摘要:
Metal is evaporated in a container which comprises an electrically conductive ceramic base whose surface in contact with the molten metal is coated with a film comprising, a main component selected from the group consisting of titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, chromium carbide, molybdenum carbide, tungsten carbide, tungsten metal, tantalum metal and molybdenum metal.
摘要:
An evaporation vessel for vacuum evaporation of electroconductive ceramic boat for use in the vacuum evaporation of a metallic or non-metallic substance by virtue of resistance heating, wherein the surface of the adjoining portion on the both sides of a cavity is lower than the top of the outside wall of the cavity.
摘要:
A method for manufacturing a thermionic cathode is provided which comprises cutting a bar from a multi-layer structure having a first layer of thermoelectron emissive compound and a third layer of metal of high melting point, a second layer of reaction barrier being interposed between said first and third layers, the bar being cut in a direction substantially perpendicular to that of the layers, sharpening the end of the first layer of the bar and then providing current terminals with the third layer of the bar. According to the method of the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured.
摘要:
A chlorosilane disproportionation catalyst comprising a tertiary amine of the formula: ##STR1## where each R represents an aliphatic hydrocarbon group and the sum of carbon atoms in the three aliphatic hydrocarbon groups as R is 12 or more, and a tertiary amine hydrochloride of the formula: ##STR2## where R is as defined above.
摘要:
A thermionic emission cathode comprises a cathode tip made of an alkaline earth metal or rare earth metal hexaboride, a metallic support for supporting a base of said cathode tip and a reaction barrier layer comprising colloidal carbon and a reaction barrier material which bonds said cathode tip and said metallic support in one body.
摘要:
A thermionic cathode for an electron beam device is provided which comprises a first layer of thermoelectron emissive compound sharpened towards a point, a third layer of metal of high melting point and a second layer of reaction barrier interposed between the first and third layers, current terminals being attached to said third layer. According to the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured.
摘要:
Method for forming a ceramic circuit board by forming a metal circuit pattern on a ceramic board through an active metal ingredient-containing brazing material and removing an unnecessary part of the brazing material by chemical liquor treatment.
摘要:
A substrate for mounting an electronic component, includes a baseplate having a main surface formed with or without a recess. A ceramic substrate is provided on the main surface of the baseplate and has a smaller size than the baseplate. A metal layer is provided to cover both of the baseplate and the ceramic substrate. The metal layer has a surface remote from the baseplate and the ceramic substrate is made flat, the baseplate is made of a metal-ceramic composite of a metallic material and a ceramic material, and the metallic material in the composite and the metal layer have different compositions. Thus, an integral ceramic circuit board, which is resistant to repeated thermal stress and is superior in reliability can be realized.
摘要:
A metal-ceramics composite comprising a porous inorganic structure and a metal containing aluminum as the main component, infiltrated into the porous inorganic structure, wherein a part of the porous inorganic structure is made of an inorganic fiber and a hardened product of a hydraulic inorganic substance.
摘要:
A substrate for mounting an electronic component, including a baseplate having a main surface formed with or without a recess. A ceramic substrate is provided on the main surface of the baseplate and has a smaller size than the baseplate. A metal layer is provided to cover both of the baseplate and the ceramic substrate. The metal layer has a surface remote from the baseplate and the ceramic substrate is made flat, the baseplate is made of a metal-ceramic composite of a metallic material and a ceramic material, and the metallic material in the composite and the metal layer have different compositions. Thereby, an integral ceramic circuit board, which is resistant to repeated thermal stress and is superior in reliability, can be realized.