Method for mfg. ceramic part
A technology of ceramic parts and manufacturing method, applied in the field of ceramic parts and their manufacturing, can solve the problems of difficult repair of defects, excessive stress and strain, deviation of sintering shrinkage characteristics, etc.
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Embodiment 1
[0030] In Example 1, the effect of adding molybdenum oxide to the conductor paste was discussed. Table 1 shows the amount of molybdenum trioxide (average particle size: 2.5 μm) added to the silver powder (average particle size: 4.0 μm) in Table 1, and the results of analysis and evaluation of the ceramic multilayer substrates respectively prepared therefrom.
[0031] Sample No.
MoO 3 Amount added (wt%)
defect type
Substrate resistance value (mΩ)
1*
0
C
1.9
2*
0.05
C
1.9
3
0.1
A
2
4
1.0
A
2.7
5
2.5
A
3.1
6
5.0
A
3.8
7*
6.0
A
6.2
[0032] In the table, * mark represents the comparative example with respect to this invention.
[0033] [Type A] - No defects.
[Type B]—a case where the maximum length ...
Embodiment 2
[0038] In Example 2, the influence of the particle size of the silver powder constituting the conductor paste was examined. As shown in Table 2, using silver powder having an average particle diameter of 2.2 to 10.2 μm, conductive pastes were prepared and evaluated by adding 1.0% by weight of molybdenum trioxide to 100% by weight of the conductive powder.
[0039] Sample No.
MoO 3 amount added
(wt%)
Particle size of silver powder
(μm)
defect type
Substrate resistance value
(mΩ)
8
1.0
3.1
A
2.8
4
1.0
4.0
A
2.7
9
1.0
5.1
A
2.7
10
1.0
7.9
A
2.7
11
1.0
10.2
B
2.6
12
1.0
2.2
B
2.9
[0040] In samples No. 4 and 8 to 10 with a silver powder particle size of 3 μm...
Embodiment 3
[0043] In Example 3, the influence of the rate of temperature increase in the firing treatment step was examined. The paste used was sample No. 4 whose silver powder particle size was 4.0 μm and the amount of molybdenum trioxide added was 1.0% by weight.
[0044] Sample No.
MoO 3 amount added
(wt%)
heating rate
(℃ / h)
defect type
Substrate resistance value
(mΩ)
13
1.0
100
B
2.9
14
1.0
200
A
2.7
4
1.0
400
A
2.7
15
1.0
900
A
2.7
16
1.0
1800
A
2.7
17
1.0
5400
A
2.7
18
1.0
9000
B
2.7
[0045] As shown in Table 3, in samples 4 and 14 to 17 with an average temperature rise rate in the range of 200°C / hour to 5500°C / hour, no defects we...
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