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Transparent aluminium ceramics: fabrication techniques, setbacks and prospects
Salifu Smith,Olubambi Peter Apata 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
The quest to replace glass with transparent aluminium ceramics (AlON) in some applications such as automotive, aircraft, armour, electronics, mobile phone screens, etc., is long in coming. More than ever, the dire need for this replacement is calling for urgent attention in the research world. Some years ago, the possibility of fabricating transparent metals sounded more like a mirage, but as time went by, the mirage of yesterday became the reality of today. Cost of fabrication, ease of fabrication and the development of inherent properties during fabrications have limited research interest in transparent AlON ceramics development and their wide usage. Regardless of some of these challenges, the shift of research focuses on the cost-eff ective ways of fabricating this ceramic metal will defi nitely revolutionise the engineering world. In an attempt to awaken the research in this area, this review paper presents the fabrication techniques, challenges/setbacks and prospects associated with transparent AlON ceramics.
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Fireclay bricks produced from lithomargic clay
Anthony Andrews,Simon K. Y. Gawu,Peter A. Olubambi 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Lithomargic clay underlying Awaso bauxite deposits is non-plastic and therefore cannot be used to produce ceramic bodies. The plasticity of lithomargic clay has been enhanced by addition of 20 wt% of clay binder, moulded, dried and fired at 1350 and 1400 o C, respectively. The dwell time was varied from 30 to 120 minutes. Properties such as bulk density, apparent porosity, linear firing shrinkage, and compressive strength were investigated. Crystalline phases after firing were determined using X-ray diffraction technique. The results show the properties measured depends on both the temperature and dwell time. The optimum compressive strength for such bricks could be achieved either by firing at 1350 o C for 120 minutes or at 1400 o C for 30 minutes.
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Falodun Oluwasegun Eso,Oke Samuel Ranti,Akinwamide Olukayode Samuel,Olubambi Peter Apata 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
The impacts of Cr-TiB 2 addition on densifi cation, hardness, microstructure, phase transformation, and corrosion were examined. The results indicated an even and uniform dispersion of TiB 2 particles in the titanium matrix, with no noticeable interfaces throughout the sintering process. The relative density of the sintered titanium-based composites dropped, with an increase in TiB 2 percentage. The microhardness result indicated that Ti6Al4V has 326 HV 0.5, while the maximum hardness was 598 HV 0.5, produced from 20 wt.% TiB 2 ceramic particles. The Ti6Al4V alloy depicts α-phase forms parallel plates in the prior β-grain borders and expands into the β-grain to create α-colonies, while the addition of 5–20 wt.% Cr-TiB 2 resulted in a microstructural transformation characterized by equiaxed α-precipitates embedded within the β-phase matrix, for all sam- ples. The electrochemical behaviour revealed that the E corr decreased as TiB 2 increased, while the i corr was higher. However, samples containing 5Cr and 5Cr-5TiB 2 moved to a more positive E corr region, whereas the i corr altered to a more negative area. This meant that the presence of ceramic reinforcements increased the corrosion resistance of the alloys and that higher concentrations of titanium diboride provided less protection against ion attack in a chloride environment.
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Avwerosuoghene Moses Okoro,Ronald Machaka,Senzeni Sipho Lephuthing,Mary Ajimegoh Awotunde,Peter Apata Olubambi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
In this study, the role of multiwall carbon nanotubes (MWCNT) on the microstructural evolution and mechanical propertiesof Ti6Al4V-based composites was investigated. This was conducted by dispersing different concentrations (0.5, 1.0 and1.5 wt%) of MWCNT into the Ti6Al4V matrix using shift-speed ball milling technique. Thereafter, the Ti6Al4V and thenanocomposites were consolidated via the spark plasma sintering technique. Various characterization techniques; scanningelectron microscopy (SEM), transmission electron microscopy (TEM) and light microscopy were conducted to understandthe microstructural evolution of the samples after the dispersion and sintering process. Subsequently, micromechanical andnanoindentation was carried out to reveal the mechanical properties of the fabricated samples. The morphological examinationusing SEM and TEM revealed the dispersibility of MWCNT dispersed within the Ti6Al4V matrix. Besides, the selectedarea diffraction and the fast Fourier Transform pattern demonstrated that the increase in concentration of the MWCNTexposed the nanotubes to adverse stresses during the dispersion process. Furthermore, the incorporation and increase inconcentration of the MWCNT in the titanium alloy resulted in microstructural and phase changes, which translate to tremendousimprovements in microhardness, nanohardness and elastic modulus up to 46.9%, 150.8%, and 169.5% respectively.
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Oluwasegun Eso Falodun,Samuel Ranti Oke,Babatunde Abiodun Obadele,Avwerosuoghene Moses Okoro,Peter Apata Olubambi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizingspark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different proportions(5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titaniummatrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopyand scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness andfracture morphology were investigated on the sintered composites. The experimental results revealed that the densificationof the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlONaddition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructureshows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprisesof a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture ofboth intergranular and transgranular fracture mechanism.
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