CACAT PENGECORAN AKIBAT KELARUTAN HIDROGEN DI DALAM AL CAIR
Gas Hydrogen sangat mudah larut di dalam logam Al cair, tetapi tidak larut dalam AL padat. Jadi selama solidifikasi ( AL cair membeku menjadi fasa padat), gas hidrogen yang awalnya larut menjadi tidak larut ke fasa padat, dan membentuk gelembung gas yang lepas di dalam fasa padat. Gas H2 yang lepas di dalam hasil coran mengakibatkan cacat coran, berupa lubang2 merata diseluruh coran membentuk lingkarang yang berdiameter antara 0.01 mm sd 1.5 mm.
Gas Hydrogen ini berasal dari uap air yang berada di udara terbuka yang kontak langsung dengan permukaan AL cair. Semakin tinggi temperatur kelarutan gas H2 juga semakin tinggi di dalam leburan Aluminium.
Berikut adalah kelarutan Hydrogen di dalam leburan aluminium pada berbagai temperatur
HYDROGEN SOLUBILITY IN ALUMINIUM
AT VARIOUS TEMPERATURE
Measured at pressure at one atmosphere
and at temperature of 68 F (20 C)
Measured at pressure at one atmosphere
and at temperature of 68 F (20 C)
Temp.( C )
|
Temp. ( F )
|
Hydrogen Solubility (cc/100gram)
|
0
|
32
|
0.0000001
|
400
|
752
|
0.005
|
660 Solid
|
1220
|
0.036
|
660 Liquid
|
1220
|
0.69
|
700
|
1292
|
0.92
|
750
|
1382
|
1.23
|
800
|
1472
|
1.67
|
850
|
1562
|
2.15
|
Untuk mengatasi cacat pengecoran yang diakibatkan oleh larut dan terjebaknya gas H2 dalam leburan aluminium tersebut, kami menyediakan bahan degasser padat yang terbukti secara effective mampu kandungan gas H2 yang terjebak di dalam aluminium melalui produk kami Degasser 800 HS
DEGASSER 850 HS
PRODUCT DESCRIPTION
DEGASSER 850 HS is degassing tablet for aluminium
DEGASSER 850 HS is made for degassing of aluminium alloys except LM5 and LM10
APPLICATION : Manual with bell Plunger
REACTION TEMPERATUR : > 650 deg C
STANDARD APLICATION RATE : 150 – 300 gms/100 kg melt
APPEARANCE : Red coloured tablet
DEGASSER 850 HS
PRODUCT DESCRIPTION
DEGASSER 850 HS is degassing tablet for aluminium
DEGASSER 850 HS is made for degassing of aluminium alloys except LM5 and LM10
APPLICATION : Manual with bell Plunger
REACTION TEMPERATUR : > 650 deg C
STANDARD APLICATION RATE : 150 – 300 gms/100 kg melt
APPEARANCE : Red coloured tablet
PACKING : 125 – 130 gms tablets wrapped in a plastics and packed in
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