Maurice Tutor

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About Maurice Tutor

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Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 431 Weeks Ago, 2 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 30 Dec 2017 My Price 6.00

steady-state diffusion flux

5.25   The   steady-state   diffusion   flux   through   a metal  plate  is  7.8 X 10-8   kg/m2-s  at  a  tem- perature  of  1200°C  (1473  K)  and  when  the concentration gradient is -500 kg/m4. Calcu- late the diffusion flux at 1000°C (1273 K) for

 

1473

1673

2.2 X 10-15

4.8 X 10-14

the same concentration gradient and  assum-

ing an activation energy for diffusion of 145,000 J/mol.

 

(a)     Determine the values of D0 and the acti- vation energy Qd.

5.26   At approximately what temperature would a specimen of g-iron have to be carburized for

 

(b) What is the magnitude of D at (1573 K)?

1300°C

4 h to produce the same diffusion result as at 1000°C for 12 h?

 

5.22 The diffusion coefficients for carbon in nickel are given at two temperatures:

 

T(°C)               D(m2/s)

Answers

Maurice Tutor
(5)
Status NEW Posted 30 Dec 2017 10:12 PM My Price 6.00

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