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>> 砂型铸造的种类及介绍
1
1
1.
1
2300500kg
3
4
5
6
2
1001586
1
SiO2Na,k,Ca,FeSiO21700710110SiO2
1500FeOSi02Si02
1400
SiO2(Na20K20)(CaOMgO)Si02Si02NaO7327793K2OSiO2525,
2
573-----
Si02
3----
(fireclay)(bentonite)
4
-
5
3
(vertical wheel sand muller)(horizontalwheel sand mullerspeed muller)(blade mixer)
1t5-10t()
4
1()
2
2
123430~60mm30~50/min80150mm
3
4321150mm800600mm
(10-13Hz3-8mm1.1-3.3Hz30-80mm)(6~7)
30~50%120
0.4MPa0.7MpaCT7~8Ramax=3.2~2.5m200~300/h
4
0.4~0.6MPa30.4~0.6MPa0.1MPa7625800m/s
(1)()
(2)
(3)()
(4)
1
(Sodiumsilicate water glass)(Na20mSi02)(K20nSi02)(Li20mSi02)(mK20Na20nSi02)
,pH11-13Na20mSi02nH20
(1)
Si02Na20MSiO2Na2O()()
NaOHNa20Si02C022
2
PNa2O 62Si02(60)()()132-168gcm335-54
2
pH(=Si-0-Na)-(hydrolysis)()-().(Si-0-Si(siloxanelinkage)(polymcr)(gel)
OH-pH
(1)----
Na20Si02H20(9M=2.03.3p=1217gcm3)()()
(2)
pH10pH
pHN,NpH6.87.1pH3.2-3.910
A)C02
C02
CO2 + H20---- 2H+ + C032-
H+pH
C02Na20Si02$i02
C02C02C02(?)
C02106-7()C02Na2C03NaHC03()
B)
RCOOR+H2O-------RCOOH+ROH
RCOO-Na+H+OH-
(3)
CO241MPa29.8MPa20.5MPa14.9MPa
C020.20.48m0.07-0.18m0.06-0.16m0.035-0.04m
1
1
1.
1
2300500kg
3
4
5
6
2
1001586
1
SiO2Na,k,Ca,FeSiO21700710110SiO2
1500FeOSi02Si02
1400
SiO2(Na20K20)(CaOMgO)Si02Si02NaO7327793K2OSiO2525,
2
573-----
Si02
3----
(fireclay)(bentonite)
4
-
5
3
(vertical wheel sand muller)(horizontalwheel sand mullerspeed muller)(blade mixer)
1t5-10t()
4
1()
2
2
123430~60mm30~50/min80150mm
3
4321150mm800600mm
(10-13Hz3-8mm1.1-3.3Hz30-80mm)(6~7)
30~50%120
0.4MPa0.7MpaCT7~8Ramax=3.2~2.5m200~300/h
4
0.4~0.6MPa30.4~0.6MPa0.1MPa7625800m/s
(1)()
(2)
(3)()
(4)
1
(Sodiumsilicate water glass)(Na20mSi02)(K20nSi02)(Li20mSi02)(mK20Na20nSi02)
,pH11-13Na20mSi02nH20
(1)
Si02Na20MSiO2Na2O()()
NaOHNa20Si02C022
2
PNa2O 62Si02(60)()()132-168gcm335-54
2
pH(=Si-0-Na)-(hydrolysis)()-().(Si-0-Si(siloxanelinkage)(polymcr)(gel)
OH-pH
(1)----
Na20Si02H20(9M=2.03.3p=1217gcm3)()()
(2)
pH10pH
pHN,NpH6.87.1pH3.2-3.910
A)C02
C02
CO2 + H20---- 2H+ + C032-
H+pH
C02Na20Si02$i02
C02C02C02(?)
C02106-7()C02Na2C03NaHC03()
B)
RCOOR+H2O-------RCOOH+ROH
RCOO-Na+H+OH-
(3)
CO241MPa29.8MPa20.5MPa14.9MPa
C020.20.48m0.07-0.18m0.06-0.16m0.035-0.04m
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