Abstract: A fluid driven drilling motor and system includes a flex shaft between the rotor and a cylindrical flow collar. The end of the flow collar opposite from the flex shaft has a bore in fluid communication with a drill bit. Ramped apertures are formed in the side wall of the flow collar. The ramped apertures are in fluid communication with the bore. Drilling fluid flowing under pressure down past the flex shaft is directed and drawn into the ramped apertures along a fluid flow path which spirals downwardly and radially inwardly of the flow collar so as to then flow into the bore. The pressure loss associated with drawing the drilling fluid down to the drill bit is thereby minimized.

Abstract: A method for forming composite articles, particularly ceramic articles, from particles or fibers mixed in a thermally activated reactant gas stream. The particles or fibers are codeposited with material produced by chemical vapor deposition (CVD) onto a heated substrate until the desired thickness of composite is obtained. Removal of the substrate yields a near-net shaped codeposited composite article having a chemical vapor deposition produced matrix with particles or fibers embedded therein in a generally uniform distribution. The method provides high deposition rates, and the composite articles produced may have enhanced strength, thermal shock resistance, and corrosion resistance at elevated temperatures.

Abstract: Disclosed is a method for forming composite articles, particularly ceramic articles, from particles or fibers mixed in a thermally activated reactant gas stream. The particles or fibers are codeposited with material produced by chemical vapor deposition (CVD) onto a heated substrate until the desired thickness of composite is obtained. Removal of the substrate yields a near-net shaped codeposited composite article having a chemical vapor deposition produced matrix with particles or fibers embedded therein a generally uniform distribution. The method provides high deposition rates, and the composite articles produced may have enhanced strength, thermal shock resistance, and corrosion resistance at elevated temperatures.