7/25/2019 predavanje_5-2011

1/12

M 1

5

7/25/2019 predavanje_5-2011

2/12

M 1

6.M

(, ) . M , , , . O

. D , . O

, , , , , . P ,

; ,

.

F ,

, . O 6.1. N 6.1.

C N. 100%. N 6.1. C N

, 6.1. C N

.

N 6.2 C N . P . A (C)

(N) . N ( ) , , , . N 6.2. , 6.2.

( 100%)

0%.

C N

C N

0

100

)

)

)

6.1 () C () C

( ) ( ) , ()

6.2 () C () C () ( ) , ()G

7/25/2019 predavanje_5-2011

3/12

M 1

6.1.

A

. ,

. D ()

: (1) , (2)

. O . N . B .

6.1.1.

. K

, .K , ,

. N . O

, (S. 6.3). K .

6.3

6.1.2.

O . O . O H2, N2 O2 . . I

. P

. (S.6.3)

6.4

. M

F .O F.

6.1.3.

K , . O

,

7/25/2019 predavanje_5-2011

4/12

M 1

. M

, .

6.2.

D .

. B

(J). D ( ) M , .

MJ

A t=

(6.1)

A , 2

,

J , /2, / 2

M /

dMJA dt

=

(6.2)

A , 1. P ( )

. O 6.4.

D .

K , C, , , ; , 6.5:

=dC

koncentracioni gradijentdx

K :

( )

( )

= =

B

A B

C CCkoncentracioni gradijent

x x x (6.3)

6.5 () , () ()

M ()

:

=

dCJ D

dx(F ) (6.4)

7/25/2019 predavanje_5-2011

5/12

M 1

K , D, , (2/). N

.

P .

; .

P H2. (H2)

J H2 H2, O2, N2.. G H2 H2 .

6.2.1.

6.2.1.1

, D,

(T 6.1). N , D, .

I D 900C (F)

(BCC) (FCC).

6.1

A

A

D0(2/)

E Q I

J/ / T(C) D (2/)

FF

(CK)2,8104 251 260

500

900

3,01021

1,81015

FF

(PCK)5,0105 284 294

900

1100

1,11017

7,81016

C F 6,2107 80 0,83500

900

2,41012

1,71010

C F 2,3105 148 1,53900

1100

5,91012

5,31011

C C 7,8105 211 2,19 500 4,21019

C 2,4105 189 1,96 500 4,01018

A A 2,3104 144 1,49 500 4,21014

C A 6,5105 136 1,41 500 4,11014

M A 1,2104 131 1,35 500 1,91013

C N 2,7105 256 2,65 500 1,31022

D : 500C

(F), , F (D=3.010212/ ) (C), F (D= 2,410122/).

6.2.1.2

T D. N D F

F 500C 900C 31021 1,81015 2/. D :

=

dQ

RTo

D D e (6.5)

D T (2/)

Q (J/, /)

R , 8,31 J/KT , K

E

. .

7/25/2019 predavanje_5-2011

6/12

M 1

7.

P : . P . N , . ,

. R

,

, .P , , 1930 . P

.

7.1.

P , , , , 5.1.

7.1 , , ,

A , ,

. A

, , , .

M, 1 2 4; 1

2 4. T

4 2. O 7.1.,

, . O . A

1 4 ,

. T .

D 7.1. O . K .

,

, , . K ( ) . O

. N

. , 7.1. A

.

, .

D . I

. N

7/25/2019 predavanje_5-2011

7/12

M 1

7.2. N . P , , ; ,, . A , .O .

7.2 . () A. () A

B; B . () F .

K , , . M

, . 7.3.

K 7.3.;

. K

. M, , S 7.3.

7.3 F () () .

, ;

7/25/2019 predavanje_5-2011

8/12

M 1

K , 7.4. G

.

I . K

, . K

, .

7.4

: ( ), . . G . 3 2. , 1032 . , 10910102. 105106 2. 102 1042.

7.2.

( )

:

, ,

.

: K ( 5%) , . N ,

, S. 7.5, .

.

O

. .

A . N

, .

7.5 ( ) ()

7/25/2019 predavanje_5-2011

9/12

M 1

: , . P , .

N :

,

,

, .

S .

O

. T (, , )

. K 10102.

7.2.1.

D ,

. N .

K ,

. N 5.6 , 5.6 . N 5.6 . T ( C)

(T) . N 5.6

( C T ). . I , ,

,

, 5.6. T . T , .

7.6 () D , , . () . )

7.2.2.

P . O , . T

, . .S . .

7/25/2019 predavanje_5-2011

10/12

M 1

K .

M PCK ( ) CK ( )

( 12). , . G , 7.1.

7.1.

M R P B

P

C, A, N, A, A 111 110 12

F, , M 110 111 12

F, 211 111 12

F, K 321 111 24

H

C, , M, T, B 0001 1120 3

T, M, 1010 1120 3

T, M 1011 1120 6

7.2.3.

P . K

. T

. N

( ). O ( )

. O , .P , 7.7. N , , S.7.7.K FII= F , B=A/ (A , 7.7). N , R, :

coscos

cos/

cos===

A

F

B

FR (7.1)

=F/A .

7.7 G ,

7/25/2019 predavanje_5-2011

11/12

M 1

N

.

. N

( )max ax1

( ) sin 22

=R (7.2)

O ,; ( ). M

, (R)=. T . N

, .

= =

(7.3)

2 =45. ,

, . D ,

=45.. T

=

(7.4)

K , 7.8.,

.

S . N

( ), S. 7.9.

7.8

7.9

S . K PCK CK

. K HGP

, , (=90 ) (=90), 0.

.

7/25/2019 predavanje_5-2011

12/12

M 1

7.2.4.

D

. G . S , . P

,

.

, . K . O

C , S. 7.10. L .

7.10 C , .

.

. N 7.11. P ,

.

K . P , .

D . P

.D ,

. O ,

.

7.11 . () , () D

P . K

, . N

. O . D

. , .