MgO-Cr2O3질 내화물의 손상기구

목차

1. 서론

2. 실험방법

3. 결과 및 고찰
3.1 화학분석결과
3.2 X선 회절분석결과

4. 결론

본문내용

board(A), middle : slag line(B), bottom : metal zone(C)
Table 2. Chemical composition of MgO-Cr2O3 brick, A, from hot face to the 50mm
inside.
wt%
Depth
MgO
Cr2O3
Al2O3
SiO2
Fe2O3
CaO
Na2O
TiO2
Surface
27.69
17.52
11.74
0.86
31.56
0.80
0.044
0.13
0∼10mm
50.49
22.29
8.69
0.97
10.75
0.74
0.028
0.096
10∼20mm
50.33
21.15
8.36
1.25
7.30
1.15
0.028
0.087
20∼30mm
50.82
21.77
8.63
1.07
7.40
0.96
0.033
0.087
30∼40mm
48.83
23.35
8.90
1.07
7.93
0.88
0.028
0.092
40∼50mm
49.83
21.30
8.31
0.98
7.18
0.88
0.031
0.083
Unused*
54.0
21.0
14.0
2.0
8.0
1>
* Typical data
Fig.2. Distribution of chemical composition of MgO-Cr2O3 brick, A, from hot face to the 50mm inside.
Table 3. Chemical composition of MgO-Cr2O3 brick, B, from hot face to the 50mm
inside.
wt%
Depth
MgO
Cr2O3
Al2O3
SiO2
Fe2O3
CaO
Na2O
TiO2
Surface
49.95
13.75
6.48
3.43
3.22
6.50
0.019
0.44
0∼10mm
49.54
14.91
7.20
3.28
3.74
6.73
0.017
0.42
10∼20mm
50.91
14.62
5.63
3.33
4.31
5.94
0.021
0.22
20∼30mm
50.33
14.79
4.29
3.33
4.44
5.34
0.021
0.20
30∼40mm
53.48
15.48
3.43
3.25
4.12
3.68
0.026
0.066
40∼50mm
51.86
15.88
3.50
2.56
4.20
3.22
0.032
0.034
Unused*
58.5
24.0
7.5
1.5
7.0**
1.0
* Typical data, ** T-Fe
Fig.3. Distribution of chemical composition of MgO-Cr2O3 brick, B, from hot face to the 50mm inside.
Table 4. Chemical composition of MgO-Cr2O3 brick, C, from hot face to the 50mm
inside.
wt%
Depth
MgO
Cr2O3
Al2O3
SiO2
Fe2O3
CaO
Na2O
TiO2
Surface
31.34
7.44
5.32
12.11
3.13
21.69
0.023
0.86
0∼10mm
34.74
10.44
5.70
10.72
3.81
19.24
0.019
0.79
10∼20mm
51.61
15.26
4.65
3.94
4.70
6.54
0.019
0.26
20∼30mm
52.86
15.28
3.74
3.85
4.38
4.99
0.019
0.20
30∼40mm
52.32
16.81
3.79
2.91
4.64
3.46
0.023
0.066
40∼50mm
53.72
16.84
3.82
2.01
4.56
2.32
0.021
0.042
Unused*
60.0
19.0
9.5
1.5
8.5
1.0
* Typical data
Fig.4. Distribution of chemical composition of MgO-Cr2O3 brick, C, from hot face to the 50mm inside.
Fig.5. XRD patterns of MgO-Cr2O3 direct bonded bricks, 'A' after service at
free board in ladle.
Fig.6. XRD patterns of MgO-Cr2O3 direct bonded brick, 'B' after service at
slag line in ladle.
Fig.7. XRD patterns of MgO-Cr2O3 direct bonded bricks, 'C' after service at
metal zone in ladle.
Fig.8. Macro-structures of MgO-Cr2O3 direct bonded bricks, 'A', 'B', and 'C'
after service at free board in ladle. (bar=1㎜)
Top : surface (hot face), yellow=periclase, black=chrome, brown=MgO with
spinel
Fig.9. Microstructure of MgO-Cr2O3 direct bonded brick, 'A' after service at
free board in ladle.
white grain : chrome, small white grain : (Mg,Fe)(Al,Cr)2O4
Fig.10. Microstructure of MgO-Cr2O3 direct bonded brick, 'B' after service at
slag line in ladle.
white grain : chrome, small white grain : (Mg,Fe)(Al,Cr)2O4
Fig.10a. Microstructure of point '.' in No.3 of Fig.10
white : (Mg,Fe)(Cr,Al)2O4 spinel, grey : CaO·MgO·SiO2
Fig.11. Microstructure of MgO-Cr2O3 direct bonded brick, 'C' after service at
slag line in ladle.
white grain : chrome, small white grain : (Mg,Fe)(Al,Cr)2O4
Fig.12. Schematic diagram of damage in MgO-Cr2O3 brick.

키워드

MgO-Cr203,   내화물의 손상기구,   X선 회절분석결과,   화학분석결과,   X선,   Free board부위