Development of Porous Ti-6Al-4V Mix with Palm Stearin Binder by Metal Injection Molding Technique

Abstract

Good potential of biocompatibility and excellent mechanical properties, porous Ti-6Al-4V has become a great interest for biomedical applications. In this study, porous Ti-6Al-4V was fabricated by Metal Injection Molding (MIM) using Palm Stearin (PS) and Polyethylene (PE) binder together with sodium chloride (NaCl) as a space holder. Rheological characterization was performed to evaluate the flowability of the feedstocks for injection molding and the feedstocks exhibited a pseudoplastic behavior which is suitable for injection. The as-sintered parts were fabricated as the mixing, injection molding, debinding and sintering were conducted successfully. The mechanical properties of the as-sintered parts were investigated via tensile test and the results obtained were closed with the established range. Shrinkage, density and X-Ray Diffractometry (XRD) of the as-sintered parts were compared with the theoretical values which were found closed to the acceptable ranges. The microstructure of the surface and cross-section were observed under Scanning Electron Micrograph (SEM) and optical microscope to analyze the specimens before and after sintering. Generally, palm stearin binder system added with space holder to fabricate porous Ti-6Al-4V by MIM is feasible and has shown a good potential for biomedical applications.

Effect of spark plasma sintering temperature on the pore characteristics, porosity and compression strength of porous titanium foams

“…A typical close-packed hexagonal (α-hcp) lattice of Ti is detected as the main phase for all the samples, and the diffraction peaks are similar in shape. However, the intensity of the sintered foam peaks is extremely low compared to that of the powder, and this can be attributed to the sample surface morphology effect, as was also observed by Jamaludin et al [16]. As the temperature increases, there is a slight shift of the Ti peak at an angle of 2 = 40.195…”

Pengoptimuman Parameter Pengacuan Suntikan terhadap Ketumpatan Jasad Anum untuk Komposit Aloi Titanium-Wolastonit

“…Terdapat empat langkah utama dalam proses PIM iaitu pencampuran bahan serbuk dengan bahan pengikat membentuk bahan suapan, penyuntikan bahan suapan ke dalam acuan, penyahikatan dan pensinteran (Chua et al 2013). Sistem bahan pengikat memainkan peranan yang utama untuk melincirkan bahan suapan semasa proses pengacuan suntikan dijalankan dengan menyebarkan bahan serbuk secara seragam dan mengisi semua ruang antara zarah serbuk (Jamaludin et al 2015). Menurut Raza et al (2017), bahan pengikat bertindak sebagai kenderaan untuk membolehkan bahan serbuk mengalir ke dalam acuan dan memberikan kekuatan kepada bahagian yang dibentuk untuk membolehkan ia dikendalikan dengan mudah.…”

“…Sifat aliran pseudoplastik adalah penting bagi bahan suapan dalam proses PIM kerana ia boleh mengelakkan daripada fenomena pemisahan antara serbuk dan bahan pengikat berlaku semasa proses penyuntikan bahan suapan ke dalam acuan dijalankan (Thavanayagam et al 2014). Indeks sifat aliran bahan suapan diperoleh daripada persamaan berikut (Jamaludin et al 2015):…”

Comparative Study on Bending Strength of Metallic Bone Staple

“…From the biocompatibility point of view, adverse biological reaction which occurs with the usage of commercialized implants becomes the main concern when dealing with the research and development of new implant materials. Implant materials such as Ti6Al4V and NiTi [6], [7] are both widely used and recognized. However, there is a risk of inflicting negative impact to the patient receiving Ti6Al4V and NiTi implants caused by the presence of Al and Ni due to the elemental toxicity risk [8]- [10].…”