predavanje_5-2011
TRANSCRIPT
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5
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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
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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
,
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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)
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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
. .
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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
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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 () () .
, ;
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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 ( ) ()
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: , . 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 . .
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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 ,
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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.
.
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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
. , .