5.5 Phase diagrams of three-component systems ---ternary phase diagrams
1, 4f Φ
1Φ 3* f
1Φ 2** f
3, F 3 2C Φ
( )T or ( )P
( )T,P
1''' cbacba
a'b'c'
O, content point
Content of A in the system
Content of B in the system
Content of A in the system
Mass fraction
'
'
''
''
b
c
b
c
5.5.1 Composition characters for equilateral triangle coordinates
d,e,f the mass fractions of A are equal
Points on AD line,
On line AD, D’ is closer to A than D, the mass fraction of A in D’ is more than that in D
A BAS bSm m
S b
Sb
The mass fraction of A decrease, mA of A is separated from S (Φ=2, L+A)
mA of A is added into the system
5.5.2 Partly miscible three-components liquid system
a1-a4,
b1-b4,
a1-b1, a2-b2,a3-b3….. conjugate solution
O:isothermal consolute point
aob:binoal curve
Two couples of partly miscible components
Vinyl cyanide(A)
water(B)
ethanol(C)
Two-phase
Single phase
There are three couples of partly miscible components
Vinyl cyanide(A)
water(B)
ether(C)
Single phase
Two-phase
5.5.3 Ternary water-salts systems
Φ=1 L
Φ=2 B(s), L Φ=2
C(s), L
Φ=3, B(s), C(s), FΦ=3, the saturation solution of B and C
Pb-Sn-Bi trinary system
1 2 3 , , E E E
Φ=1, L
Φ=2, L+Pb
Φ=2, L+Sn
Φ=2, L+Bi
Triple point
Bi/Sn, Sn/Pb, Pb/Bi
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