45results about How to "Suppression of surface defects" patented technology

The invention discloses a silicon wafer polishing composition in the field of chemical mechanical polishing (CMP). The polishing composition comprises silica, a polishing interface control agent, a surfactant, a chelating agent, an alkaline compound and water, wherein the particle diameter of the silica in the polishing composition is between 1 and 200 nm; the content of the silica is between 0.05 and 50 weight percent; the polishing interface control agent is polyhydroxy cellulose ether; the content of the polishing interface control agent is between 0.001 and 10 weight percent; the content of the surfactant is between 0.001 and 1 weight percent; the content of the chelating agent is between 0.001 and 1 weight percent; the content of the alkaline compound is between 0.001 and 10 weight percent; the balance being water; and the PH value is between 8.5 and 12. The polishing interface control agent can control a polishing interface between abrasive particles and a polishing object in the chemical mechanical polishing process in order that the surface of the polished silicon wafer is more perfect. The polishing composition is in particular suitable for polishing the silicon wafer and has the advantages of rapid polishing speed, little surface defect and high planeness; and the polished silicon wafer has few metal ion contaminants and is easy to clean.

A chemical mechanical polishing aqueous dispersion includes (A) silica particles, and (B1) an organic acid, the number of silanol groups included in the silica particles (A) calculated from a signal area of a ²⁹Si-NMR spectrum being 2.0 to 3.0×10²¹/g.

The invention relates to a chemical mechanical polishing composite of stainless steel surface polishing; the polishing composite is composed of grinding material, oxidizer, polishing accelerant, metalchelator, penetrant, and surfactant; the invention is characterized in that: aluminum oxide sol, namely hydrated alumina dispersed in acidic aqueous solution in sol state, is added, the hydrated alumina can be boehmite, fake boehmite, diaspore or gibbsite.

Systems and methods for suppressing magnetically active surface defects in superconducting quantum circuits are provided. A method includes providing one or more superconducting quantum circuits, and arranging the one or more superconducting quantum circuits in a hermetic enclosure capable of isolating the one or more superconducting circuits from ambient surroundings. The method also includes controlling an environment in the hermetic enclosure to suppress magnetically active surface defects associated with the one or more superconducting quantum circuits. In some aspects, the method further includes introducing an inert gas into the hermetic enclosure to passivate a surface of the one or more superconducting quantum circuits. In other aspects, the method further includes coating a surface of the one or more superconducting circuits with a non-magnetic encapsulation layer. In yet other aspects, the method further includes irradiating the one or more superconducting circuits using ultraviolet light.

A high-strength cold-rolled steel sheet providing a product with a good surface condition after press forming, having excellent bake hardenability and anti room temperature aging property, and having a dual phase structure with a tensile strength of at least 340 MPa is provided.

A high-strength cold-rolled steel sheet has a structure comprising a main phase which is a ferrite and a secondary phase which is a low temperature transformation product including a martensite and has a hardness distribution of the ferrite phase in an arbitrary cross section having a length of 10 mm in the widthwise direction of the sheet which satisfies the relationship prescribed by (Hv_(max)−Hv_(ave))<0.5×(Hv_(ave). Hv_(max) is the maximum Vickers hardness of ferrite grains in a region at a distance of from (⅛)t to (¼)t in the thickness direction from the surface when the thickness of the high-strength cold-rolled steel sheet is t, and Hv_(ave) is the average Vickers hardness of ferrite grains in this region.

The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superiorappearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

The n⁺-GaAs layer 8 of the GaAs single crystal 10 is formed by epitaxial growth, followed by epitaxially growing the Si-layer 11 in the same epitaxial growth furnace, and then the aluminum electrode 12 is formed on the Si-layer 11 as an ohmic electrode. The Si-layer 11 can suppress the formation of a surface defect level on the surface of the n⁺-GaAs layer 8 and can effectively prevent the formation of an unnecessary potential barrier. Since the Si-layer 11 has a smooth surface and is excellent in chemical stability, a good ohmic electrode can be obtained by forming the electrode 12 using aluminum or the like has a suitable work function to the Si-layer 11.

The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superior appearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superior appearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.