摘要:
An air bag device for use in front of a passenger seat of an automobile includes a casing disposed in the instrument panel of the automobile, a folded air bag housed in the casing and inflatable through the upper opening upon impact, and a lid openably joined to the casing in covering relationship to the upper opening. An air bag restraint guide or protective cloth is joined to the casing for preventing the air bag from directly contacting an edge of the upper opening when the air bag is inflated through the upper opening.
摘要:
A method of producing a quartz glass crucible by arc melting a quartz powder molded product loaded on the inner side of a mold while performing vacuum suction, includes initiating the melting of quartz powder from the rim edge of a quartz powder molded product, subsequently lowering the arc electrode or raising the mold to heat and melt the sections on the downside of the rim edge. The method is preferably carried out such that the inner surface of the crucible is sealed within a time corresponding to 10% of the total arc time starting from the initiation of arc melting, and the seal thickness is 3 mm or less. The quartz glass crucible thus produced is useful for the pulling up of silicon single crystals and has a uniform glass layer with fewer internal bubbles.
摘要:
A silica glass crucible causing fewer pinholes in silicon single crystals is provided by a method of preventing pinholes by performing the pulling up of a silicon single crystal while restraining the dissolution rate of the crucible inner surface to 20 μm/hr or less, using a silica glass crucible for the pulling up of silicon single crystals, wherein the area of crystalline silica formed by crystallization of amorphous silica is restricted to 10% or less of the crucible inner surface area, or the density of pits formed from open bubbles on the crucible inner surface is restricted to 0.01 to 0.2 counts/mm2.
摘要:
A silica glass crucible including an outer surface layer formed of a bubble-containing silica glass layer and an inner surface layer formed of a silica glass layer whose bubbles are invisible to the naked eye, so as to sufficiently disperse heat from the external radiation thereby preventing temperature irregularity in the silicon melt, and at the same time, exhibit excellent heat conductivity thereby giving a uniformly heated state over a wide range in the entire crucible without taking a long time for increasing the temperature to form a silicon melt, wherein an intermediate layer is interposed between the outer surface layer and the inner surface layer while in the intermediate layer, a bubble-containing silica glass layer (bubble-containing layer) including bubbles with a diameter of 100 μm or smaller by 0.1% or more in the volumetric bubble content and a silica glass layer (transparent glass layer) including the bubbles by 0.05% or less in the volumetric bubble content are laminated.
摘要:
In order to provide method and apparatus for manufacturing a vitreous silica crucible with little mixing of foreign matter and stable arc during arc melting, the method and apparatus for manufacturing a vitreous silica crucible have a device which blows off air from the side of arc electrodes toward a melting space of a mold, and air discharge ports which discharge the air within the heating furnace, and perform forced supply of air into the melting space during melting to make the atmospheric pressure of the melting space higher than the surroundings, and preferably, form an air pressure difference of 100 Pa or more between the melting space and the surroundings, thereby performing melting.
摘要:
A heat treatment apparatus (1) has a treatment chamber 50, arranged adjacent to a heat treatment vessel (2), in which an internal space can be set to contain a prescribed atmosphere, and a conveyor (10) which acts on a holding unit (3), which holds the object of treatment, to cause the object of treatment to move between the heat treatment vessel (2) and the treatment chamber (50).
摘要:
A plane antenna assembly comprises a plurality of antenna bases and a signal composing means including amplifiers each connected to output part of each antenna base for composing respective outputs of the antenna bases amplified through the amplifiers, whereby a composite antenna output is obtained in correspondence to the number of the antenna bases and in an excellent S/N ratio.
摘要:
The purpose of the present invention is to provide a crucible which has high viscosity at high temperature, and can be used for a long time, and can be manufactured at low cost, and a method of manufacturing the same. The composite crucible 10 is characterized in the use of mullite (3Al2O3.2SiO2) as the basic material of the crucible. The composite crucible 10 has the crucible body 11 made of mullite material whose main component is alumina and silica, and a transparent vitreous silica layer 12 formed on the inner surface of the crucible body 11. The thickness of the transparent vitreous silica layer 12 is smaller than that of the crucible body 11. The crucible body 11 can be formed by the slip casting method, and the transparent vitreous silica layer 12 can be formed by the thermal spraying method.
摘要:
The present invention provides a vitreous silica crucible which can suppress the sidewall lowering of the crucible under high temperature during pulling a silicon single crystal, and a method of manufacturing such a vitreous silica crucible. The vitreous silica crucible 10 includes an opaque vitreous silica layer 11 provided on the outer surface side of the crucible and containing numerous bubbles, and a transparent vitreous silica layer 12 provided on the inner surface side. The opaque vitreous silica layer 11 includes a first opaque vitreous silica portion 11a provided on the crucible upper portion, and a second opaque vitreous silica portion 11b provided on the crucible lower portion. The specific gravity of the second opaque vitreous silica portion 11b is 1.7 to 2.1, and the specific gravity of the first opaque vitreous silica portion 11a is 1.4 to 1.8, and smaller than that of the second opaque vitreous silica portion. The particle size distribution of the material silica powder for the first opaque vitreous silica portion 11a is wider than that of the second opaque vitreous silica portion 11b, and the material silica powder for the first opaque vitreous silica portion 11a includes more fine powder than that for the second opaque vitreous silica portion 11b.
摘要:
Provided is an apparatus for manufacturing a vitreous silica crucible which has a structure which can reduce gaps between a partition wall and electrodes inserted into through-holes formed in the partition wall while enabling electrodes to move to adjust a heating temperature of arc discharge. A plate-shaped partition wall 15 is placed above the rotating mold 10. Electrodes 13 for heating and fusing are inserted into through-holes 16 penetrating in a thickness direction, and are directed toward the rotating mold 10. A rocking unit 40 is provided on an upper side of the partition wall 15 and rocks the electrodes 13 around virtual rocking axes P, and the virtual rocking axes P pass through the through-holes 16.