Abstract:
A ceramic circuit card (10) for a missile utilizing a "rivet" design and a method for making the same wherein thick-film copper I/O pads (15) are fabricated on a first dielectric layer (13) and on the upper surface of conducting material (20) in vias (14) formed in the dielectric layer (13). A first conductor layer (11) is printed directly on an alumina ceramic layer (12). The dielectric layer (13) is then printed on the first conductor layer (11) and on the alumina ceramic layer (12). During operation, each I/O pad (15) has attached to it a flex harness (21) for connecting the card (10) to a printed wiring board (22) on which the card (10) is mounted. The ceramic circuit card (10) is further comprised of additional dielectric and conductor layers in an alternating stacked arrangement. The top conductor layer is used to connect the circuit card to other electrical components.
Abstract:
Disclosed is a refractory covercoat composition useful in making two-sided circuitries. The refractory composition contains glass frit, and an inorganic binder including at least one selected from the group consisting of ZrO.sub.2, Al.sub.2 O.sub.3, SiO.sub.2, BaO, CaO, MgO and La.sub.2 O.sub.3. The refractory covercoat has an elevated softening point so that the covercoat protects a printed conductor circuit from damage due to contact with a firing furnace conveyor belt.
Abstract translation:公开了用于制造双面电路的耐火涂层组合物。 耐火材料组合物含有玻璃料,以及包含选自ZrO 2,Al 2 O 3,SiO 2,BaO,CaO,MgO和La 2 O 3中的至少一种的无机粘合剂。 耐火覆盖层具有升高的软化点,使得覆盖层保护印刷导体电路免受与烧制炉输送带接触的损坏。
Abstract:
A novel devitrifying glass comprising, in weight percent, from 5-15% of zinc oxide, from 10-18% of magnesium oxide; from 15-20% of calcium oxide; from 6-14% of barium oxide; from 15-20% of aluminum oxide and from 30-40% of silicon dioxide. The glasses are thermally matched to alumina substrates. The glasses form overglaze thick film inks when admixed with an organic vehicle that are useful as protective coatings for alumina substrates and multilayer printed circuits.
Abstract:
The invention relates to a thick-film circuit arrangement having an electronic circuit which is constructed on a surface (17) of a ceramic substrate plate (3) and which consists of conductor paths (5), resistors, capacitors and components, in particular integrated switching circuits without a housing, formed according to thick-film technique. This structure has between the electrically conductive structures (5) a sintered, nonconductive paste substantially filling the intermediate spaces between them and both the structures and the interposed pastes are covered by a sintered insulating paste. For concealing the thick-film circuit arrangement from unauthorized access, the following covering construction is carried out:1. the paste in the intermediate spaces fills the same between the electrically active thick-film conductor structures in such a manner that the tops of the electrically active structures and the insulating filling layer (7) formed from an insulating paste and filling the intermediate spaces between them are situated substantially in one plane, and2. the insulating paste is provided over the combined conductor/filling layer (11) in a covering and smoothing manner to form at least one insulating first thick-film anti-access layer (13) which, by additional observation-impeding inclusions (dyes, particles) impedes an optical recognition of the underlying structures, especially when the first thick-film anti-access layer or layers is or are not succeeded by further anti-access layers.
Abstract:
A method for inhibiting the formation of blisters during the firing of intermediate layers of fired multilayer electronic components comprising the sequential steps of:(1) applying to a substrate a first and second layer of finely divided particles of dielectric solids and glass dispersed in organic medium; and(2) firing the layers to effect volatilization of the organic medium therefrom, liquid phase sintering of the glass components and densification of both layers, the softening point of the glass, the particle size of the glass and the ratio of glass to dielectric solids in both layers being adjusted in such manner that when the layers are fired, the first layer is porous and the second layer is nonporous.
Abstract:
A process for forming a high density solder pad and fan-out metallurgy system in a ceramic substrate wherein a pattern of indented lines is formed in the surface of a green ceramic substrate, the lines filled with a conductive metal paste, a layer of dielectric green ceramic material deposited over at least a portion of the area of the pattern of indented lines, and sintering the resultant substrate.
Abstract:
A method for sintering thick-film oxidizable silk-screened circuitry comprising printing a glass land surrounding the microcircuit, thereby forming a bridge, on the substrate and covering the same with a glass plate in a non-oxidizing atmosphere, and sintering the same is disclosed.
Abstract:
BY THE ADDITION OF THE REQUISITE AMOUNT OF A POWDERED CERAMIC TO A GLASS COMPOSITION ADAPTED FOR PRINTING UPON A SELECTED PORTION OF A CONDUCTOR WITHIN A MICROELECTRONIC COMPONENT, THE PRINTED GLASS COMPOSITION, WHEN FIRED, IS FOUND TO FORM AN EXCELLENT SOLDER STOP (I.E. MASK) IN THAT ITS FLOW PROPERTIES AT ITS "FIRING TEMPERATURE" ARE SUFFICIENTLY RETARDED FOR GOOD EDGE RESOLUTION DESPITE MULTIPLE REFIRINGS THAT MAY OCCUR DURING THE FORMULATION OF THE ENTIRE MICROELECTRONIC COMPONENT.