Johnson Matthey & Co., Limited

Johnson Matthey Public Limited Company

Johnson Matthey Inc.

Gordon L Selman

Arthur G Knapton

Richard J Midgley

Stephen Lionel Pearce

Ian R McGill

Alan E Heywood

Gerald S Iles

Roy W Rushforth

Barry J Chase

David J Stephenson

Owen N Collier

This invention relates to platinum group metal-containing alloys comprising, apart from impurities:

Platinum group metal-containing alloy

A thermoplastic brazing alloy composition contains a particulate brazing alloy and a flux dispersed in a petroleum wax to form a solid suspension at room temperatures. Preferred petroleum waxes are paraffin wax and microcrystalline wax. On application to a workpiece and heating to brazing temperatures, the wax melts and leaves the brazing site and then volatilizes without leaving any carbonaceous residue and without causing any bubbling or blistering. The use of petroleum waxes is particularly useful when the flux contains a reactive material such as fluoroborate, a silicofluoride or an aluminofluoride.

Brazing alloy composition

This invention relates to catalyst units embodying or consisting of catalytic material in wire or strip (herein referred to simply as 'wire') form and especially to such units for catalytic oxidation of gases. The catalyst unit of the invention is particularly suitable for use in the manufacture of hydrocyanic acid comprises a pack of woven metallic gauzes wherein at least some of the gauzes disposed at or towards the front of the pack are made from wire (as herein defined) having a cross-sectional area greater than at least some of the gauzes disposed at or towards the rear of the pack.

Catalyst units for producing hydrocyanic acid

This invention is concerned with the application of fibrous products from platinum group metal or platinum group metal alloys to the oxidation of ammonia in the manufacture, for example, of nitric acid and to the production of hydrogen cyanide in the Andrassow Process. In particular, the invention relates to a catalyst assembly including an agglomeration or assemblage of randomly oriented fibres made from a platinum group metal or an alloy containing at least one platinum group metal, gold or silver. The fibres used in the catalyst assembly are preferably produced by melt extraction or melt spinning processes.

Fibre packs for ammonia oxidation

A process for producing a metallic article comprising forming a mixture of metallic particles and plastics particles, injecting the mixture under pressure and at elevated temperature into a die, allowing the die to cool and removing from the die the metallic article.

Preparation of metallic article

This invention relates to means for protecting substrates and in particular Ni- and Co-base superalloys from high temperatures, for example temperatures such as typically occur in gas turbine engines. In more detail an article suitable for use all elevated temperature (up to 1600.degree. C. and beyond) comprises a metallic substrate on which is deposited a first coating or layer comprising one or more of the platinum group metals or an alloy including one or more of the platinum group metals on which is deposited a second coating or layer comprising a thermal barrier layer.

Protective layer

Catalytic fibre packs for ammonia oxidation

A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a cylindrical substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.

Resistance thermometers

This invention relates to intimate mixtures of ceramic materials and metals, usually referred to as cermets. A cermet of the invention comprises a first phase of ceramic particles and a second phase of a metallic material wherein at least a major proportion of the particles have their surfaces treated with an additive which forms a material capable of bonding together the materials of the first and second phase. The metallic phase may be gold, silver or a platinum group metal. The ceramic phase may be a refractory oxide of alumina and the additive is derived from at least one of the metals yttrium, aluminium, titanium, vanadium, chromium and nickel. The cermet materials of this invention are particularly useful in the manufacture of erosion resistant components used in glass making operations and in the electrical industry.

Cermets

This invention relates to an electrical connection for use in connection with an apparatus including a container suitable for holding molten glass at a high temperature and electrically connected through the connection to a source of electric current. Typically, the connection comprises a reservoir of electrically conducting material which is liquid at temperatures of operation and a current carrying conductor electrically connected to the said container and mounted for continuous electrical contact with the electrically conducting liquid during movement of the said container.

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London, United Kingdom

Gordon L Selman