayre PA) Paliwal Muktesh (Owego NY) Sampath Sanjay (Coram NY), Method of making flowable tungsten/copper composite powder.
Wahlberg Sverker (Hagersten SEX) Muhammed Mamoun (Djursholm SEX) Grenthe Ingmar (Osterskar SEX), Method of preparing powders for hard materials from APT and soluble cobalt salts.
Grenthe Ingmar (Osterskar SEX) Muhammed Mamoun (Djursholm SEX) Wahlberg Sverker (Hagersten SEX), Method of preparing powders for hard materials from cobalt salts and soluble tungstate salts.
Schulz Robert (Brossard CAX) Huot Jean-Yves (St-Hubert CAX) Trudeau Michel (Longueuil CAX), Process for making nanocrystalline metallic alloy powders by high energy mechanical alloying.
Kopatz Nelson E. (Sayre PA) Johnson Walter A. (Houghton MI) Vanderpool Jack E. (Laceyville PA) Shaw Howard H. (Monroeton PA), Process for producing prealloyed tungsten alloy powders.
Kikuhara, Shinji; Inoue, Hitoshi; Uenishi, Noboru; Umemoto, Satoshi, Tungsten alloy grains, processing method using the same, and method for manufacturing the same.
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