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Yamano Y.,AutoNetworks Technologies Ltd. | Hosokawa T.,AutoNetworks Technologies Ltd. | Hirai H.,AutoNetworks Technologies Ltd. | Ono J.,AutoNetworks Technologies Ltd. | And 6 more authors.
SEI Technical Review | Year: 2011

To reduce the amount of CO2 exhaust, we are required to develop light weight wiring harnesses. Aluminum wiring harness is one of the solutions for weight reduction of automobiles. However, we have to consider some negative points of aluminum wire such as lower conductivity, lower strength, oxide layers generated on a wire surface and galvanic corrosion. To solve these problems we have developed an aluminum alloy for conductor, terminal with unique serrations and anti-corrosion technology. This paper explains each solution in detail. Source


Nishikawa T.,Electronics and Materials RandD Laboratories | Takaki Y.,Electronics and Materials RandD Laboratories | Sanai M.,Electrical Conductor Division | Kitamura S.,Sumitomo Electric Industries | And 2 more authors.
SEI Technical Review | Year: 2010

In recent years we have seen a worldwide increase in the demand for electric conductors which have a large transmission capacity to meet rapidly growing electricity consumption. The use of ZTACIR (Aluminum Conductor Invar Reinforced) can double the capacity of overhead power transmission line without extra infrastructure construction. In particular, aluminum clad invar alloy wire, which is highly resistant to corrosion, reduces transmission loss, and produces less CO2 emissions, is increasingly demanded. The authors have worked to develop a high-strength aluminum clad invar alloy wire by enhancing the durability of the conventional invar alloy wire. The newly developed wire is as strong as steel wire and can therefore be used as the core wire of high voltage overhead transmission line. This paper features the characteristics of the developed invar alloy wire. Source


Toshioka H.,Electronics and Materials RandD Laboratories | Nakatsugi K.,Electronics and Materials RandD Laboratories | Yamamoto M.,Electronics and Materials RandD Laboratories | Shimbara N.,Electronics and Materials RandD Laboratories | Okuda Y.,Electronics and Materials RandD Laboratories
SEI Technical Review | Year: 2011

Anisotropie conductive film (ACF) is a film adhesive with conductive particles dispersed in thermosetting resin, and is mainly used for circuit board connection in the field of liquid crystal displays (LCDs), mobile phones, TVs, etc. High performance LCDs require advanced ACF that is applicable to the connection of circuit boards with narrow pitch electrodes. We have developed a new ACF for the connection of circuit boards using our nickel nano straight-chain-like particle technology. This paper describes the performance of the newly developed ACF. Source


Harano K.,Electronics and Materials RandD Laboratories | Satoh T.,Electronics and Materials RandD Laboratories | Sumiya H.,Electronics and Materials RandD Laboratories | Kukino S.,Sumitomo Electric
SEI Technical Review | Year: 2010

Nano-polycrystalline diamond (NPD) obtained using direct conversion sintering process from graphite under high pressure and high temperature has a very fine texture composed of small diamond grains of several tens of nanometers without any binder materials or secondary phases. For this reason, NPD has significantly high hardness, no cleavage feature and high thermal stability. Because of its superior features, NPD is considered to be highly useful for cutting tools. Here, we describe some mechanical properties and several cutting performances of NPD. The Knoop indentation hardness tests showed NPD has very high hardness especially at high temperature; about 2 times higher than those of single-crystal diamonds (SCD) above 800°C, The data from wear tests using a diamond wheel indicated that the abrasive wear resistance of NPD is equivalent to those of the high wear-resistance directions on SCD, and 10-50 times higher than those of conventional polycrystalline diamond (PCD: sintered diamond with metal binder). The results of cutting tests for various work materials, such as Al-Si alloy, ceramics and cemented carbides, demonstrated that the NPD tool has a significantly higher cutting performance than conventional PCD and SCD tools. These results indicated that NPD has a high potential for wide applications in cutting and new processing fields. Source


Iwayama I.,Electronics and Materials RandD Laboratories | Kuwabara T.,Electronics and Materials RandD Laboratories | Nakai Y.,Electronics and Materials RandD Laboratories | Takaki Y.,Sumitomo Electric Industries | And 2 more authors.
SEI Technical Review | Year: 2013

The need for high-strength aluminum fasteners is growing quickly with the aim of reducing the weight of automobiles. Sumitomo Electric Toyama Co., Ltd. has developed 6056 aluminum alloy wire suitable for these fasteners. Owing to its homogeneous microstructures, the wire achieved a high tensile strength of 420 MPa and yield strength of 375 MPa, as well as a maximum reduction ratio of 85% without surface cracks in a compressive test at room temperature. These features will enable fastener manufacturers to improve their productivity. Source

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