Bimetal Silver Contact Rivets For Relay
Products Description
These Brimetal Silver Contact Rivets for Relay are made by tightly bonding two dissimilar metals together using a solid-state thermoforming welding process:
Working Face: Made of silver (Ag) or a silver alloy. It acts as a physical barrier for current connection and disconnection, protecting against arc erosion and mechanical wear.
Base Material: Made of high-quality copper (T2/C1100). It provides robust mechanical support, ensures deformation control during riveting, and serves as an efficient heat conduction path.
Whether used as a moving contact in a relay or a stationary contact in a circuit breaker, this bimetallic structure demonstrates a comprehensive advantage that no single material can match.
Production Process Overview
| Material Preparation Stage | Copper wire is drawn and annealed to obtain the specified diameter and mechanical properties; silver alloy wire or powder is smelted, atomized (for oxide dispersion enhancement), isostatically pressed, and sintered to obtain a dense billet. The purity and oxygen content of both materials must be strictly controlled to prevent incomplete soldering due to oxide film obstruction during interface bonding. |
| Interface Bonding Stage | The Agcdo Bimetal Silver Rivet Contacts and copper core are heated in a protective atmosphere or vacuum environment to a temperature below the recrystallization temperature and above the diffusion activation temperature. Axial pressure is applied to ensure tight interface adhesion and maintain the bond for a sufficient time, forming a metallurgical bond. The temperature-pressure-time window for this process must be precisely set according to the material combination and is a core control point in the manufacturing process. |
| Composite Billet Forming Stage | The bonded Silver Cadmium Oxide Agcdo Electrical Contact is formed into a rivet outline using cold or warm heading processes. Mold design must consider the flow differences between the two materials, typically employing a zoned lubrication strategy-a highly lubricating coating is used in the silver layer area to prevent sticking, while medium lubrication is used in the copper layer area to ensure uniform deformation. |
| Heat treatment and stress control stage | The formed composite rivet undergoes stress-relieving annealing. The annealing temperature selection must consider the recrystallization characteristics of both materials, typically using the material with the lower recrystallization temperature (silver alloy) as a benchmark to avoid over-annealing, which can lead to coarsening of the silver layer grains and an "orange peel" surface. |
| Finishing and inspection stage | Centerless grinding or tumbling polishing ensures the rivet diameter accuracy; ultrasonic scanning or metallographic sectioning is used to inspect the interface bonding quality; microhardness testing confirms the width of the interface transition zone and the hardness gradient; finally, contact resistance sampling testing and a full visual inspection are performed. |
Application Advantages: Stable Performance in Multiple Scenarios
Industrial Relays
Handles frequent start-stop cycles under highly inductive loads without sticking or breakdown.
Automotive Electronics
Maintains low Silver Cadmium Electrical Contact voltage drop under vibration and extreme temperature changes, improving the reliability of the entire vehicle's circuitry.
Thermostats and Switches
Precise kinetic response ensures stable opening and closing for hundreds of thousands of cycles.
Detailed Display: Quality Boundaries from a Microscopic Perspective
For professional electrical engineers, the standard for accepting Composite Contact Rivets for Relays is often under a microscope:
Microscopic Presentation of Interface Bonding Rate: After longitudinally slicing the contact and polishing/etching it, under a metallographic microscope, the silver-copper bonding lines should exhibit an interlocking wavy or serrated pattern, without any obvious pores, inclusions, or unbonded "dark bands." This is irrefutable proof of no delamination.
Edge Coverage of the Silver Layer at the Head: In a high-quality composite process, the silver layer will exhibit a smooth and dense covering at the curved edge of the head, with absolutely no "exposed copper" phenomenon caused by inconsistent metal flow. Even the smallest exposed copper point will quickly oxidize and turn black after energization, causing a sharp increase in contact resistance.
Microscopic Cleanliness of the Copper Foot Surface: The surface of the riveted foot is a uniform purplish-red color, without obvious machining marks, scratches, or dents. This surface finish ensures a perfect interference fit between the rivet and the spring hole during automated riveting, achieving optimal contact resistance and thermal conductivity.
contact us
Silver Electrical Contact Rivets for Rocker Switch, with their composite design of silver alloy and copper, achieve a balance between conductivity, arc resistance, and structural strength, making them a core component in highly reliable electrical contact systems. For engineering projects demanding stable performance and long-term reliability, this product offers clear technical and application advantages. For contact selection and structural optimization solutions tailored to your specific application conditions, our engineering team can provide integrated support from material design to process implementation. Please submit your requirements to enter the technical evaluation and inquiry process.
Hot Tags: Bimetal Silver Contact Rivets For Relay, China Bimetal Silver Contact Rivets For Relay manufacturers, suppliers, factory, Silver Contacts For Relay, Flat Silver Trimetal Contacts, Silver Tin Oxide Contact, Composite Contacts, Round Bi Metal Electrical Contact Rivet, Trimetal Silver Contact Rivets
You Might Also Like
Send Inquiry