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Flame spray powder
| Details |
Inventors: Kammer, Paul A.; Yurasko, Jr., George; Zmrzlik, Karel;
Assignee: Eutectic Corporation (Flushing, NY)
Primary Examiner: Beck; Shrive P.
Assistant Examiner:
Attorney, Agent or Firm: Hopgood, Calimafde, Kalil, Blaustein & Judlowe
A free-flowing self-bondable flame spray powder derived from an atomized alloy powder is provided in which the particles are characterized by aspherical shapes and have an average particle size within the range of about plus 400 mesh to minus 100 mesh. The aspherically shaped powder is further characterized by a specific surface of about 180 cm.sup.2 /gr and higher and has a composition consisting essentially of a solvent metal of melting point in excess of about 1100.degree. C. whose negative free energy of oxidation ranges up to about 80,000 calories per gram atom of oxygen referred to 25.degree. C. The solvent metal contains at least one highly oxidizable solute metal in an amount of at least about 3% by weight, the oxidizable metal having a negative free energy of oxidation of at least about 100,000 calories per gram atom of oxygen referred to 25.degree. C. |
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DETAILED DESCRIPTION What is claimed is: 1.
A free-flowing self-bondable flame spray powder derived from an atomized alloy, said powder having particles characterized by aspherical shapes and having an average particle size within the range of about plus 400 mesh to minus 100 mesh, said aspherically shaped powder being further characterized by a specific surface of about 180 cm.
sup.
2 /gr and higher, said flame spray powder having a composition consisting essentially of a solvent metal of melting point in excess of about 1100.
degree.
C.
whose negative free energy of oxidation ranges up to about 80,000 calories per gram atom of oxygen referred to 25.
degree.
C.
and being pre-alloyed with at least one highly oxidizable solute metal in an amount of at least about 3% by weight, said oxidizable metal having a negative free energy of oxidation of at least about 100,000 calories per gram atom of oxygen referred to 25.
degree.
C.
2.
The free-flowing self-bondable flame spray powder of claim 1, wherein the average particle size of said aspherical powder ranges from about 325 mesh to 140 mesh, wherein the amount of said oxidizable metal ranges from about 4% to 20% by weight of said alloy powder and wherein the specific surface of the powder is about 250 cm.
sup.
2 /gr and higher.
3.
The free-flowing powder of claim 2, wherein said solvent metal is selected from the metals consisting of iron-group Ni, Fe, Co, and iron-group base alloys Ni-base, Fe-base, Co-base alloys and mixtures thereof.
4.
A free-flowing one-step self-bondable atomized flame spray powder having particles characterized by randomly irregular aspherical shapes and having an average particle size ranging from about 325 mesh to 140 mesh, said randomly irregular aspherically shaped powder being further characterized by a specific surface of about 250 cm.
sup.
2 /gr and higher, said atomized flame spray powder being formed of a solvent alloy selected from the iron-group base alloys consisting of Ni-base, Fe-base, Co-base alloys and mixtures thereof of melting point in excess of 1100
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