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Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Engineering technology Topic : Sintered metallic materials Prepared by: Ing. Elena Nová. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

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Anglicky v odborn ch p edm tech support of teaching technical subjects in english

Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“

Tutorial: Engineering technology

Topic: Sinteredmetallicmaterials

Prepared by: Ing. Elena Nová

Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

Sintered metallic materials1
Sintered metallic materials

Sintered materials

Are produced from metallic powders steel / copper / tin / aluminum, which are pressed under great power into required shapes and in next process – sintering – are bonded into a new material with very high strength.

Sintered metallic materials2
Sintered metallic materials

  • Advantages of powder metallurgy:

  • Possibility to create complicated shapes (geared wheels, shapes, parts of absorbers etc.)

  • Possibility to make self greasing / benefit of porosity / sliding gears

  • Dimensional accuracy gain by precision tools for pressing and calibration

  • Complete usage of entry material (without waste) High efectivity in manufacturing of large series

Sintered metallic materials3
Sintered metallic materials

  • Disadvantages of sintering technology

  • Great press force is required

  • Press moulds are expensive

  • Size of products is limited due to pressing force and smaller net densening inside large products

  • Shape difficult parts with transversal holes or threads are not possible to press out.

Sintered metallic materials4
Sintered metallic materials

  • Technological process:

  • 1. Production of metal’s powder

  • 2. Mixing of press mixtures to achieve required chemical-physical properties of final product

  • 3. Pressing – pressed powder has geometrical shape of the final product

  • 4. Sintering – is made in an Oven with protective atmosphere at max. temp. 1140 deg.

  • 5. Final operation – depends on product applicability:

  • - calibration - conservation- saturation- honing- machining

Sintered metallic materials5
Sintered metallic materials

  • Powder manufacturing

  • Powders are produced as follows

  • - Physical – milling and crushing, is used mainly for Cu, Fe, Al, Cr, Mn

  • - atomization of liquid metal by air or water mainly for Pb, Zn, Sn, Al, Fe

  • - steam condensation used mainly for Zn, Cd

  • - chemically based on ore reduction is used with Cu, Ag, Fe, Ni, Co, W, Mo, Ti.

Sintered metallic materials6
Sintered metallic materials

  • Powders treatment

  • Mostly by

  • - powder reduction after their manufacture by spraying air

  • - powder drying off after their manufacture by spraying of water

  • - screening and classification of powder according to size of particles

  • - addition of other parts in accordance with production special requirements

  • - grease addition to improve pressing

Sintered metallic materials7
Sintered metallic materials

  • Powder pressing

  • Purpose is to achieve partly compact basic shape of final product before sintering.

  • Pressures therefore move in a range of 200 to2000 Mpa.

  • Strait-forward pressing can be

  • - one sided (pic. a)

  • - both sided (pic. b)

  • - from all sides (pic. c)

Sintered metallic materials8
Sintered metallic materials

  • At rolling - powder from holder entry between rolls, which press and compact it. Product are rods or strips

  • At extrusion through calibrated opening produce semi-products of rod’s shape.

Sintered metallic materials9
Sintered metallic materials

  • Powder Sintering

  • Sintering we understand a heat influencing on semi-product made in previous operation – compacting.

  • Sintering temperature depends on composition of coupled material.

  • In a case of semi-product sintering made from a single material, the chosen temperature is about 80% of its melting temperature.

  • Joining of powder particles is by diffusion.

Sintered metallic materials10
Sintered metallic materials

  • Sintering

  • Due to danger of oxidation is sintering made in protective atmosphere.

  • Calibration

  • Sintered products have satisfactory dimensional accuracy and surface quality. At a very high accuracy requirements a high precision calibration form is used.

Answer the questions
Answer the questions:

  • What is a sintering?

  • What steps are used for manufacturing of sintered products?

  • How accurate are sintered products?

  • Advantages of sintering materials?

  • Disadvantages of sintering materials?

What have these product s in common
What have these products in common?

  • Name!

Pou it literatura
Použitá literatura