Q1: What is Powder Metallurgy?
Ans: Powder metallurgy is a manufacturing process in which metal powders are compressed and heated to form solid metal parts.
Q2: Briefly explain the process of Powder Metallurgy.
Ans: In powder metallurgy, metal powder is first prepared and then pressed into a desired shape.
After that, it is heated (sintered) to form a strong solid product.
Q3: State the uses of Powder Metallurgy.
Ans: Uses of powder metallurgy are:
- ➔ Making gears
- ➔ Bearings
- ➔ Cutting tools
- ➔ Electrical contacts
Q4: Name the powder used in Powder Metallurgy.
Ans: Metal powders used are:
- ➔ Iron powder
- ➔ Copper powder
- ➔ Aluminum powder
- ➔ Nickel powder
Q5: State the methods of preparation of Powder used in Powder Metallurgy.
Ans: Methods of preparation are:
- ➔ Mechanical Pulverisation
- ➔ Atomization
- ➔ Chemical Methods
- ➔ Electrolysis
Q6: What is the Mechanical Pulverisation method?
Ans: Mechanical pulverisation is the process of crushing solid metals into fine powder using machines.
Q7: What is Atomization?
Ans: Atomization is the process of converting molten metal into fine droplets using high-pressure air or water, which solidify into powder.
Q8: What is Hydride or Carbonyle Process?
Ans: In this process, metals react with gases to form compounds, which are then decomposed to produce fine metal powders.
Q9: What is Vapour Condensation?
Ans: Vapour condensation is the process of forming metal powder by condensing metal vapours into solid particles.
Q10: What is Electrolysis?
Ans: Electrolysis is the process of producing metal powder by passing electric current through a solution containing metal ions.
Q11: What is an Electrolyte?
Ans: An electrolyte is a liquid that conducts electricity and contains ions for electrolysis.
Q12: State the properties of Metal Powder.
Ans: Properties of metal powder are:
- ➔ Particle size
- ➔ Shape of particles
- ➔ Density
- ➔ Flowability
- ➔ Purity
Q13: What is Sintering Ability?
Ans: Sintering ability is the property of metal powder to bond together and form a solid mass when heated.
Q14: State the Primary processes of Fabrication Procedures.
Ans: Primary processes are:
- ➔ Mixing of powder
- ➔ Compacting
- ➔ Sintering
Q15: State the Secondary processes of Fabrication Procedures.
Ans: Secondary processes are:
- ➔ Machining
- ➔ Heat treatment
- ➔ Finishing operations
Q16: What is the Briquetting process?
Ans: Briquetting is the process of compressing metal powder into a desired shape using pressure.
Q17: What is the Pre-sintering process?
Ans: Pre-sintering is the process of heating compacted powder at a low temperature before final sintering.
Q18: What is the Infilteration process?
Ans: Infiltration is the process of filling pores in a sintered product with molten metal to increase strength.
Q19: What is the Impregnation process?
Ans: Impregnation is the process of filling pores of a sintered product with oil or resin to improve properties.
Q20: State the uses of Powder Metallurgy Products.
Ans: Uses are:
- ➔ Automobile parts
- ➔ Electrical components
- ➔ Aerospace parts
- ➔ Industrial tools
Q21: State the products of Powder Metallurgy.
Ans: Products are:
- ➔ Bearings
- ➔ Gears
- ➔ Filters
- ➔ Cutting tools
Q22: State the advantages of Powder Metallurgy.
Ans: Advantages are:
- ➔ Minimum material waste
- ➔ High accuracy
- ➔ Good surface finish
- ➔ Mass production possible
Q23: State the disadvantages of Powder Metallurgy.
Ans: Disadvantages are:
- ➔ High cost of equipment
- ➔ Limited size of products
- ➔ Lower strength compared to forged parts
Q24: What is Green Strength in Powder Metallurgy?
Ans: Green strength is the strength of a compacted powder before it is sintered.
Q25: What is Green Compact in Powder Metallurgy?
Ans: Green compact is the pressed powder shape before it undergoes sintering.
Q26: What is the Shotting Process in Powder Metallurgy?
Ans: Shotting process is a method of producing metal powder by dropping molten metal into water to form small particles.
