POWDER METALLURGY

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• 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.