期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 291, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2020.117020
关键词
Binder jetting additive manufacturing; Green parts; Binder saturation; Layer thickness; Strength
资金
- National Key Research and Development Project of China [2018YFB1105301]
- Hubei Key Research and Development Program [2020BAB049]
- Wuhan Science and Technology Project [2020010602012037]
This study explored the use of a binder mainly consisting of A-stage phenolic resin for BJAM to manufacture high-strength green parts. By optimizing parameters, green samples can possess the desired mechanical strength and surface roughness, which are beneficial for the structural stability during subsequent treatments.
Recently, binder jetting additive manufacturing (BJAM) was used to manufacture complex metal parts in an economical and large-scale way. However, the usage of resin to bond metal powder renders as-printed green parts with low strength, which is potential to cause the structural damages of final parts during post treatments. To overcome the intractable problem, a self-developed binder mainly consisting of A-stage phenolic resin was explored for BJAM to achieve relatively high-strength as-printed green parts. The binder can be cured as a C-stage phenolic resin with 190 degrees C and then provide a high strength for the green parts. The effect of layer thickness and binder saturation on the strength, dimensional accuracy, and surface roughness of the BJAM-printed 316 L stainless-steel green samples using the developed binder was investigated systematically. With the optimized parameters (a layer thickness of 100 mu m and a binder saturation of 30.2 %), green samples can possess the ultimate bending strength (UBS) of 10.08 MPa and the ultimate compressive strength (UCS) of 25.56 MPa, which are beneficial for the structural stability of the printed samples during subsequent treatments. A reduction in strength and an increase in roughness are observed with increasing the layer thickness for the as-printed green samples. An increment in binder saturation results in the improvement in strength and surface roughness of the green samples. The relationships between the binder and the mechanical performance of the green samples were discussed from the viewpoint of the uneven distribution of binder in depth. This work explored a promising binder with a low saturation for BJAM to fabricate 316 L green parts with desirable mechanical strength and acceptable surface roughness.
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