RACHMADTULLAH, MUHAMMAD BAYU (2024) ANALISIS PENGARUH TEKNIK SINTERING TERHADAP DENSIFIKASI HIDROKSIAPATIT DAN SIFAT MEKANISNYA. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Hydroxyapatite (Ca10(PO4)6(OH)2, HA) is a bioceramic material used in biomedical applications. This study compares the effects of conventional sintering and two-step sintering techniques on the densification and mechanical properties of HA. HA powder was formed into pellets and sintered conventionally at 800, 900, 1000, and 1100ºC for 2 hours, as well as using two-step sintering at 1000ºC - 800ºC and 1000ºC - 900ºC for 2 and 5 hours, respectively. Density, mechanical strength (Vickers Microhardness), XRD, and microstructure (Raman Microscope) were tested. The two-step sintering technique increased the density from 2.5231 g/cm³ to 2.8378 g/cm³ and hardness from 86.87 kg/mm² to 102.913 kg/mm² at a holding temperature of 800°C. XRD showed the HA phase with slight β-TCP impurities. The two-step sintering technique produced finer and more homogeneous HA grains, indicating improved mechanical properties and microstructure of HA compared to conventional sintering techniques. Keywords : Hydroxyapatite, Sintering, Density, Hardness Test, Microstructure Hidroksiapatit (Ca10(PO4)6(OH)2, HA) adalah bahan biokeramik yang banyak digunakan dalam aplikasi biomedis. Penelitian ini membandingkan pengaruh teknik sintering konvensional dan two-step sintering terhadap densifikasi dan sifat mekanik HA. Serbuk HA dibentuk menjadi pellet dan disintering konvensional pada 800, 900, 1000, dan 1100ºC selama 2 jam, serta dengan two-step sintering pada 1000ºC - 800ºC dan 1000ºC - 900ºC masing-masing selama 2 dan 5 jam. Densitas, kekuatan mekanik (Vickers Microhardness), XRD, dan struktur mikro (Raman Microscope) diuji. Teknik two-step sintering meningkatkan densitas dari 2,5231 g/cm³ menjadi 2,8378 g/cm³ dan kekerasan dari 86,87 kg/mm² menjadi 102,913 kg/mm² pada temperatur tahan 800°C. XRD menunjukkan fasa HA dengan sedikit pengotor β-TCP. Teknik two-step sintering menghasilkan butir HA yang lebih halus dan homogen, menunjukkan peningkatan sifat mekanik dan mikrostruktur HA dibandingkan teknik sintering konvensional. Kata Kunci : Hidroksiapatit, Sintering, Densitas, Uji Kekerasan, Struktur Mikro
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