Joining of Ceramic Components in the Green State via LPIM

Abstract

It has been successfully demonstrated that ceramic materials can be joined in the green state without a second phase by using low pressure injection molded parts. The investigation of the joining interface revealed that a high quality interface can be achieved by carefully adjusting the different manufacturing steps. The use of monomodal particle size distribution in the used powder CT3000SG is inferior to a broader particle size distribution obtained by replacing 33% of the finer alumina powder by coarser CT1200SG. In this way the dewaxing process is significantly improved when the wall thickness of the part exceeds 3 mm. The investigation of the mechanical properties of the joined and sintered parts revealed, that the bending strength of the joined specimens achieved about 80 % of the unjoined, monolithic specimens.

Optimization of the printability envelope of low-viscosity powder-binder feedstocks used in material extrusion 3D printing

“…SA was added to enhance the chemical links between the powder and binder (Li et al , 2007; Ali et al , 2020). Thanks to its low viscosity, constant rheological properties and low cost (Waesche et al , 2007), PW was used to ensure the fluidity of the feedstocks (Waesche et al , 2007). Generally used as a thickening agent (Standring et al , 2016), a proportion varying from 3 to 15 Vol.% of EVA was added in the wax-based binder to tailor the overall feedstock viscosity and define its printability range.…”

Molding Properties of Inconel 718 Feedstocks Used in Low-Pressure Powder Injection Molding

“…During debinding and sintering treatments, the binder is completely removed to obtain a near-net shape dense metallic component [1]. Recent progress in feedstock formulations [2][3][4] has generated new opportunities for the injection of low-viscosity (<4 Pa⋅s) molten powder-binder mixtures (<100 ∘ C) into a mold cavity using an injection pressure generally lower than 700 kPa [5,6]. Initially used in ceramics forming [7][8][9], the LPIM technology has quickly become attractive for the development of high value-added metallic parts in the aerospace industry [10].…”