常用的机械混合法很难将尼龙12和金属粉末材料混合均匀,容易出现偏聚,因而会造成选择性激光烧结(SLS)成形件中存在局部强度弱点、翘曲等缺陷.为此,提出了通过溶液沉淀法制备SLS成形用尼龙12覆膜铝粉,利用扫描电镜观察了尼龙12覆膜铝粉及烧结件断口的微观形貌,研究了铝粉含量及粒径对SLS成形件性能的影响.结果表明:尼龙12均匀地包覆在铝粉表面,无裸露铝粉颗粒存在,表明成功制备得到了尼龙12覆膜铝粉材料;当铝粉含量从0增大到50%时,烧结件的热变形温度、拉伸强度、弯曲强度、弯曲模量及硬度比纯尼龙烧结件分别提高了87℃、10.4%、62.1%、122.3%及70.4%;烧结件的拉伸强度、断裂伸长率及冲击强度均随着铝粉平均粒径的减小而增大.
It is difficult for the commonly used mechanical mixing method to uniformly disperse the aluminum powders in the nylon12 matrix, and aluminum coagulation is formed. Therefore, nylonl2-coated aluminum powders for the application in the selective laser sintering ( SLS) were prepared by a solvent-precipitation method. Microcosmic morphologies of the composite powders were observed using SEM. The effects of aluminum contents and average particle sizes of aluminum powders on the properties of SLS parts were studied. Results show that aluminum particles are uniformly coated by nylon12, and there are almost no naked aluminum particles. When the content of aluminum powders is increased from 0 to 50wt% , the heat deflection temperature , tensile strength, bend strength, bend modulus, and hardness of the SLS specimens are increased by 87 ℃ , 10. 4% , 62. 1% , 122. 3% and 70. 4% respectively; The tensile strength, elongation at break and impact strength of the SLS specimens are all increased with the decreasig average particle size of aluminum powders.
参考文献
| [1] | H. Zarringhalam;N. Hopkinson;N.F. Kamperman .Effects of processing on microstructure and properties of SLS Nylon 12[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(0):172-180. |
| [2] | B. Caulfield;P.E. McHugh;S. Lohfeld .Dependence of mechanical properties of polyamide components on build parameters in the SLS process[J].Journal of Materials Processing Technology,2007(26):477-488. |
| [3] | T. J. Gill;K. K. B. Hon .Experimental investigation into the selective laser sintering of silicon carbide polyamide composites[J].Proceedings of the Institution of Mechanical Engineers, Part B. Journal of engineering manufacture,2004(b10):1249-1256. |
| [4] | 汪艳,史玉升,黄树槐.硅灰石填充改性尼龙12激光烧结材料[J].塑料工业,2006(12):10-11,18. |
| [5] | Alida Mazzoli;Giacomo Moriconi;Marco Giuseppe Pauri .Characterization of an aluminum-filled polyamide powder for applications in selective laser sintering[J].Materials & Design,2007(3):993-1000. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%