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Lernmaterialien für Materials Technology an der Hochschule Rhein-Waal

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Properties of aluminum
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  • Strong and light
  • Highly corrosive resistant
  • Good conductivity
  • Good reflective qualities
  • Easy to form and process
  • Impermeable and odorless
  • Non-flammable 
  • Good recyclability
  • Specific surface qualities
  • -> ideal for building, transport, printing plate, packaging, foil, etc. 
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What role does Cl play in the production chain of titanium?

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Turning the titanium-oxide (rutil) to gas through carbo-chloration 750-1000 °C resulting in titanium tetrachloride (TiCl4)

(reducing chloration)


[chloride process is used to separate titanium from its ores]

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What is bake hardening?

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Bake hardening is a controlled ageing phenomenon in steel related to the presence of carbon or nitrogen in solid solution. Interstitial solute atoms, such as carbon, move to the dislocations produced during cold working and pin them (anchoring). The driving force for this solute redistribution is to reduce the lattice energy. This leads to immobilization of dislocations and the formation of a so called Cottrell atmosphere.

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Rapid Prototyping can be classified in subtractive, additive and virtual  processes. List 5 different additive processes.

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  • Stereolithography
  • Multi Jet/ Poly Jet modeling
  • Fused deposition modeling
  • Ballistic-particle manufacturin
  • Three-dimensional printing
  • Selective laser sintering
  • Electron beam melting
  • Laminated-object manufacturing
  • Laser-engineered net shaping
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Shape casting vs. format casting
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Shape: casted process without following process
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Explain the process "Cladding" with regard to aluminum

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Between Casting and Preheating another step is added: package building. Reduced thickness of the slab (~450 mm), rolled braze. Cut it to length and place it on the core. In hot rolling process it is kind of welded to the slab.

After the process: 

  • may have to do chemical or thermal degreasing (heat exchanger with brazing furnace)
  • typically slittet
  • packaged
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What is the difference between casting and wrought alloys?

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In wrought casting (worked after casting): Al +

  • Iron
  • Silicon
  • Manganese
  • Magnesium
  • Zinc
  • Copper

In casting:

  • Silicon
  • Magnesium
  • Zinc
  • Copper

can be mixed in many combinations


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Controlled atmosphere brazing is used to produce aluminum heat exchangers. What is the typical delivery form of the used flux and how is it applied to the aluminum parts? 
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TESTE DEIN WISSEN
They are sprayed with a flux suspension
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What is capillary action?
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TESTE DEIN WISSEN
The ability of a liquid to flow in narrow spaces without external forces, but due to intermolecular forces. It diameter is sufficiently small the combination of surface tension and adhesive forces between liquid and container will act to propel the liquid
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List the main manufacturing steps in Al-Extrusion.

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TESTE DEIN WISSEN

1. Alloy

2. Casting
3. Homogenization 
4. Cooling
5. Pre-heating
6. Extrusion
7. Quenching
8. Ageing  

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TESTE DEIN WISSEN

 Name 3 properties of casting alloys which are important for the final product

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  • density
  • corrosion resistance
  • conductivity
  • ductility
  • strength
  • creep resistance
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What is the difference between primary and secondary alloys?

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Primary = “fresh” Aluminium

Secondary = recycled
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Q:
Properties of aluminum
A:
  • Strong and light
  • Highly corrosive resistant
  • Good conductivity
  • Good reflective qualities
  • Easy to form and process
  • Impermeable and odorless
  • Non-flammable 
  • Good recyclability
  • Specific surface qualities
  • -> ideal for building, transport, printing plate, packaging, foil, etc. 
Q:

What role does Cl play in the production chain of titanium?

A:

Turning the titanium-oxide (rutil) to gas through carbo-chloration 750-1000 °C resulting in titanium tetrachloride (TiCl4)

(reducing chloration)


[chloride process is used to separate titanium from its ores]

Q:

What is bake hardening?

A:

Bake hardening is a controlled ageing phenomenon in steel related to the presence of carbon or nitrogen in solid solution. Interstitial solute atoms, such as carbon, move to the dislocations produced during cold working and pin them (anchoring). The driving force for this solute redistribution is to reduce the lattice energy. This leads to immobilization of dislocations and the formation of a so called Cottrell atmosphere.

Q:

Rapid Prototyping can be classified in subtractive, additive and virtual  processes. List 5 different additive processes.

A:
  • Stereolithography
  • Multi Jet/ Poly Jet modeling
  • Fused deposition modeling
  • Ballistic-particle manufacturin
  • Three-dimensional printing
  • Selective laser sintering
  • Electron beam melting
  • Laminated-object manufacturing
  • Laser-engineered net shaping
Q:
Shape casting vs. format casting
A:
Shape: casted process without following process
Mehr Karteikarten anzeigen
Q:

Explain the process "Cladding" with regard to aluminum

A:

Between Casting and Preheating another step is added: package building. Reduced thickness of the slab (~450 mm), rolled braze. Cut it to length and place it on the core. In hot rolling process it is kind of welded to the slab.

After the process: 

  • may have to do chemical or thermal degreasing (heat exchanger with brazing furnace)
  • typically slittet
  • packaged
Q:

What is the difference between casting and wrought alloys?

A:

In wrought casting (worked after casting): Al +

  • Iron
  • Silicon
  • Manganese
  • Magnesium
  • Zinc
  • Copper

In casting:

  • Silicon
  • Magnesium
  • Zinc
  • Copper

can be mixed in many combinations


Q:
Controlled atmosphere brazing is used to produce aluminum heat exchangers. What is the typical delivery form of the used flux and how is it applied to the aluminum parts? 
A:
They are sprayed with a flux suspension
Q:
What is capillary action?
A:
The ability of a liquid to flow in narrow spaces without external forces, but due to intermolecular forces. It diameter is sufficiently small the combination of surface tension and adhesive forces between liquid and container will act to propel the liquid
Q:

List the main manufacturing steps in Al-Extrusion.

A:

1. Alloy

2. Casting
3. Homogenization 
4. Cooling
5. Pre-heating
6. Extrusion
7. Quenching
8. Ageing  

Q:

 Name 3 properties of casting alloys which are important for the final product

A:
  • density
  • corrosion resistance
  • conductivity
  • ductility
  • strength
  • creep resistance
Q:

What is the difference between primary and secondary alloys?

A:

Primary = “fresh” Aluminium

Secondary = recycled
Materials Technology

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