Alternative Pressing And Sintering Techniques

1. A part produced by Powder metallurgy is termed as

Sintered part

Cast part

Forging part

A part produced by powder metallurgy is termed as a sintered part. Powder metallurgy is a manufacturing process that involves forming metal powders into desired shapes and then heating them to a temperature below their melting point. During this heating process, the metal powders fuse together, resulting in a solid part with improved strength and dimensional accuracy. This process is known as sintering, and the parts produced through this method are called sintered parts.

Explanation

A part produced by powder metallurgy is termed as a sintered part. Powder metallurgy is a manufacturing process that involves forming metal powders into desired shapes and then heating them to a temperature below their melting point. During this heating process, the metal powders fuse together, resulting in a solid part with improved strength and dimensional accuracy. This process is known as sintering, and the parts produced through this method are called sintered parts.

2. The process used below is

Hot isostatic pressing

Cold isostatic pressing

Spark sintering

Rolling

Hot isostatic pressing is a process used to compress and densify materials at high temperatures and pressures. It involves placing the material in a sealed container and subjecting it to high temperature and pressure from all directions. This process helps in eliminating porosity and improving the mechanical properties of the material. It is commonly used for manufacturing components with complex shapes and high-performance materials such as ceramics, metals, and composites.

Explanation

Hot isostatic pressing is a process used to compress and densify materials at high temperatures and pressures. It involves placing the material in a sealed container and subjecting it to high temperature and pressure from all directions. This process helps in eliminating porosity and improving the mechanical properties of the material. It is commonly used for manufacturing components with complex shapes and high-performance materials such as ceramics, metals, and composites.

3. Which of the following is true about powder injection molding?

Complex shapes having wall thicknesses as small as 5 mm can be molded and then removed easily from the dies

Dimensional tolerances less accurate

Low production rates can be achieved by using multi cavity dies

Powder injection molding is a manufacturing process that allows for the production of complex shapes with small wall thicknesses. The powdered material is injected into a mold and then heated to form a solid part. The ability to mold complex shapes with small wall thicknesses is a key advantage of powder injection molding. Additionally, the statement mentions that the molded parts can be easily removed from the dies, indicating that the process is efficient and effective. However, the statement does not provide any information about dimensional tolerances or production rates.

Explanation

Powder injection molding is a manufacturing process that allows for the production of complex shapes with small wall thicknesses. The powdered material is injected into a mold and then heated to form a solid part. The ability to mold complex shapes with small wall thicknesses is a key advantage of powder injection molding. Additionally, the statement mentions that the molded parts can be easily removed from the dies, indicating that the process is efficient and effective. However, the statement does not provide any information about dimensional tolerances or production rates.

4. What is the advantage isostatic pressing?

Parts with high length-to-diameter ratios have been produced with very uniform density, strength, toughness, and good surface detail.

Capable of handling much smaller parts than those in other compacting processes.

The pressure is uniform from one directions and have die-wall friction

Isostatic pressing has the advantage of producing parts with high length-to-diameter ratios that have very uniform density, strength, toughness, and good surface detail. This means that the parts will have consistent properties and quality throughout, making them reliable and durable. Additionally, isostatic pressing is capable of handling much smaller parts compared to other compacting processes. The uniform pressure from all directions and the presence of die-wall friction contribute to the successful production of such parts.

Explanation

Isostatic pressing has the advantage of producing parts with high length-to-diameter ratios that have very uniform density, strength, toughness, and good surface detail. This means that the parts will have consistent properties and quality throughout, making them reliable and durable. Additionally, isostatic pressing is capable of handling much smaller parts compared to other compacting processes. The uniform pressure from all directions and the presence of die-wall friction contribute to the successful production of such parts.

5. For powder of Aluminium and its alloys, the sintering temperature and time is

370° – 500°C, upto 24 hrs

250° – 350°C, upto 18 hrs

400°-600°C, upto 20 hrs

550° – 700°C, upto 22 hrs

The correct answer is 370° – 500°C, upto 24 hrs. Sintering is a process in which powdered materials are heated below their melting point to cause the particles to bond together. In the case of aluminium and its alloys, the optimal sintering temperature range is between 370° and 500°C. This temperature range allows for the particles to bond and form a solid mass without melting the material. The sintering time of up to 24 hours is necessary to ensure that the particles have enough time to bond and achieve the desired density and strength.

Explanation

The correct answer is 370° – 500°C, upto 24 hrs. Sintering is a process in which powdered materials are heated below their melting point to cause the particles to bond together. In the case of aluminium and its alloys, the optimal sintering temperature range is between 370° and 500°C. This temperature range allows for the particles to bond and form a solid mass without melting the material. The sintering time of up to 24 hours is necessary to ensure that the particles have enough time to bond and achieve the desired density and strength.