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Biomaterials > Metals > Flashcards

Metals Flashcards

1
Q

CoCr

A

High wear resistance

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2
Q

Polishing

A

Does not interact with bone

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3
Q

Ti

A

Too soft for articulating

Good for bone

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4
Q

General Characteristics

4

A

High corrosion resistance
Biocompatibility
High wear resistance
Mechanical properties

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5
Q

Oxide layer

3

A

Key to biocompatibility
Responsible for corrosion resistance
Assist with osseointegration

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6
Q

Biocompatibility

A

ability to minimize adverse host reactions

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7
Q

High wear resistance

A

Necessary to prevent leechables

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8
Q

Mechanical properties

A

Static and fatigue

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9
Q

Stress-shielding

A

Have elastic modulus equivalent to that of the tissue

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10
Q

Co-based alloy manufacture

A

Casting or powder metallurgy

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11
Q

Ti alloy manufacture

A

machined

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12
Q

Heat treatment

2

A

Heating and chilling at a controlled rate

Increased strength or hardness

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13
Q

Heat treatment types

7

A 
Hardening
Quenching
Annealing
Normalizing
Tempering
Strengthening
Surface Hardening
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14
Q

Hardening

A

Heat and cool rapidly

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15
Q

Quenching

3

A

Cooling rapidly using salt water, water, oil, molten salt, air or gas
Increased residual stresses and sometimes cracks

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16
Q

Annealing

4

A

Heat and cool slowly
Reduces hardness
Removes residual stresses
Improve toughness

17
Q

Normalizing

3

A

Air cooled
Enhanced hardness
Less ductility

18
Q

Tempering

4

A

2nd Heating (lower temp) and cooled slowly
Reduces brittleness
Increased ductility and toughness
Relieves stresses

19
Q

Strengthening

A

Controls grain size

20
Q

Surface Hardening

3

A

Heat/cool or chemical bath
Improves wear resistance
Lower impact resistance and fatigue life

21
Q

What are the most employed biomedical alloys?

A

Ti, CrCo, SS

22
Q

Desired properties of metals for in vivo use

3

A

Wear resistance
Mechanical Properties
Corrosion Resistance

23
Q

What is the function of the oxide layer?

3

A

Repassivates
Anti-corrosion
Increases biocompatibility

24
Q

What are the consequences of accelerate corrosion and metal wear in-vivo?
2

A

Toxicity

Inflammation

Biomaterials (12 decks)

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