Research on catalyst debinding process of 316L/POM composite parts fabricated by fused deposition modeling
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摘要: 采用熔融沉积成型制备了316L/POM复合材料成型坯，研究了脱脂温度、催化剂流量、脱脂时间、试样尺寸和填充率等参数对熔融沉积成型坯脱脂率的影响。结果表明：随着脱脂温度的增大，脱脂率升高，但在130～140 ℃时有所下降。随着催化剂流量和脱脂时间的增大，脱脂率升高。随着试样厚度和填充率的增大，脱脂率降低，但试样的平面尺寸对脱脂率的影响不大。通过对熔融沉积成型坯的计算机断层扫描和扫描电子显微镜观察发现，在熔融沉积成型打印时，熔融丝料间隙形成的气体交换通道网可以加快脱脂速率。
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关键词:
- 熔融沉积成型 /
- 催化脱脂 /
- 脱脂率 /
- 316L/POM复合材料 /
- 3D打印
Abstract: 316L/POM composite parts were prepared by fused deposition modeling (FDM). The effects of debinding temperature, catalyst flow rate, debinding time, sample size, and filling rate on the debinding rate of FDM parts were studied. The results show that, the debinding rate increases with the increase of debinding temperature but decreases at 130~140 ℃. The increases of the catalyst flow rate and debinding time aggrandize the bebinding rate. The debinding rate decreases with the increase of the sample thickness and filling rate, but the plane size of the samples has little impact on the debinding rate. The computed tomography (CT) and scanning electron microscopy (SEM) of FDM parts reveal that the gas exchange channel network formed in the large fuse gaps during FDM printing can accelerate the debinding rate.-
Key words:
- fused deposition modeling /
- catalytic debinding /
- debinding ratio /
- 316L/POM composites /
- 3D printing
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图 1 脱脂率和脱脂温度的关系
Figure 1. Relationship between the debinding rate and the debinding temperature
图 2 脱脂率和催化剂流量的关系
Figure 2. Relationship between the debinding rate and the catalyst flow rate
图 3 脱脂率和脱脂时间的关系
Figure 3. Relationship between the debinding rate and the debinding time
图 4 试样尺寸和填充率对脱脂率的影响：（a）平面尺寸；（b）厚度；（c）填充率
Figure 4. Influence of the specimen size and filling rate on the debinding rate: (a) plane size; (b) thickness; (c) filling rate
图 5 熔融沉积成型坯计算机断层扫描图：（a）菱形块顶点截面图；（b）菱形块内部截面图；（c）正面图；（d）实物渲染图
Figure 5. CT diagram of the FDM parts: (a) cross-section of lozenge peak; (b) cross-section of inside the lozenge; (c) front view; (d) object rendering diagram
图 6 熔融沉积成型坯催化脱脂前后显微形貌：（a）脱脂前；（b）脱脂后
Figure 6. SEM images of the FDM parts before and after catalyst debinding: (a) before bebinding; (b) after bebinding
表 1 实验材料配比（质量分数）
Table 1. Experimental material composition
% 316L不锈钢粉末（气雾化） 聚甲醛（POM） 聚丙烯（PP） 氧化锌 邻苯二甲酸二辛酯和邻苯二甲酸二丁酯混合物
（质量比0.3:10.0）86 11 1 1 1 
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表 2 熔融沉积成型打印参数
Table 2. Printing parameters of the fused deposition modeling
层高 / mm 打印速度 /
(mm∙s‒1)喷嘴直径 / mm 填充方式 线宽 / mm 打印平台温度 / ℃ 喷嘴温度 / ℃ 外壳层数 /
外壳形式0.2 20 0.6 往复直线填充 0.7 130 230 3层/偏置挤出
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表 3 对比实验中催化脱脂条件
Table 3. Experimental scheme of the catalytic degreasing conditions
脱脂温度 / ℃ 催化剂流量 / (mL∙min‒1) 脱脂时间 / h 试样尺寸 / mm 填充率 / % 氮气流量 / (m3∙h‒1) 催化剂 110、120、
130、1400.05、0.15、
0.25、0.350.5、1.0、2.0、
3.0、4.0(0.6、0.8、1.0、1.2、1.4)×(25×20)×6
25×20×(4、6、8、10)30、40、50、60、
70、80、90、1000.25 68硝酸
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