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CHEMISTRY > ALLOY, ADHESIVE... > Flashcards

ALLOY, ADHESIVE... Flashcards

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1
Q

is a new technique in which moulds are made using compressed metal powders, even though this method is more expensive (As it involves preparation of metal powder).

A

POWDER METALLURGY

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2
Q

This method has many advantages over the traditional method. Metals and alloy can be made into metal powders. The metal powder is then used for making the articles.

A

POWDER METALLURGY

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3
Q

Powder metallurgy is an art of making metal articles of desired shape using metal powder by __________ AND _____________

A

HEAT TREATMENT AND COMPESSION

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4
Q

Articles can be made by using
3

A

1.Single metal powder
2.Mixture of metal powders
3.Mixture of metal and non-metal powders

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5
Q

Metal powders with particle size ranging from _______Microns are produced. Usually metal powders with particle size ______microns are predominant.

A

1 TO 100
10 TO 20

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6
Q

The powder metallurgical process consist of the the following two steps.

A

1.Powder production
Powder fabrication

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7
Q

2 STEPS Preparation of metal powder

A

ATOMIZATION
REDUCTION OF METAL OXIDE

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8
Q

is suitable for metals with low melting point like zinc, lead, tin, aluminium etc.

A

ATOMISATION METHOD

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9
Q

is suitable for the metals with high melting point like tungsten, iron, copper, nickel etc.

A

REDUCTION OF METAL OXIDE

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10
Q

The melting point of Lead is _________.The melting point of tin is ____c.

A

327
231

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11
Q

IS an alloy of tin and lead

A

SOLDER

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12
Q

Alloys are _________ MIXTURE of two or more metals.

A

homogeneous mixture

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13
Q

are prepared by fusing together the different ingredients (metals) in a furnace.

A

ALLOY

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14
Q

Purpose of alloying

A

1.To increase the hardness of the metal.
2.To increase the tensile strength of the metal.
3.To make it corrosion resistant.
4.To enhance the malleability and ductility.
5.To get attractive surface and appearance.
6.To make it abrasion resistant.
7.The machinability of the metal can be improved.
8.Melting point of the metal can be decreased.
9.The colour and metallic luster can be improved.

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15
Q

2 Types of alloys

A

1.Ferrous alloys
2.Non-ferrous alloys

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16
Q

Alloys which contain containing iron as the main (major) constituent are called as

A

Ferrous alloys

17
Q

EXAMPLE OF FERROUS ALLOYS

A

Stainless steel, chromium steel and vanadium steel.

18
Q
  1. Used for making kitchen utensils.
    2.Used for making surgical instruments
    3.Used for making automobile parts
A

STAINLESS STEEL

19
Q

1.Used for making rock cutting machines
2.Used for making files
3.Used for making ball bearings
4.Used for making connecting rods

A

CHROMIUM STEEL

20
Q

1.Used for making gears and bearings
2.Used for making axles
3.Used for making springs and pistons

A

VANADIUM STEEL

21
Q

Alloys which do not contain containing iron as the main constituent are called as

A

Non-ferrous alloys

22
Q

EXAMPLE OF NON-FERROUS ALLOYS

A

Nichrome, Dutch metal, German silver, gun metal and duralumin

23
Q

1.Used in making resistance coils 2.Used for making heating elements in stoves, electric irons, water heater and toasters

A

NICHROME

24
Q

Used for making cheap jewellery
2.Used for making musical instruments
3.Used for making battery caps
4.Used for making flexible hoses

A

DUTCH METAL

25
Q

Used for making coins
2.Used for making ornaments
3.Used for making decorative materials

A

GERMAN SILVER

25
Q

Used for making bearings
2.Used for making coins
3.Used for making hydraulic Fittings
4.Used in foundry works

A

GUN METAL

26
Q

1.Used in building aircrafts
2.Used for making automobile parts and locomotive parts
3.Used for making surgical instruments
4.Used for making cables

A

DURALUMIN

27
Q

Are a hard substance which is used for cutting, grinding and polishing the surface of other materials.

A

ABRASIVES

28
Q

is the main property of an abrasive

A

HARDNESS

29
Q

Hardness of abrasives is measured in a scale called

A

MOH’S SCALE

30
Q

hardness of abrasives is measured by

A

piercing a needle through it using some pressure

31
Q

The other important property of an abrasive is

A

TOUGHNESS

32
Q

The other important character of an abrasive is its ability to withstand high temperature

A

REFRACTORINESS

33
Q

Abrasives are classified as

A

natural and artificial abrasives

34
Q

also known as carborundum. It is a siliceous artificial abrasives. In hardness, it is almost equivalent to diamond 9.3.

A

Silicon carbide (SiC)

35
Q

also known as norbide. It is also an artificial siliceous abrasives. It is harder than silicon carbide. It’s hardness varies from 9.5 to 9.7 on Moh’s scale.

A

BORON CARBIDE

CHEMISTRY (2 decks)

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