This document discusses different materials used for electrical purposes. It describes soft and hard solder materials, with soft solder being a tin-lead alloy and hard solder being a copper-zinc alloy. Electrical contact materials are discussed next, noting that successful operation depends on factors like voltage, current, and contact make/break cycles. Commonly used electrical contact materials include pure metals like copper and silver, as well as alloys of silver, copper-tungsten mixtures, and noble metals like platinum, palladium, and tungsten. High resistivity materials and carbon/graphite are also referenced.

1. ELECTRICAL ENGINEERING
MATERIALS: CONDUCTING &
SUPERCONDUCTING MATERIALS
MR. ASIF L. JAMADAR

2. SOLDER MATERIALS
 What is soldering
 Solders used for electrical purpose can be divided into two groups:
1. Soft solders (melting point lower than 400⁰C)
2. Hard solders (melting point higher than 400⁰C)
 Soft solder is an alloy of tin and lead
 Hard solder is an alloy of copper and zinc
 Brazing is a soldering at high temperature 2

3. ELECTRICAL CONTACT MATERIALS
 Mean of term Electrical Contact
 The successful operation of electrical contact is a function of several factors
 The performance and life of contact materials are relate to voltage, current
and make & break of contact
 Circuit breaker contacts
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4.  Commercially available
Electrical Contact Materials:
Pure Metals
 Alloys and Heterogeneous
Mixtures
 Copper
 Silver, Silver Alloys and Silver
Heterogeneous Mixtures
 Silver
 Copper-tungsten Heterogeneous
Mixtures
 Noble Metal Electrical Contacts
 Platinum and its Alloys
 Palladium and its Alloys
 Tungsten
 The electrical contact materials are:

6. HIGH RESISTIVITY MATERIALS
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7. CARBON AND GRAPHITE (CARBON BRUSHES)
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8. THANK
YOU
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