Shahrizam Saad
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Shahrizam Saad
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Shahrizam, Saad
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Effect of sintering temperature on the preparation and characterization of green glass ceramic from rice husk ash as a matrix

2020 , Shahrizam Saad , Abdullah Chik , Khairel Rafezi Ahmad , Sharifah Shahnaz Syed Bakar

Powder metallurgy technique were proved successful net-shape technology which suitable for the production of green glass ceramic (GGC) from rice husk ash (RHA) and characterized by good physical and mechanical properties of glass ceramic. In this research, the glass sample was formed by mixing varying percentage of weight of silica, flux and additives. The aim of this work is to study the effect of the sintering temperature to the physical and mechanical properties of GGC. The samples were mixed in different volume fraction of additives which is 5%, 10% and 15% in constant composition of RHA and flux. The mixture was consolidated into rigid die compaction at 300MPa, then sintered at 450, 550 and 750°C. Vickers hardness test were investigated. The glass composite were then characterize by scanning electron microscopy (SEM). The GGC with 10% additives at sintering temperature 550°C shows highest hardness strength which is about 213.0 HV.

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Investigation on the effect of electrospinning parameters: voltage and flow rate on PVDF fiber

2023 , Ammar Athallah Budiarto , Sharifah Shahnaz Syed Bakar , Shahrizam Saad , Shuhaida Yahud

Polyvinylidene fluoride (PVDF) is a high purity thermoplastic fluoropolymer and high-capacity polymer that is employed in the electronics, space, and aeronautics industries. Electrospinning parameters have a considerable impact on the morphology, crystallinity, and electrical conductivity of PVDF fiber. Voltage and flow rate are the electrospinning parameters investigated in this study. As a result, the goal of this study is to investigate the effects of various voltages and flow rates on PVDF electrospun fiber. Electrospinning is the simplest and low-cost method to produce PVDF fibers by dissolving PVDF in solvent N, N-Dimethylformamide (DMF). About 15 wt% PVDF solution was used. Electrospinning parameters used were varied applied voltages 15 and 20 kV, flow rates 0.8, 1.0, 1.2, and 1.4 ml/h. Tip-to-collector distance was fixed at 15 cm. Scanning electron microscope (SEM), four-point probe, and X-ray diffraction (XRD) were performed to determine the morphology, electrical conductivity, and crystallinity phase of electrospun PVDF fibers. The SEM analysis concluded that bead formation occurs at higher flow rate and higher voltage. With higher flow rates and lower applied voltage, the fiber's thickness increases. XRD analysis shows that shift peak is observed among all fibers due to short electrospinning time which leads to insufficient thickness of electrospun mat, which affects the mechanical properties of fibers and causes peak shift. Four-point probe analysis concluded that the average conductance increases sharply as flow rate increases and the average resistance decreases. Also, as applied voltage increases, average conductance decreases and the average resistance increases.

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Pengenalan kepada Pemprosesan Fizikal Mineral

2013 , Shahrizam Saad , Faizul Che Pa , Abdullah Chik , Mohamed Faisal, Mohamed Noor

Umum mengetahui kepentingan mineral dan logam dalam kehidupan manusia seharian. Walau bagaimanapun, tidak ramai yang mempunyai pemahaman jelas berkaitan dengan pemprosesan peringkat awal bahan ini. Situasi ini mengilhamkan para penulis buku ini untuk menghasilkan buku Pengenalan Kepada Pemprosesan Fizikal Mineral. Objektif utama penulisan buku ini adalah untuk memperbanyakkan bahan rujukan berkaitan pemprosesan mineral dalam medium Bahasa Melayu bagi kegunaan para pelajar dan masyarakat secara amnya. Pemprosesan mineral adalah satu kaedah yang digunakan untuk pengekstrakan bijih bagi mendapatkan mineral atau logam berharga yang dikenali sebagai konsentrat. Bermula daripada aktiviti perlombongan, bijih yang dilombong seterusnya akan menjalani beberapa peringkat proses untuk memisahkan konsentrat daripada mineral reja. Antara proses-proses yang terlibat adalah proses pengurangan saiz atau kominusi yang melibatkan proses penghancuran dan pengisaran. Proses penyaringan dan pengelasan pula bertujuan untuk mendapatkan taburan saiz yang dikehendaki untuk proses-proses seterusnya. Proses pemisahan konsentrat pula bergantung kepada ciri-ciri fizikal mineral seperti garviti tentu, kekonduksian dan magnetik manakala pemisahan yang bergantung kepada ciri-ciri kimia permukaan mineral pula adalah melibatkan proses pengapungan. Konsentrat yang terhasil daripada proses yang melibatkan pemisahan menggunakan medium air seterusnya akan menjalani proses penyahairan bagi menyingkirkan kandungan kelembapan konsentrat sebelum dihantar kepada pelebur untuk tujuan peleburan.

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Asas seramik

2014 , Alida Abdullah , Shahrizam Saad , Abdullah Chik , Mohd. Mustafa Al Bakri Abdullah , Muhamad Qauyum Zawawi Ahamad Suffin

Buku ini membicarakan beberapa asas dalam bidang seramik. Ia meliputi aspek seperti pengenalan bahan seramik, seramik silikat, kaca dan seramik kaca, komposit matrik seramik, elektroseramik dan seramik oksida. Buku ini sesuai untuk dijadikan sebagai rujukan asas bagi pelajar-pelajar kejuruteraan bahan, kejuruteraan awam, sains dan lain-lain. Ia merangkumi beberapa subjek asas yang biasa dipelajari dalam bidang seramik.

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