15 Questions
What is the approximate percentage of tin in the alloy?
27-30%
What is the process used to produce the powder?
Melting and atomization
What is the shape of the powder particles produced?
Spherical
What is the percentage of copper in the alloy?
13-30%
What is the purpose of melting the alloy in the manufacturing process?
To produce a liquid alloy
What is the primary purpose of homogenization of the ingot at 400°C?
To improve the mechanical properties and corrosion resistance
What is the typical shape of the powder produced through lathe cutting or ball milling?
Spherical or Spheroidal
What is the purpose of slow cooling the ingot to 480°C?
To form the Ag3Sn intermetallic compound with a non-homogenous, cored structure
What is the alternative to age hardening at 100°C for 1-6 hours?
Storing the powder at room temperature for months
What is the diameter of the mold used in ingot production?
3.8 cm
What is the purpose of homogenization in spherical and spheroidal powders?
To eliminate coring
What is the effect of coring on the microstructure of powders?
It introduces internal stresses in the powder
What is the advantage of eliminating internal stresses in powders?
It improves the microstructure of the powder
What is the outcome of exposing spherical and spheroidal powders to homogenization?
It eliminates coring and internal stresses
What is the primary benefit of homogenization in powder manufacturing?
Uniform powder microstructure
Study Notes
Manufacturing the Alloy Powder
- Ingot production involves molding alloy into a shape 3.8cm in diameter and 20-25cm in length, followed by slow cooling to form Ag3Sn intermetallic compound, which is non-homogenous in nature (cored structure).
- Maximum temperature for slow cooling is 480°C.
Homogenization of the Ingot
- Homogenization involves heating the ingot at 400°C for several hours to improve mechanical properties and corrosion resistance.
Production of the Powder
- Powder production involves cutting the ingot using a lathe or ball milling to produce spherical or spheroidal particles ranging from 4-40μm in size.
Production of Spherical Powder
- Spherical powder is produced by spraying the lathe-cut particles into a closed chamber filled with an inert gas or water.
Age Hardening or Annealing
- Age hardening involves heating the powder at 100°C for 1-6 hours to eliminate internal stresses.
- Alternatively, the powder can be stored at room temperature for months to achieve the same effect.
- Chemical composition of the alloy: Tin (27-30%), Copper (13-30%).
Powder Manufacturing Process
- The powder manufacturing process involves melting and atomization of the liquid alloy to produce spherical powder particles.
- Spherical and spheroidal powders are exposed to homogenization to eliminate coring.
This quiz covers the process of manufacturing alloy powder, including ingot production, homogenization, and powder production. It involves slow cooling, mechanical properties, and corrosion resistance.
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