Abstract
Powder metallurgical processing of Cr-Cu has advantages over other processes.Vacuum Cirbuit Breakers are well known as vacuum interrupters (VI).The essential properties required for materials used in VI are high electrical conductivity, good skeleton strength and spark erosion resistance.The effect of sintering temperature, compaction pressure and composition on microstructure, sintered density, mechanical properties (tensile strength, hardness) electrical conductivity and skeleton strength of Cu-Cr contacts was investigated.The effect of microstructure on net-shape consolidation and macrostructure evolution during sintering are also detailed.Liquid phase sintering of Cr-Cu alloys resulted in better density without any significant shape distortion.Tensile strength increased with compaction pressure and chromium content.Higher compaction pressure also led to increased bulk hardness.Electrical conductivity increased with increasing compaction pressure and Cu content.
Highlights
Cronium-copper (Cr-Cu) powder metallurgy (P/M) contact materials developed in the past have been widely accepted for medium-voltage, high-cur rent vacuum circuit breakers (VCB) or vacuum interrupters (VI).[1,2,3]
There are two main groups of CrCu contact materials: one is synthesized by powder metallurgy, and the other is by vacuum induction melting (VIM) and casting[2] or surface alloying.[3]
In spite of other processing routes, powder metallurgical pro cessed Cr-Cu contact materials have more than half share of the VI market
Summary
Cronium-copper (Cr-Cu) powder metallurgy (P/M) contact materials developed in the past have been widely accepted for medium-voltage, high-cur rent vacuum circuit breakers (VCB) or vacuum interrupters (VI).[1,2,3] Based on processing, there are two main groups of CrCu contact materials: one is synthesized by powder metallurgy (either by infiltration or sintering), and the other is by vacuum induction melting (VIM) and casting[2] or surface alloying.[3] In spite of other processing routes, powder metallurgical pro cessed Cr-Cu contact materials have more than half share of the VI market. In Cr-Cu, Cu acts as an electric conductor and Cr serves the purpose of giving strength and erosion resistance to the whole material. Cr initiates the breakdown for the circuit because of its low dielectric strength.[1] Microstructure plays an important role during breakdown
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