Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Patent
1999-04-01
2000-12-19
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
75356, B22F 100
Patent
active
061622761
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a coating powder for use in different coating technologies such as the different variants of thermal spraying, for example, plasma spray, high velocity oxy-fuel spraying (HVOF) and detonation spray, the same as other methods like coating by means of laser or plasma transferred arc (PTA) welding. By means of said methods the coating powder according to the invention can be applied to different highly stressed construction units which are exposed to the most varied stresses such as abrasive and erosive wear, corrosion and high temperatures, or to the most varied combinations of said stresses, being used in the most diverse technical fields. Examples of use are coated construction units in vehicles and machinery construction, chemical and petrochemical installations and many other branches of the economy.
Different hardmetal-like coating powders are widely used in technology. They are characterized by a carbide hard material such as WC or Cr.sub.3 C.sub.2 embedded in a ductile binder matrix. The most important systems for coatings are WC-Co and Cr.sub.3 C.sub.2 -NiCr. WC-Co shows a very high resistance to wear. The use at elevated temperature (up to a maximum of 450.degree. C.) and simultaneous chemical strain is limited. It has been sought by using other binders like Ni and alloys with chromium specially to improve the resistance to corrosion which due to the low alloying property of the system is only limitedly possible. On the other hand, Cr.sub.3 C.sub.2 -NiCr can be satisfactorily used at high temperatures (up to 750-800.degree. C.) and corrosive strain. But the resistance to wear of the system is lower than that of WC-Co.
Because of their great hardness, low density and good availability, there have been repeatedly undertaken in the past tests for developing a hardmetal-like powdery coating material on a base of cubic Ti hard material phases [TiC or Ti(C,N).sup.7 ] from which coatings not having the above mentioned disadvantages can be produced using current coating technologies, specially technologies associated with the process group of thermal spray, for example, plasma spray, high-velocity oxy-fuel spraying (HVOF) and detonation spray, the same as other methods such as coating by means of laser or plasma transferred arc (PTA) welding.
In DD 224 057 has been described a coating powder having a base of TiC which together with at least one of the metals Ni, Co, Cr, W as well as B and/or Si, also contains Mo or Mo.sub.2 C and free carbon. Individual components such as Mo.sub.2 C can here be bonded on the TiC. Due to the fact that there exists no composite powder having a hardmetal-like microstructure and the individual powder components are very coarse, no coatings very resistant to wear can be produced.
In DE 41 34 144 has been described a carbide spray powder where by coating with an active carbon the core should be protected against oxidation phenomena. As spray powders to be coated, there are mentioned, also titanium carbide and titanium carbonitride, in a matrix of metals of the group iron, nickel and cobalt.
Several patents describe methods for preparing hardmetal-like coatings with TiC as hard material phase or coated construction parts. WO 87/04732 describes a method for preparing a wear-resistant coating from a powder material which contains 10-50% by weight TiC and a Fe and/or Ni alloy, or a Co alloy. In these compositions the portion of the hard material phase is too low for decisively increasing the wear resistance.
U.S. Pat. No. 4,233,072 uses for coating piston rings mechanical mixtures of the composition 60-85% Mo, 10-30% of a NiCr alloy and 5-20% TiC. Together with the disadvantages due to the mechanical mixture, the hard material portion is also exceedingly low.
S. Economou et al (Wear, Vol. 185, 1995, pp. 93-110) describe several alloy variants of hardmetal-like coating powders with TiC, TaC or (Ti,Ta)C as hard material phase as well as NiCrMo or Mo as binder phases. The portion of the carbide hard materials was 60% vol. Said coating powder was prepared from the
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Berger Lutz-Michael
Maentylae Tapio
Nebelung Manfred
Vuoristo Petri
Fraunhofer-Gesellschaft Zu Forderung der Angewandten Forschung e
Mai Ngoclan
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