conductive contact is an important part of high-voltage interrupting equipments,and it directly influences the safety operation of equipments.

This article discusses the uniformity and dispersity of the metallography form of sintered powder metallurgyelectrical contacts; analyses the size、blowhole and their distribution, the technical reason of inclusion and othermetallography defects and their improvimg direction.

The coarseness testing appearance can show digitally the surface condition of electric contact.

As silver is very exl1ensive,it is of great economicsignificance to develop the non- silver electric contact materials.

High voltage electric contact as the core component in high voltage switch equipments takes the effect of switch, contacting.

High Precision Peak Value Holding Chip-PKD01 and Its Application in Electric Contacts s Electric Performance Experimental Device;

This paper briefly reviews the technique progress in electrical contact materials and the achievement of silver thrift since the middle of the seventies.

The fluctuation and rise of silver price have produced great impact on the low-voltage electrical contact industry where silver is the main raw material.

W-Cu and copper solid electrical contact materials,which were prepared by axial and radius direction pressing were fabricated by sintering-infiltration method.