Table 2. Densities and Porosities of Industrial Shells Used in This Study Bulk Density, g/cm3 1.64
Shell #1 Shell #2 Shell #3 Shell #4 Shell #5 Shell #6 Shell #7
Theoretical density, g/cm3 2.41
1.53 1.63 1.93 2.24 1.98 1.96
-
2.42 2.90 3.30 3.18 3.26
air permeability but also affect the shell’s mechanical and thermal properties. Termal processing history also influences shell thermal
properties. Several thermal stages occur in the investment casting process, including pattern removal/dewaxing, sinter- ing/firing, preheating and pouring. Colloidal silica binder, flour/filler and often ceramic stucco have a significant amor-
Open porosity, % 21.7
25.7 23.0 23.8 21.0 26.1 26.7
Closed porosity, % 10.0
-
9.9 9.7
11.1 11.6 13.1
Total porosity, % 31.7
-
32.9 33.5 32.1 37.7 39.8
չ浇注。硅溶ਇডৈ剂，ূ填料չ普通陶瓷灰泥Ӏ有显 ৈہ晶非生Շ，Јў条چ温ङգЉ֨。构ৈہ晶非ङੋ 。ਈ性热ङד型ր影ѫՊ转晶
。难很ਈ性时हङਈ性热ד型造铸模熔量测֪ेত ऽ熟ҵ浇Иד型ङҢ电热有装֨，法方է逆用采९ू本
Fig. 3. Graphs show (a) specific heat capacity and (b) thermal conductivity values of the shells studied and deter- mined by the improved laser flash method.
50 |
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2016
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84
