Sintering densification behaviors and microstructural evolvement of W-Cu-Ni composite fabricated by selective laser sintering

Rapid Development of an Injection Mold with High Cooling Performance Using Molding Simulation and Rapid Tooling Technology

“…Thus, some reinforcing fillers such as wollastonite, molybdenum disulfide [ 52 ], glass sphere, zirconia [ 53 , 54 , 55 ], silica sand, glass fibers , or silicon nitride [ 56 , 57 , 58 ] were recommended to add in the matrix materials. Additionally, metal AM technologies such as DB [ 59 ], SLS [ 60 , 61 ], SLM [ 62 ], electron beam melting, or direct metal laser sintering were recommended for manufacturing injection molds with optimum CCCs for mass production of wax patterns. The water was employed as the coolant.…”

Microstructure and strengthening mechanisms of 90W–7Ni–3Fe alloys prepared using laser melting deposition

“…reducing the processing time [2,[10][11][12][13][14][15][16]. Among these methods, additive manufacturing (AM), using methods such as laser melting deposition (LMD) or selective laser melting (SLM), has attracted much interest due to its potential to allow near net-shape manufacturing of complex components directly from digital models [15][16][17][18][19][20][21][22][23][24][25][26][27]. The high energy density of the laser beam can heat up the powders quickly (typically in the order of 10 -3 ~10 -1 s), while a small molten volume results in a fast cooling rate as the beam moves to the next local volume.…”

“…The ultrafast heating and cooling rates of LMD and SLM (>10 3 ~10 4 K/s) can significantly reduce the time during which structural coarsening can occur. However, for SLM-processed WHAs, the combination of a relatively small melt pool (on the order of 100 µm) and very fast cooling rates (10 5 ~10 6 K/s) [28] can lead to lack of fusion, thereby resulting in a limited rearrangement of the W particles [16,18,[20][21][22][23]. As such, even with the use of powder-preheating, the microstructure of SLM-processed WHAs often contains a non-uniform distribution of W particles and a large number of pores, which makes SLM-processed WHAs very brittle [16].…”

Multimaterial 3D Printing for Arbitrary Distribution with Nanoscale Resolution

“…Due to its capacity of rapid prototyping for arbitrary shape, it is widely applied in aerospace [1], medical health [2,3], structural electronics [4], and mold [5]. The traditional 3D printing technologies including stereolithography [6,7], selective laser sintering [8,9], fused deposition modeling [10,11] have consistently been improved, however they are still subject to the low-throughput and low-resolution fundamentally resulting from point-by-point printing and large printing unit size, in which the optimum printing resolution of approximately 20–50 μm is available [12]. Therefore, as an extension of 3D printing, continuous liquid interface production is developed with higher efficiency [13,14,15], as well as femtosecond laser direct writing based on two-photon polymerization with higher resolution of up to 100 nm [16,17,18,19,20,21].…”