NEW PATENTS: July 1979
NEW PATENTS: July 1979
METALS AND ALLOYS
international business machines corp. British Patent 1,539,686
Improved ferromagnetic alloys for use such as in bubble domain devices have the general formula Ni100−x−yFexPdy, where x is 25−80 at. % and y is 25−65 at. %.
Nickel Glow Plug Alloys
ngk spark plug company ltd. British Appl. 2,003,501
An alloy for use in a glow plug heater used in I.C.E., particularly diesel engines, contains Ni and between 0.05 and 2.0% of Y, Zr and/or Ru. The additions prevent grain coarsening and high temperature degradation without affecting the electrical resistance of the material.
sony corp. British Appl. 2,003,772
A continuous-casting process for the manufacture of amorphous alloys is applicable to Fe-P-C alloys containing minor amounts of Ru, for instance Fe78Ru2P13C7.
Ruthenium and/or Iridium-Containing Pyrochlore Compound
exxon research & engineering co. U.S. Patent 4,129,525
Electrically conductive pyrochlore compounds have the formula A2 (B2−xAx)O7−y where A is Pb and/or Bi, B is Ru and/or Ir, x is 0–1.0 and y is 0–1.0.
wacker-chemie g.m.b.h. U.S. Patent 4,130,707
The adhesive compounds contain vinyl-containing organopolysiloxanes, organopolysiloxanes containing Si-H atoms and Group VIII metal catalysts (Pt-olefin complexes). Conductive materials (Al or Ag) are added to the adhesives to form flexible heating resistors.
ELECTRODEPOSITION AND SURFACE COATINGS
siemens a.g. British Patent 1,539,303
Pore-free, ductile, bright coatings are obtained by electrodeposition from ammonia-free baths containing a diglycocoll Pd complex.
High Temperature Resistant Coatings
general electric co. U.S. Patents 4,123,594-95
Fe-Co-Ni superalloys are protected from high temperatures using a diffused graded coating which on the side adjacent to the superalloy contains 10−50% Cr, up to 30% Al, up to 10% Hf, up to 3% Y and up to 30% of Pt, Rh and/or Pd while on the outside the coating contains 10−50% Al and 1−40% of Hf, Pt, Rh and/or Pd, the balance being elements diffused out.
LABORATORY APPARATUS AND TECHNIQUE
ferranti ltd. British Patent 1,540,619
A pellet of Pt black powder, compressed under high pressure (50 tsi), is used as the cathode of a gas discharge layer. The electrode contains up to 25% of cupric oxide to reduce unwanted constituents of the gas mixture.
Oxygen Measuring Probes
dragerwerk a.g. British Patent 1,540,751
A microprobe for measuring O2 partial pressures, especially in aqueous biological solutions, has a measuring electrode made of a thin film of noble metal or alloy, preferably Pt or Au, and a counter electrode of Pt, Ag or Au.
I.C.E. Exhaust-Gas Purification Catalyst
general motors corp. British Patent 1,537,732–33
An I.C.E. exhaust gas catalyst comprises particulate Al2O3 of specified pore characteristics impregnated to a depth of 90–250 μm with Pt and optionally Pd.
Intermetallic Three-Way Catalyst
johnson matthey & co. ltd. British Appl. 2,002,648
Three-way catalysts for I.C.E. purification are formed from an intermetallic compound supported on a metal or ceramic, preferably with an intermediate refractory metal oxide layer between the catalyst and support. The intermetallics have the formula AxBy, where A is a Group VIII metal and B is Al, Sc, Y, the lanthanides, Ti, Zr, Hf, V, Nb or Ta. Ni3Al and Ni2·86Pt0·14Al intermetallics are used in the examples.
Platinum Group Metal Catalyst
gulf research & development co. U.S. Patent 4,122,039
The catalyst is prepared by coating a support with a Pt or Pd salt and a Rh salt, calcining, then coating with a Ru salt and an oxide, salt or acid of phosphorus and then calcining again. The catalyst is used for treating I.C.E. exhaust gases.
Lanthanum Rhodite Catalyst
johnson matthey & co. ltd. U.S. Patent 4,127,510
The catalyst is of formula MxM′yOz (M is Li, Na, K, Mg, Ca, Sr, Ba, Al, Sc, Y, a lanthanide, Ti, Zr, V, Cr, Mn, Fe, Co, Ni, Cu and/or Zn, M′ is Ir, Rh, Pt, Pd or Ru, y is 0.1–3.0, z is 2–7, x has a value such that the compound is electrically neutral). The catalyst may be disposed on a ceramic or metallic support optionally with an intermediate refractory oxide.
Iridium Catalyst for Treating Light Petroleum Fractions
ste. nationale elf aquitaine French Appl. 2,376,203
A catalyst for the simultaneous production of ethane and high octane petrol by the selective hydrogenation of light petrol fractions consists of a porous refractory oxide support, Ir and Rh, Os, Pt, Pd, Ru, Ni, Fe or Co.
Supported Intermetallic Catalysts
johnson matthey & co. ltd. French Appl. 2,379,317
A catalyst, for use in the production of nitric acid from NH3 consists of a support coated with a refractory metal oxide and an intermetallic compound of formula MxM′y (M is Ru, Rh, Pd, Ir or Pt, M′ is Al, Sc, Y, the lanthanides, Ti, Zr, Hf, V, Nb and Ta, x and y are each at least 1).
dow corning corp. British Patent 1,542,072
A release coating for use on paper, fabric, foil, etc. contains a diorganopolysiloxane, a toluene-soluble resinous copolymer containing organo-silicon units and a Rh catalyst of formula RhX3(SR′2)3 or Rh2(CO)4X2, where X is a halogen, R′ is an alkyl, aryl, aralkyl or alkaryl group or R″3SiQ, where Q is a C1−6 divalent aliphatic hydrocarbon radical. The preferred Rh catalyst is RhCl3(n−Bu2S)3.
Homogeneous Hydroformylation Co-Catalyst
johnson matthey & co. ltd. British Appl. 2,000,124
The hydroformylation of olefins is catalysed by a system containing a Rh complex, particularly a hydrido carbonyl triphenyl-phosphine or -phosphite complex and a co-ordination complex of a Group VI or VIII transition metal, preferably Pd, Pt, Ru, Cr, Mo, W, Fe or Co.
Fuel Cell Reservoir
united technologies corp. British Patents 1,541,541–42
An absorbent reservoir, located adjacent to the catalyst layer of a fuel cell, has shallow surface areas impregnated with a hydrophobic area and feed areas of hydrophobic material extending from the non-catalytic surface to the impregnated areas. The catalyst layer, which is preferably bonded to the reservoir material, is of Pt/p.t.f.e. and the porous reservoir material can be made from C paper, if the electrolyte is phosphoric acid, or from Ag felt or sintered Au or Ag powder if the electrolyte is KOH.
allied chemical corp. British Patent 1,539,287
The action of a heat pump depends on the thermal cycling of a polyhalomethane in a solvent which is an asymmetrical furan derivative. One of the stages in the synthesis of the furan derivative is the conversion of a furfuraldehyde to a tetrahydro furfuryl alcohol with H2 in the presence of, for instance, a Rh-Pt oxide catalyst.
Recovery of Platinum Group Metals
matthey rustenburg refineries (pty) ltd. U.S. Patent 4,127,458
The metals are recovered from aqueous effluent from a platinum group metal refinery by adjusting the pH of the effluent to at least 10, heating it at above 60°C, electrolysing it using an electrode consisting of Ru, Rh, Pd, Ir, Pt; and/or their alloys so as to precipitate any metal present and filtering off the precipitated metal.
Glass Optical Fibres
standard telephones & cables ltd. British Patent 1,541,442
Optical fibres are manufactured by drawing molten glass fibres from a double crucible, made from Pt, which is designed to allow continuous fibre withdrawal without glass replenishment.
ELECTRICAL AND ELECTRONIC ENGINEERING
international business machines corp. British Patent 1,537,816
An acoustical-optical device is obtained by bonding together a piezoelectric crystal and an optical deflection crystal by way of a bond-enhancing metal (such as Cr, Al or Ti) and a layer of Pt, Pd or Au.
Palladium-Containing Multilayer Ceramic
international business machines corp. U.S. Patent 4,109,377
A multilayer ceramic for carrying semiconductor chips consists of layers of a mixture of a metal and its oxide, such as Pd, on unfired ceramic layers and drying.
Platinum Group Metal Contacts for Solar Cells
j. lindmayer U.S. Patent 4,124,455
A contact for a solar cell consists of a Ti group element in contiguous relationship with the cell, a mixture of Ti group element and platinum group metal layered over this, a layer of a platinum group metal over this and a body of Ag or other contact metal adhered to this.
fujitsu ltd. U.S. Patent 4,128,823
A switch consists of two sets of rod-shaped fixed electrodes and one cylindrical moving electrode of permanent magnetic form. Cracking of the contact layers is avoided by using Ag, Ni, Cu or alloys of these metals as a first adhesive layer coated with Rh, W, Re, Ru or Ag-W alloy.
international business machines corp. British Patent 1,538,824
A radiation pyrometer consists of a thermally conductive, electrically insulating substrate, such as glass, coated with at least two films of metal separated by a film of thermally conductive, electrically insulating material, for instance, SiO2. The metal layers may be of Os or Pt, and the device is provided with electrodes of Ag.
deutsche gold- und silber-scheideanstalt British Patent 1,538,948
A precision resistor for a resistance thermometer is made by sputtering Pt on to an insulating support in an atmosphere of Kr or Xe and O2.
commonwealth scientific and industrial research organisation British Appl. 2,000,642
The Pt thimble normally used to protect a thermocouple in an open-ended (Al2O3) sheath, such as in glass making, is replaced by a Pt foil integrally bonded across the tube.
Glass-Free Temperature Sensor
johnson matthey & co. ltd. British Appl. 2,002,175
The temperature coefficient of resistance disadvantages of thin resistance films on nonconductors are avoided by using thick metal films (at least 2.5 μm thick) applied to the nonconductor by screen printing. The metal may comprise Ru, Rh, Pd, Ir, Pt, Ni, Cu, Ag, Au, Fe, Co or their alloys.
Molybdenum-Iridium Alloys for Thermocouples
national aeronautics & space administration U.S. Patent 4,111,718
Bimetallic thermocouple sensor metals consist of Ir with 0−22 at.% Mo dissolved in it.
imperial chemical industries ltd. British Appl. 2,002,748
1-hydroxyphenoxy-3-ureido-ethylamino-2-propanol derivatives, used as cardiac stimulants, are prepared by a route which includes use of benzyloxy protecting groups, which are subsequently removed by hydrogenolysis with a Pd catalyst.
u.s. secretary of commerce British Appl. 2,003,468
4-carboxyphthalato(1,2-diamino-cyclohexane) Pt(II) and Group IB metal salts are used to alleviate murine leukaemia. The compounds are prepared by reacting dichloro(1,2-DAC)-Pt(II) with AgNO3 and adding benzene tricarboxylic acid to precipitate the desired product.
Protective Packaging for Pharmaceuticals
astra lakemedel a.b. British Appl. 2,003,821
Pharmaceutical preparations sensitive to oxidation, packed in ampoules, disposable syringes or vials, are enclosed in an outer container of O2-impervious material into which H2 and a catalyst are introduced to produce an O2-free package. The catalyst is preferably a platinum group metal, such as 5% Pd/C.
Gold Dental Alloy
pennwalt corp. U.S. Patent 4,123,262
The alloy consists of 50−58% Au, 0.5−10.5% In, 0.5−8.5% Sn or 1.0−3.0% Ga, and the balance Pd.
deutsche gold- & silber-scheideanstalt German Offen. 2,813,813
A dental alloy contains 30−55% Au, 30−60% Pd, 1−12% Sn, 0−10% In, 0.1−3% Ge and 0.05−1% Re and/or Ru.
Pt-Clad Bone Joint Prosthesis
johnson matthey & co. ltd. German Offen. 2,824,063
A bone prosthesis is made of, for instance, stainless steel and has a surface coating of Pt, Ru or Ir or an alloy of at least one of these metals, preferably with Pd, Rh, Au and/or a base metal. The joint has good tribological properties.