Abstract:
Positive temperature coefficient (PTC) compositions having a reduced negative temperature coefficient effect (NTC) are provided that are achieved without crosslinking the thermoplastic base material. The PTC compositions include a thermoplastic base resin, an electrically conductive filler and particles of a polymeric additive dispersed in the PTC composition.
Abstract:
Selon le procédé; on modifie l'état de la surface du substrat (1) pour obtenir au moins une zone lisse (1a) - (1b) de faible rugosité Ra et au moins une zone (Ic) de rugosité plus élevée Rax; on applique, sur les différentes zones (1a), (1b), (1c), un matériau (2) très conducteur de l'électricité; on raccorde la ou les zones lisses (2a) et (2b) du matériau (2) à une source d'alimentation électrique (3).
Abstract:
A resistive device for use in providing a resistive load to a target under the application of power from a power source is provided, the resistive device being adapted for electrical connection to the power source through a pair of terminal wires. The resistive device includes a thick film material, and the thick film material defines at least one layer of tape. The resistive device can be, by way of example, a heater or a load resistor, and can also include a substrate onto which a layer of dielectric tape is disposed, a resistive layer disposed on the layer of dielectric tape, and a protective layer disposed on the resistive layer.
Abstract:
A post and post mount assembly in a hole in the ground has a socket in the hole, concrete in the annular space between the interior walls of the hole and the exterior of the socket, a post in the socket, a wedge member having a tapered portion filling a gap between the socket and the post.
Abstract:
A polymeric composite comprises a polymeric resin; an electrically conductive filler; and a polycyclic aromatic compound, in an amount effect to increase the electrical conductivity of the polymeric composition relative to the same composition without the polycyclic aromatic compound. The addition of the polycyclic aromatic compound in addition to a conductive filler imparts improved electrical and mechanical properties to the compositions.
Abstract:
An anisotropic conductive compound includes an electrically conducting material suspended in a binder. The electrically conducting material includes nickel coated particles having a coating of silver or gold over the nickel coat and/or gold or silver coated nickel particles. In one embodiment, the binder is formed from the reaction product of a catalyst and a compound comprising an aromatic epoxy resin, a dimer fatty acid diglycidyl ester and oxirane. In another embodiment, the binder is formed from the reaction product of a novalac resin, a catalyst and either a heat polymerized aromatic epoxy resin or a phenoxy modified epoxy novalac resin.
Abstract:
The invention relates to an electronic assembly, in particular, for low power consumption electric switching devices such as low power contactors, time relays or the like. In order to provide protection against input current pulses, an ohmic resistor (6) is provided in the form of a resistive layer that is applied by pressing.
Abstract:
The thermistor unit of a thermistor device is constituted of a mixture sintered body (MM')O3 . AOx of a composite perovskite oxide represented by (MM')O3 and a metal oxide represented by AOx. M in (MM')O3 is at least one element selected from elements in group 2A and those (except for La) in group 3A in the periodic table, and M' at least one element selected from elements in groups 3B, 4A, 5A, 6A, 7A and 8 in the periodic table, and metal oxide AOx uses a high-resistance, heat-resisting metal oxide having a melting point of at least 1300 DEG C and a resistance (1000 DEG C) of AOx simple substance in a thermistor device shape of at least 1000 OMEGA , thereby providing a resistance ranging from 100 OMEGA to 100k OMEGA in a temperature range of room temperature to 1000 DEG C with small temperature variations.