Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 1998

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: diffusion coating

Sortuj według:

Ogranicz wyniki do:

Modification of diffusion coatings structure by laser heat treatment.

Przybyłowicz K., Depczyński W., Mola R.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1043-1046

The effect of laser heat treatment (LHT) of selected steel grades after various chemical heat-treatments (CHT) on the structure and microhardness has been investigated. The specimens were subjected to following CHTs: boronizing (45), silico-boronizing (50HS) and chromizing (NC6). The LHT has been carried out by means of CO2 laser beam of maximum output of 6 kW and applied power 1200-2000 W at scanning rate 500 - 700 mm/min. Considerable refining and homogenization of the structure have been observed. It has been stated that LHT can eliminate the negative effects of the CHT (coarse grain and low hardness of the substrate).

Heat-resisting CoNiCrAl coatings obtained by the Arc-PVD method and chromoaluminized on the nickel base superalloys.

Swadźba L., Maciejny A., Mendala B.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1067-1072

In the article the investigation results of obtaining and properties of the heat-resisting MeCrAlX coatings are presented. The coatings were formed on nickel. In the first stage the CoCr coatings were obtained by the Arc-PVD method (cathodic vacuum arc evaporation). Basic parameters of coatings formation were determined. High efficiency of the Arc-PVD method in the deposition from one or two sources of the complex chemical composition are shown. Relationships between the chemical composition of targets and the chemical composition of the coatings obtained by the Arc-PVD method were determined. Targets with the content of 70 wt. % Co and 30 wt. % Cr. The basic deposition parameters were determined. In the second stage coatings underwent the diffusion chromoaluminizing process. Combining the PVD and diffusion processes allowed to eliminate the substrate detrimental elements: Mo, W and Ti lowering oxidation and 'hot corrosion' resistance from the coatings.