Abstract: A thermal spray powder comprising particles with a central core of a material selected from the group consisting of zirconium oxide, magnesium oxide, hafnium oxide, cerium oxide, yttrium oxide and combinations thereof. The core then has discrete aluminum particles and silicon dioxide homogeneously disposed in a binder deposited thereon to form the thermal spray powder which may be thermal sprayed to produce an abradable and erosion resistant coating.

Abstract: An apparatus for equilibrating the temperature of the eluate of a separating column entering a flow cell includes the provision of a heat transfer relationship between the outlet fluid and the inlet conduit whereby the temperature of the fluid, as it passes through the flow cell, is stabilized.

Abstract: A liquid chromatography column assembly includes a separation column having stationary phase retaining frits is positioned within a housing adapted to accept conventional column termination fittings. The assembly includes a sealed cylindrical cavity to ensure radial distribution of the incoming fluid across the cross-section of the column.

Abstract: A thermal spray composite is disclosed, comprised of a base constituent formed from at least one of the metals nickel, iron, cobalt and chromium, plus additional constituents comprising aluminum and yttrium oxide. Optionally, the base constituent additionally contains aluminum, and the additional constituents may further include molybdenum and/or cobalt. In a preferred form, the composite is a powder having an alloy core of the base constituent, the core having fine particles of the additional elements secured thereto with a binder. The process of thermal spraying the composite is also disclosed, and the resulting coatings have a high degree of high temperature corrosion resistance and tenacity compared to prior art thermal sprayed coatings.

Abstract: A thermal spray composite is disclosed, comprised of a base constituent formed from at least one of the base metals nickel, iron and cobalt, and at least one of the modifying elements chromium and aluminum, plus individual constituents aluminum, cobalt and, optionally, molybdenum. In a preferred form, the composite is a powder having an alloy core of the base metal and the modifying element, the core having fine particles of the individual elements secured thereto with a binder. The process of thermal spraying the composite is also disclosed, and the resulting coatings have a high degree of high temperature corrosion resistance and tenacity compared to prior art thermal sprayed coatings.

Abstract: A monochromator comprises a first and a second concave grating. An entrance slit is imaged by the concave grating in the plane as a spectrum. A disc comprises a spiral slot. A section of the slot forms an intermediate slit periodically sweeping transversely across the spectrum. A concave mirror images the fanning point of the concave grating. Thereby the fanned beams are recombined to a single beam. An exit slit is located in an image plane in which an image of the entrance slit is generated. The spectrum can be scanned quickly and cyclically without the gratings having to be rotated. There is also the effect of a double monochromator. Another embodiment comprises two concave mirrors to generate the image.

Abstract: A flame atomic absorption spectrophotometer burner apparatus for burning a fuel such as acetylene as one essential gas in the oxidant such as nitrous oxide as another essential gas includes a system for safely changing oxidants between air and nitrous oxide during start up. The system has a pressure sensor for sensing the pressure of at least one of the essential gasses, and a valve selectively operable in response to the pressure sensor for effecting the supplying of air as the oxidant and continuing to supply air as the oxidant when the pressure of the essential gas is low and for selectively switching to nitrous oxide as the oxidant only when the pressure of the essential gas is high.

Abstract: A drive shaft coupling apparatus which includes a first segment of a drive shaft, a ferromagnetic end piece mounted on one end of the first segment to provide linear play and angular flexibility with respect to the axis of rotation of the first segment, a second segment of said drive shaft, a motor for driving one of the segments of the drive shaft, a second end piece for providing a magnetic field which is mounted on one end of the second segment to provide linear play and angular flexibility with respect to the axis of rotation of the second segment, and insert for frictionally coupling the end pieces, the end pieces and the insert for frictionally coupling being arranged and dimensioned to provide a magnetic force between the end pieces sufficient to attract one end piece to the other end piece to gradually increase the rotational speed of said one end piece until it reaches the same speed as said other end piece, but insufficient to overload the motor and prevent it from turning.

Abstract: An automatic gas flow safety device or system is provided for use with an atomic absorption spectrophotometer burner. Generally speaking, a dual function pneumatic and electrical safety device is described which provides for a cut-off of the (acetylene) gas to the burner, upon monitoring an unacceptable air flow or electrical condition, to avert possible flash-backs at the burner. The invention basically comprises a pneumatic and electrical actuated means to control the on/off flow of gas to the burner determinative on the status of the air pressure and electrical power to the system.

Abstract: In a grating spectrometer a signal spectrum is measured repeatedly while inserting different filters. The number of the filters and measurements correspond to the number of the occurring grating orders not suppressed. The signal spectra and the transmission characteristics of the filters are stored. A system of equations is achieved, from which a computer calculates the signal partial spectra associated with the individual grating orders. A total spectrum is composed from these signal partial spectra. Separation of the higher grating orders need not be effected optically, for example by cut-off filters.

Abstract: A powder feeding system for a thermal spray gun provides uniform control of powder feed rate with a minimum of pulsation during operation and without feeding during idle mode. The feeder is comprised of an enclosed hopper for containing a powder to be thermal sprayed, a carrier conduit connected between a carrier gas supply and a thermal spray gun, a feed gas conduit for discharging a regulated supply of feed gas under pressure into the hopper, and one or preferably more powder intake orifices extending from the carrier conduit into the hopper below the normal minimum level of powder. The intake conduits have a geometric design and arrangement such that there is no gravity flow of powder therethrough into a carrier gas stream in the absence of a feed gas flow therethrough. The axes of the intake orifices extend away from the carrier conduit at an acute angle to the axis of the carrier conduit as defined by the direction of carrier gas flow.

Abstract: A slip clutch assembly includes a mandrel having a spring wound on a portion thereof. The spring effects torque transfer and, when further rotation is impaired, unwinds about the mandrel to prevent excessive torque transfer. Even after torque transfer is removed the driven element is securely positioned by the spring force.

Abstract: A needle is movable by a servomotor between a position of rest and an operating position in a stationary housing. The needle includes a tip and a first lateral opening close to the tip and a second lateral opening spaced therefrom. A longitudinal passage of the housing through which the needle is guided includes a pair of seals at the lower end and a seal at the upper end. A carrier gas conduit ends in the longitudinal passage axially inwards of the seals. A port communicating with atmosphere ends axially inwards of the upper seal. The arrangement permits a sample extraction from sample vessels closed by a membrane without the sample vessels having to be lifted and pressed against the needle.

Abstract: A solvent delivery system which provides a substantially uniform flow includes two synchronized pistons adapted to serially transport successive solvent compositions from one piston to the other prior to delivery to a chromatography column.

Abstract: A detector assembly includes means for determining the fluorescence characteristics, the ultraviolet absorbance characteristics and the electrical conductivity characteristics of a single sample of an eluate of a chromatographic separating column.

Abstract: A sample vessel container in a sampling device for use in gas chromatography includes a rotatable metal block having a circular array of axial bores for accommodating a plurality of sample vessels. A heating jacket operative as an electric heater is non-rotatably connected to a housing, which jacket tightly surrounds in material contact with, and is adapted to heat, the rotatable metal block.

Abstract: A pulse damper for use in a liquid chromatographic solvent delivery system includes a cavity within a housing containing a compliant medium. The compliant medium being an elastomer. As a consequence, a solvent flow volume can be precisely formed and maintained.

Abstract: A system for assuring a more even powder flow rate in a flame spray gun. A powder metering device entrains powder into a gas. The gas with entrained powder is coupled to the flame spray gun. Vibration means, coupled to the powder and gas conduit, is provided to prevent any powder from settling in the conduit.

Abstract: An apparatus for positioning a thermogravimetric furnace includes a furnace mounting bracket which is rotatable about and linearly translatable along a single axis. In addition, simultaneous rotational and linearly movement of the furnace is excluded.

Abstract: The present invention is directed to an improved test wafer for testing the overlay alignment of a second level pattern over a first level pattern for testing lithographic equipment used in making microcircuits, which includes four conductors with circuitry provided for each conductor measuring the conductance thereof, the conductors being constructed and arranged so that the conductance of the first conductor relative to the second conductor, and the conductance of the third conductor relative to the fourth conductor is indicative of the offset of said first level pattern with respect to said second level pattern.