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Biomaterials > Metals 2 > Flashcards

Metals 2 Flashcards

1
Q

Oxide film

A

Oxidation/reduction reaction

Kinetic factor that control corrosion rate in biological aqueous solutions

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2
Q

Surface treatment reasons

A
  1. Corrosion resistance
  2. Blood compatibility
  3. Strength
  4. Biocompatibility
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3
Q

Blood compatibility

A

Adsorption of proteins
Effect of blood clotting
Gold results in the highest clotting effect

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4
Q

Surface Strength

A

Almost all cracks start at the surface

Done with Ion implantation

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5
Q

Ion Implantation

A

Raise surface strength and increases wear resistance

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6
Q

Surface biocompatibility

A

Deposition of hydroxyapatite (bone) or tricalcium phosphate

Done with plasma spraying

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7
Q

Sintering

A

Making objects from powders by heating the powder material below their melting point until they adhere to one another

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8
Q

Ti properties

A

Light weight
Excellent corrosion resistance
MOST biocompatibility
Soft (low wear and friction properties)

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9
Q

Ti alloys

A

cpTi (4 grades, impuritites)

Ti6Al4V

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10
Q

cpTI

A

More Oxygen equals greater strength

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11
Q

Ti crystallographic forms

A

Alpha (low temp)

Beta (high temp)

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12
Q

Ti alpha alloys

A 
Al, gallium, or tin
NOT heat-treatable
Weldable
Good creep, NO ductile-brittle transform
Low temp applications (not biomedical)
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13
Q

Ti beta alloys

A

Heat treatable and cold formable
Undergoes ductile-brittle transform
NOT suitable for low temp apps
Isomorphous and Eutectoid

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14
Q

Ti alpha-beta alloys

A 
Ti6Al4V
Good formability
Heat treatable
High tensile strength
Not weldable
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15
Q

Reasons to use Stainless steel

A 
Easy to obtain
Inexpensive
Highly Machinable
Low failure rate
NOT interchangeable parts
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16
Q

SS characteristics

A

Iron-based with Cr

17
Q

SS alloys

A

Martensitic
Ferritic
Austenitic
Duplex

18
Q

Martensitic SS

A

Heat treatment
Surgical and dental instruments
Low Cr

19
Q

Ferritic SS

A

NO Heat treatment
Handles for instruments
Low-mid Cr

20
Q

Austenitic SS

A

Med-mid Cr
NO heat treatment
Medical implants and devises
ex. 316L

21
Q

316L SS

A

Cold-worked

Stents, implants, fracter fixers

22
Q

Duplex SS

A

Equally ferrite and austenite

NOT used

23
Q

Cobalt-chromium properties

A

High wear resistance (articulation)
Very dense and heavy
95% of knee implants

24
Q

CoCr Alloys

A

CoCrMo is hardest, strongest and most fatigue resistant for biomedical apps
cold working

25
Q

Nitinol

A

Ni-Ti
Shape memory alloy
Self-expanding stents

26
Q

What is special about 316L SS

A

Low carbon

27
Q

Most used Ti and why?

A

alpha-beta

It is heat treatable, biocompatible and high strength

28
Q

What is the main app of CoCr and what are the challenges?

A

Articulation surfaces

Metal on metal

Biomaterials (12 decks)

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