73results about How to "Improve anti-sulfur performance" patented technology

The sulfidation resistance of a silver-base material coating is further improved by making a concentration gradient of silver, oxygen and of one or more oxidizable alloying elements that may be present in the material, from the free surface of the coating up to a depth comprised between 10 nm and 1 μm and more particularly between 100 nm and 1 μm. Thus, the coating comprises a stack of one main layer made from silver-base material and of one oxidized thin film. The thin film, with a thickness comprised between 10 nm and 1 μm, thus presents a decreasing silver concentration gradient from the interface between the thin film and the main layer to the free surface of the thin film. Deposition of the coating on a support can be achieved by two successive physical vapor deposition steps, and more particularly by magnetron cathode sputtering.

A sliding fluid level-detecting device which is mounted in a fuel tank of a vehicle and detects a remaining amount of a liquid fuel in the tank by sliding, on a plurality of stripes of an electrode formed at an electrode part electrically connecting with a fuel meter, a contact point provided on a slider interlocking with displacement of a float floating on a fluid surface of the liquid fuel, wherein the electrode is formed out of a glass-incorporated silver-palladium alloy where glass is mixed in an amount of 30 to 50 parts by weight per 100 parts by weight of a silver-palladium alloy and the contact point is formed out of a conductive material having a Vickers hardness (Hv) of 190 to 250.

The invention discloses a CeO2 based SCR catalyst and a preparation method thereof. The preparation method comprises the following steps: taking a proper amount of a metal oxide powder containing CeO2 or a metal salt solution including soluble salt of Ce; soluble salts; taking a proper amount of a mixed water solution containing soluble phosphate and soluble salt of zirconium, wherein the molar ratio of Zr<4+> and PO43 in the mixed water solution is 0.5-2, and the ion total concentration of Zr<4+> and PO4<3-> is 0.1-5mol / L; forming a porous heteropoly acid substance by the Zr<4+> and PO4<3-> in the mixed aqueous solutions; adsorbing the heteropoly acid substance on the surface of metal oxide by using an impregnation method, or complexing the soluble salt solution of Ce and the heteropoly acid substance to form sol under the assistance of a complexing agent by using a sol gel method; and finally drying and roasting to prepare a catalyst powder. The mass fraction of metal oxide in the catalyst is 60%-95%, and the mass fraction of heteropoly acid substance is 5%-40%. The catalyst prepared by the invention has strong water thermal aging and sulfuration resistance ability, and low cost.