摘要:
A laminate article of manufacture comprising a plurality of ceramic layers interposed by at least one metallic interlayer and which possess superior resistivity to thermal shock induced crack formation.
摘要:
A motor (17a, 17b) opens and closes a shutter turnably mounted so as to open and close a discharge port relevant to a hopper, and generates a torque against a load in a gravity direction of materials dropped from a material supply mechanism to the hopper. A shutter control portion (19a, 19b, . . . 19h) sets a hold current applied to the motor from the start of loading relevant to the shutter caused by the materials to be dropped to a predetermined period, to a first hold current value for applying to the shutter a torque sufficient to bear the shock during charge of the materials. In addition, the control portion sets a hold current applied to the motor from an elapse of the predetermined period after reception of the materials by the hopper to the start of discharging the materials from a discharge port of the hopper, to a second hold current value that is smaller than the first hold current value, the second hold current value applying to the shutter a torque against a force released downwardly under a load in the gravity direction of the materials.
摘要:
The present invention provides a ceramic circuit board comprising: a ceramic substrate and a metal circuit plate bonded to the ceramic substrate through a brazing material layer; wherein the brazing material layer is composed of Al—Si group brazing material and an amount of Si contained in the brazing material is 7 wt % or less. In addition, it is preferable to form a thinned portion, holes, or grooves to outer peripheral portion of the metal circuit plate. According to the above structure of the present invention, there can be provided a ceramic circuit board having both high bonding strength and high heat-cycle resistance, and capable of increasing an operating reliability as electronic device.
摘要:
A metal-ceramic joint assembly in which a brazing alloy is situated between metallic and ceramic members. The metallic member is either an aluminum-containing stainless steel, a high chromium-content ferritic stainless steel or an iron nickel alloy with a corrosion protection coating. The brazing alloy, in turn, is either an Au-based or Ni-based alloy with a brazing temperature in the range of 9500 to 1200° C.
摘要:
A compact, inexpensive self-regulating heater for heating a surface to a prescribed temperature. A first embodiment comprises a PTC ceramic heating element which is conductively bonded directly to heavy copper (or brass) electrodes, which conduct both heat and electricity with low resistance and present a smooth, extended heat transfer surface. At least one of the electrodes (on at least one side of the PTC element) is configured for maximum surface area in contact with the article being heated. The preferred methods of manufacture of this invention result in the electrodes being prestressed in tension while the ceramic element is prestressed in compression at room temperature. Upon heating, during use, these stresses tend to disappear as the electrodes expand. A second embodiment comprises a heater tape constructed of multiple modules which are electrically and mechanically connected with bus wires having a bend therein to facilitate the wires being bent in the side to side direction as well as in the up and down direction so that the heater tape can follow an irregular path. The modules are mounted in a flexible rubber skeleton which is sharply necked down between the modules to allow ease of bending in the side-to-side direction as well as in the up and down direction.
摘要:
A circuit substrate which has a ceramic substrate and an Al circuit comprising Al or an Al alloy bonded to said ceramic substrate via a layer comprising Al and Cu.
摘要:
A ceramic base plate of aluminum nitride ceramics, for example, as a power module board has a metal layer on a surface of the ceramic base plate at a fixing portion at which the ceramic base plate is fixed onto a heat radiating plate. Further, a metal film is provided entirely on the rear surface of the ceramic base plate. An IGBT chip or the like is fixed onto the ceramic base plate with a conductive layer interposed therebetween, to form a power module board. Therefore, it is possible to avoid the generation of cracks when the ceramic base plate is mechanically fixed onto the heat radiating plate without using solder, and heat radiation from the ceramic base plate to the heat radiating plate can be improved.
摘要:
Disclosed are a circuit substrate which comprises a silicon nitride ceramic plate 1 having a thermal conductivity at room temperature of 80 W/mK or more and a metal plate 2 joined to the silicon nitride ceramic plate 1 through a glass layer 3, and a semiconductor device in which the circuit substrate is mounted.
摘要:
The sealing composition contains powders composed, by weight, of 70 to 90% of aluminium, 5 to 25% of silicon, 0 to 5% of silica and 0.1 to 5% of moderating metal, which are dispersed in a vehicle comprising an organic binder dissolved in a solvent and a mineral binder. It is applied to the faces to be assembled of a ceramic part and of a refractory alloy or superalloy part and the whole is heated in order to eliminate said vehicle and form between the two parts a layer of mullite syncrystallized with the ceramic.
摘要:
An integral structure and thermal protection system, particularly designed for hypersonic aerospace vehicles, is comprised of a hard external shell or outer face sheet formed of a ceramic matrix, such as silicon carbide, and a rigid insulator core in the form of foamed ceramic, such as silicon carbide, the outer face sheet being integrally connected to the insulator core. A prime strucutral material, such as an aircraft structural member, is integrally connected as by bonding or brazing to the insulator core, the core being attached to the prime structural material or aircraft structural member by an inner face sheet forming the outer skin of such structural member.