选择性激光烧结尼龙材料及其挡水板制件性能研究

Properties of Selective Laser Sintered Nylon Material and its Water Retaining Plates

采用SLS尼龙12设计并成形了某箭体低承载挡水板薄壁结构,重点就SLS尼龙12及其碳纤维增强材料的力学、热学、断口微观形貌以及制件SLS工艺参数进行了研究。研究表明,选用牌号X1556尼龙12作为挡水板材料,其无缺口冲击强度81.2 kJ/m^2,断裂伸长率26.9%,烧结窗口温度差26.0℃,材料具备良好的抗冲击强度、断裂韧性和较宽的烧结窗口温度范围。优化设置成形工艺参数,如预铺粉起始温度为155℃,预铺粉保持温度168℃,加工温度169℃,填充速度4 000 mm/s,成形的挡水板制件外观良好,并且该制件通过了防水及耐热试验考核验证,为SLS尼龙成形技术在航天领域中的拓展应用打下基础。

LS nylon 12 is used to design and produce a low-bearing capacity and thin-wall water retaining plate structure for the launch vehicle body.The mechanical, thermal, fracture microstructure and SLS processing parameters of SLS nylon 12 and its carbon fiber reinforced materials are emphatically studied. Studies have shown that using nylon 12 powder with the brand X1556 as the material of the water retaining plates,the unnotched impact strength of the material is 81.2 kJ/m^2 the elongation at break is 26.9%, and the temperature difference of the sintering window is 26.0℃. The material has good impact strength, fracture toughness and a wide range of sintering window temperatures. In addition, the forming process parameters are optimized, such as a pre-powder starting temperature of 155℃, a pre-powder holding temperature of 168℃, a processing temperature of 169℃, and a filling speed of 4 000 mm/s, whereby the formed water retaining plates have a good appearance. The plates have passed the assessment and verification of the water retaining and heat resistance tests, which have laid the foundation for the expansion and application of SLS nylon producing technology in the aerospace industry.