Abstract: Abradable coatings for turbine engine shrouds are formed from biscuits formed of silicon-diffused powdered alloy compositions which are processed with an HF precursor to strip oxides from the coating during processing, the alloy blends comprising MCrAl(Y)n alloys in which n is 0, 1 or more.

Abstract: Abradable coatings for turbine engine shrouds are formed from biscuits formed of silicon-diffused powdered alloy compositions which are processed with an HF precursor to strip oxides from the coating during processing, the alloy blends comprising MCrAl(Y)n alloys in which n is 0, 1 or more.

Abstract: Abradable coatings for turbine engine shrouds are formed from biscuits formed of silicon-diffused powdered alloy compositions which are processed with an HE precursor to strip oxides from the coating during processing, the alloy blends comprising MCrAl(Y).sub.n alloys in which n is 0, 1 or more.

Abstract: Abradable coatings for turbine engine shrouds are formed from biscuits formed of silicon-diffused powdered alloy compositions which are processed with an HF precursor to strip oxides from the coating during processing, the alloy blends comprising MCrAl(Y).sub.n alloys in which n is 0, 1 or more.

Abstract: Steam turbine fluid directing components are improved in erosive wear resistance by application of either relatively tougher and relatively less hard thermal spray or relatively harder and relatively less tough diffusion alloy surface modification to different portions of the component as a function of the locally greater or locally smaller angle of attack of solid particles on those portions in the use condition of the component.

Abstract: Steam or gas turbine components comprising chromium steel have their fluid directing surfaces protected from corrosion by a surface layer coating consisting essentially of major weight amount of nickel and minor weight amounts of zinc, optionally with boron added, over a nickel preplate which limits deleterious diffusion of zinc into the surface substrate.

Abstract: Erosion and abrasion resistant refractory metal carbide articles are provided having multiphase alloy of borides including titanium boride, binder metal boride, and titanium-binder metal-refractory metal borides by diffusion of titanium initially to convert the refractory metal carbide to its constitutents which are then reacted with boron, forming a new added surface in replacement of the original article surface, and bridging the original surface locus.

Abstract: Mechanical seals are imroved in wear properties, erosion, corrosion and galling resistance by forming a diffusion coating in the seal structure surface comprising an intermetallic compound of the seal structure iron, nickel or cobalt base metal and one or more of aluminum, boron, silicon and carbon.

Abstract: Process stream sensor tube apparatus adapted for sensing process conditions in a process stream having fine particulate and/or chemical erosive or corrosive agents, the apparatus (10) comprising the sensor tube (20) and a housing (12) therefor having its external surfaces conditioned against corrosive or erosive wear by a coating (26) comprising at least one carbide, boride, aluminide or silicide alloy of at least one of iron, nickel, or cobalt formed in situ locally at the housing external surface portion normally subject to erosive wear.

Abstract: Centrifugal pump adapted for pumping finely particulate slurries, comprising a steel housing having an inlet and an outlet and a volute therebetween, a motor mounted on the housing, and an impeller rotatably driven within the volute by the motor for pumping fluid through the housing along a flow path extending through the volute and between the inlet and outlet, the pump having surfaces conditioned against erosive wear along the flow path comprising iron carbide and iron boride formed in situ locally at pump steel surfaces subject to erosive wear.

Abstract: Tubing, pump cylinders and tank vessels, and similar tubular apparatus for containing and conveying from a supply thereof a highly erosive composition slurry comprising fine particulates in a liquid medium and free of gross particulates along a predetermined path extending from a slurry supply is provided, and method therefor, the apparatus comrising a steel wall of elongated tubular configuration defining an interior surface confining the slurry on the predetermined path, the surface tending to erode though passing contact with the slurry, and an erosion resistant diffusion coating on the surface having an inner layer comprising intimately dispersed iron carbide and an outer layer consisting essentially of iron boride, in erosion blocking relation during conveyance of the slurry through the tubular apparatus.

Abstract: Superalloy structures, such as high temperature components for jet engines and the like, are provided with aluminum-containing diffusion coatings enabling guantum extensions of service life through unique distributions therein of rhodium. The rhodium is prediffused into the alloy structure, and the resultant distribution minimizes aluminum migration into the structure and thus maximizes protective coating performance.