-
摘要: 使用多组元蜡基粘结剂，通过粉末注射成形工艺，结合溶剂脱脂和热脱脂，成功烧结制备出壁厚为0.7 mm的近净尺寸环形Al2O3–B4C薄壁管。结果表明，当石蜡占粘结剂质量分数45%时，喂料具有较低的黏度和较好的抗弯强度；当固相体积分数为58%时，喂料在保证低黏度的前提下具有良好性能。当烧结温度在1550 ℃至1650 ℃范围内时，芯块相对密度及抗弯强度随温度上升而增高；当烧结温度达到1650 ℃时，芯块的密度及强度有所下降，芯块密度随B4C粒度增大而增大，抗弯强度随粒度增大先增大后减小。Abstract: The annular Al2O3–B4C thin wall tube with the wall thickness of near 0.7 mm was successfully sintered by powder injection molding combined with the solvent degreasing and thermal degreasing, using the multi-component wax-based binder. The results show that, when the paraffin mass fraction is 45%, the feedstock has the lower viscosity and the better bending strength. When the solid phase volume fraction is 58%, the feedstock has the good performance in the premise of low viscosity. When the sintering temperature is in the range of 1550 ℃ to 1650 ℃, the relative density and the bending strength of the pellets increase with the increase of temperature. When the sintering temperature reaches 1650 ℃, the density and strength of the pellets begin to decrease slightly, the density increases with the increase of the B4C particle size, and the bending strength increases first and then decreases with the increase of particle size.
-
Key words:
- annular thin-wall tube pellet /
- powder injection molding /
- alumina /
- boron carbide
-
图 3 喂料黏度与石蜡质量分数关系
Figure 3. Relationship between the feedstock viscosity and the PW mass fraction
图 4 生坯抗弯强度与石蜡质量分数关系
Figure 4. Relationship between the bending strength of green billet and the PW mass fraction
图 5 不同固相体积分数喂料黏度与剪切速率关系
Figure 5. Relationship between the feedstock viscosity with the solid phase in the different volume fraction and the shear rate
图 6 生坯抗弯强度与固相体积分数关系
Figure 6. Relationship between the green billet bending strength the and the volume fraction of solid phase
图 7 Al2O3–B4C芯块相对密度和孔隙度随烧结温度变化
Figure 7. Effect of sintering temperature on the relative density and porosity of the Al2O3–B4C pellets
图 8 Al2O3–B4C芯块抗弯强度随烧结温度变化
Figure 8. Effect of sintering temperature on the bending strength of the Al2O3–B4C pellets
图 9 不同烧结温度下Al2O3–B4C芯块的断面扫面电子显微形貌：（a）1550 ℃；（b）1600 ℃；（c）1650 ℃；（d）1700 ℃
Figure 9. Fracture surface SEM images of the Al2O3–B4C pellets at different sintering temperatures: (a) 1550 ℃; (b) 1600 ℃; (c) 1650 ℃; (d) 1700 ℃
图 10 不同烧结温度下Al2O3–B4C芯块的X射线衍射图谱
Figure 10. XRD patterns of the Al2O3–B4C pellets at different sintering temperatures
图 11 1700℃烧结Al2O3–B4C芯块断面能谱面扫描：（a）B、C、Al、O；（b）B
Figure 11. Fracture surface EDS images of the Al2O3–B4C pellets sintered at 1700 ℃: (a) B、C、Al、O; (b) B
图 12 环形Al2O3–B4C生坯及烧结芯块
Figure 12. Annular Al2O3–B4C green billets and sintered pellets
图 13 B4C粒径对Al2O3–B4C芯块烧结密度和孔隙度的影响
Figure 13. Effect of B4C particle diameter on the relative density and porosity of the Al2O3–B4C pellets
图 14 添加不同粒径B4C的Al2O3–B4C芯块烧结后断面扫描电子显微形貌：（a）0.5 μm；（b）5.0 μm；（c）20.0 μm；（d）40.0 μm
Figure 14. Fracture surface SEM images of the Al2O3–B4C pellets with the different B4C particle diameters: (a) 0.5 μm; (b) 5.0 μm; (c) 20.0 μm; (d) 40.0 μm
-
[1] Choe J, Shin H C, Lee D. New burnable absorber for long-cycle low boron operation of PWRs. Ann Nucl Energy, 2016, 88: 272 doi: 10.1016/j.anucene.2015.11.011 [2] Huang J H, Xing H, Cheng P D. Characteristics of some new type burnable poison and its application prospect in China. Atom Energy Sci Technol, 1998, 32(1): 90黄锦华, 邢辉, 程平东. 几种新型可燃毒物的特性以及在我国的应用前景. 原子能科学技术, 1998, 32(1): 90 [3] O’ Leary P M, Pitts M L. Effects of burnable absorbers on PWR spent nuclear fuel // Office of Scientific & Technical Information Technical Reports. Nevada: Yucca Mountain Project, 2000 [4] Xie M L, Chen Y Q, Yu L, et al. Analysis of burnup characteristics of IFBA/WABA burnable poison element, Nucl Sci Eng, 2016, 36(3): 404谢明亮, 陈玉清, 于雷, 等. IFBA/WABA可燃毒物元件的燃耗特性分析. 核科学与工程, 2016, 36(3): 404 [5] Radford K C. Neutron Absorber Pellets with Modified Microstructure: United States Patent, 4474728. 1984-10-02 [6] Huang H W, Wang X M, Yang J, et al. Preparation of Al2O3/B4C burnable poison pellet by aqueous gelcasting. J Mater Sci Eng, 2010, 28(6): 862 [7] Gonzalez-Julian J, Classen L, Bram M, et al. Near net shaping of monolithic and composite MAX phases by injection molding. J Am Ceram Soc, 2016, 99: 3210 doi: 10.1111/jace.14466 [8] Qin M L, Lu H F, Wu H Y, et al, Powder injection molding of complex-shaped aluminium nitride ceramic with high thermal conductivity. J Eur Ceram Soc, 2019, 39(4): 952 [9] Han J S, Gal C W, Kim J H, et al. Fabrication of high-aspect-ratio micro piezoelectric array by powder injection molding. Ceram Int, 2016, 42(8): 9475 doi: 10.1016/j.ceramint.2016.03.011 [10] Wu Q P, Luo Z, Deng Z H, et al, Fabrication of diamond whiskers by powder injection molding. Int J Refract Met Hard Mater, 2018, 74: 114 [11] Park J M, Han J S, Gal C W, et al. Fabrication of micro-sized piezoelectric structure using powder injection molding with separated mold system. Ceram Int, 2018, 44(11): 12709 doi: 10.1016/j.ceramint.2018.04.073 [12] De Freitas Daudt N, Bram M, Barbosa A P C, et al. Manufacturing of highly porous titanium by metal injection molding in combination with plasma treatment. J Mater Proc Technol, 2017, 239: 202 doi: 10.1016/j.jmatprotec.2016.08.022 [13] Liu C, Kong X J, Wu S W, et al. Research on powder injection molding of Ti6Al4V alloys for biomedical application. Powder Metall Technol, 2018, 36(3): 217刘超, 孔祥吉, 吴胜文, 等. 生物医用Ti6Al4V合金粉末注射成形工艺研究. 粉末冶金技术, 2018, 36(3): 217 [14] Jiang X C. Application of ultrafine metal powder injection moulding on tungsten components in fusion devices. Powder Metall Technol, 2018, 36(4): 279蒋香草. 超细金属粉末注射成形在聚变装置钨零部件中的应用. 粉末冶金技术, 2018, 36(4): 279 [15] Huang H W, Wang X M, Yang J, et al. Research on the sintering property of Al2O3/B4C pellet. Powder Metall Technol, 2011, 29(3): 190黄华伟, 王晓敏, 杨静, 等. Al2O3/B4C复合材料性能的研究. 粉末冶金技术, 2011, 29(3): 190 [16] Liu Y H, Yin S, Zhang W J, et al. Thermodynamic analysis of the self-propagation high-temperature synthesis Al2O3/B4C composite. Scr Mater, 1998, 39: 1237 doi: 10.1016/S1359-6462(98)00304-2 [17] Huang D S, Wu Y C. Sintering behavior of B4C–dispersed Al2O3 pellet. J Cent South Inst Miner Metall, 1989, 20(1): 59黄栋生, 吴义成. Al2O3–B4C弥散芯块材料的烧结行为. 中南矿冶学院学报, 1989, 20(1): 59 [18] Radford K C, Carlson W C. Burnable Neutron Absorbers: United States Patent, 4826230. 1989-05-02 [19] Radford K C. Sintering Al2O3–B4C ceramics. J Mater Sci, 1983, 18: 669 doi: 10.1007/BF00745564 -
下载:
点击查看大图
计量
- 文章访问数: 331
- HTML全文浏览量: 312
- PDF下载量: 113
- 被引次数: 0
