摘要:
A method for making perforations or forming depressions in a glass work piece is described. Pursuant to the method, a two piece housing for the work piece is provided. The housing when assembled has a cavity conforming in size and shape to the work piece. The lower housing piece has a continuous upper surface and the upper housing piece has a smooth lower surface and openings in the housing piece conforming in size and position to the perforations or depressions desired to be made in the work piece. The work piece is enclosed in the housing and then plugs are inserted in the openings in the upper housing piece. The plugs snugly fit the openings and extend above the upper surface of the upper housing piece. A weight is then disposed on the upper surface of the plugs. The weight may be a flat metal sheet and is of sufficient weight to cause the plugs to exert a pressure of at least about one half pound per square inch on the work piece. The resulting assembly is then subjected to a temperature intermediate the softening point and the working point of the work piece and the temperature is maintained until descent of the plugs into the work piece ceases. The assembly is then cooled to ambient temperature, the work piece is removed from the housing and then the plugs are removed from the work piece.
摘要:
A transport chain for transporting articles along a guideway includes a plurality of interconnected chain parts. The chain parts are provided with a roll body that allows the transport chain to roll along the guideway. The roll body projects through the underside of the respective chain part to rest upon the guideway. The transport chain can also be provided with accumulating rollers that allow the transport chain to continue moving below the transported articles if the articles should reach a temporary standstill.
摘要:
Lead borate and lead zinc borate glasses containing from 0.1 to 10% by weight cuprous oxide (Cu.sub.2 O) and fluoride, the molar ratio of cuprous oxide to fluoride being in the range 1:0.25 to 1:10, preferably in the range 1:1 to 1:5, up to 5% by weight bismuth oxide and from 0.1 to 5.0% alumina are disclosed. These glasses are mixed with particulate lead titanate in amounts up to about 56% by volume. These mixtures have very low coefficients of thermal expansion and are useful for bonding ceramic, glass and metal parts together at low temperatures. They are especially useful as semiconductor package sealants.
摘要:
Lead borate and lead zinc borate glasses containing from 0.1 to 10% by weight cuprous oxide (Cu.sub.2 O) and fluoride, the molar ratio of cuprous oxide to fluoride being in the range 1:0.25 to 1:10, preferably in the range 1:1 to 1:5, and up to 5% by weight bismuth oxide. These glasses may be mixed with particulate refractory fillers in amounts up to about 56% by volume. The sealing glasses are useful for bonding ceramic, glass and metal parts together at low temperatures. They are especially useful as semiconductor package sealants.
摘要:
Sealed semiconductor packages and the like and a method of making them are described. The sealant compositions employed are mixtures of finely divided solder glass and an oxygen containing zinc material. The solder glasses are either lead-boron glasses or lead-zinc-boran glasses in which the zinc-lead mol ratio is below 1:2.
摘要:
Sealing compositions suitable for sealing semi-conductor packages and the like at temperatures below about 450.degree.C. The compositions are mixtures of finely divided solder glass and an oxygen containing zinc material. The solder glasses are either lead-boron glasses or lead-zinc-boron glasses in which the zinc-lead mol ratio is below 1:2.