Strong Adhesion Strength Research Articles

衝撃 線爆溶射に関する基礎的研究 溶射皮膜層に及ぼす放電特性の影響

This paper extensively studies the effects of discharging condition on properties of sprayed coating by wire explosion. Charging energy and condenser capacity are ranged from 185J to 415J and 144μF to 280μF, respectively; small condensor capacity corresponds to large circuit frequency. Large charging energy as well as small condensor capacity result in small size and larger velocity of flying particles. It is shown that the particle size distribution is mainly dominated by charging energy. Flying particles with small diameter and large velocity give fine sprayed coating surface. The optimal combination of size distribution and velocity of flying particles, however, is necessary to increase mass of deposits and to obtain strong adhesion strength with the substrate. It is found that adhesion strength between substrate and sprayed coating is mainly dominated by mechanical bonding, i.e., anchoring effect.

Effect of polyethylene powder impregnated with solvents on adhesion between two polyethylene moldings

The effect of LDPE, LLDPE and HDPE powders impregnated with solvents, such as decalin, tetralin and o-dichlorobenzene, on adhesion between two HDPE moldings has been investigated. With the HDPE powder impregnated with solvent no measurable adhesive strength was obtained. However, the LDPE and LLDPE powders impregnated with the solvent showed adhesive effect when heated at temperatures over 80°C for 2 h. The adhesive strength increased as the heating temperatures were raised. It became apparent that the adhesive strength depended on the quantity of the added solvent, and that the optimum quantities of the solvent to be added were the maximum impregnate quantities, that is, the maximum amount of the solvents that could be held in the polyethylene powders. The adhesive strength depended on the type of polyethylene. The LDPE powder impregnated with decalin showed a stronger adhesive strength. When the LDPE powder impregnated with decalin was heated to 100°C, it showed such a strong joint strength (over about ...

PLZT optical shutter with copper electrodes by electroless plating

Abstract The interdigital pattern electrode was produced on the PLZT ceramics by the combination of the photo-lithography method and the electroless plating method. The process and the characteristics of the plating electrode, and the characteristics of the PLZT optical shutter with plating electrode were discussed. The plating electrode had strong adhesion strength, low resistance and good aging characteristic. The optical PLZT shutter with Cu plating electrode has 190 V in the half-wave voltage.

Adhesive effect of high density polyethylene gels on polyethylene moldings

Adhesive effect of polyethylene moldings by use of high density polyethylene gels in organic solvents such as decalin, tetralin, ando-dichlorobenzene was investigated by shearing tests, electron microscope, and DSC measurements. All of the gels showed such a strong adhesive strength over 36 kg/cm2 that polyethylene plates of 3 mm in thickness gave rise to necking sufficient for practical use, when heated at 120 °C for 2 h. In particular, the gel in tetralin showed a strong adhesive strength when heated at 110 °C. It was found that adhesive strength increases with the heating temperature; the temperatures at which adhesive strength begins to increase differ depending on the type of polyethylene sample and solvent. It is apparent that polyethylene gels exhibit an adhesive effect when they are heated at higher temperatures than the gel melting temperatures, and that the closer the SP values of solvents used for the gelation are to the molded polyethylene, the stronger the adhesion of the polyethylene molding.

Properties of PLZT Shutter with Copper Plating Electrodes

The interdigital pattern electrode was produced on the PLZT ceramics by the combination of the photo-lithography method and the electroless plating method. The process and the characteristics of the plating electrode, and the characteristic of the PLZT optical shutter with plating electrode were discussed. The plating electrode had strong adhesion strength, low resistance and good aging characteristic. The optical PLZT shutter with Cu plating electrode was 3.8×10-16 m2/V2 in the secondary electro-optic coefficient and 190 V in the half-wave voltage.