Paduan logam berpori berbasis magnesium sangat potensial dalam aplikasi prostesis biomedis. Kalsium, seng dan agen pengembang ditambahkan untuk melengkapi fungsi dan aplikasi paduan. Dalam studi ini, paduan logam berpori Mg-Ca-Zn dikembangkan dengan proses metalurgi serbuk menggunakan dolomit (CaMg(CO 3 ) 2 ) sebagai agen pengembang untuk menghasilkan pori jenis tertutup. Variasi ukuran agen pengembang dan temperatur sintering dilakukan dengan tujuan untuk mencapai ukuran, persentasi dan kehomogenan pori yang terbentuk dalam paduan, dimana pori berfungsi untuk pertumbuhan tulang baru. Komposisi (%berat) paduan yang dikembangkan adalah 84,5Mg-0,5Ca-5Zn-10CaMg(CO 3 ) 2 , dengan variasi temperatur sintering T = 650, 675, dan 700°C dan waktu tahan 5 jam, sedangkan ukuran dolomit CaMg(CO 3 ) 2 divariasikan -30 #, -50 #, -80 #. Paduan hasil sintering diuji XRD (x-ray diffraction) untuk menganalisis fasa yang terbentuk. Ukuran dan kehomogenan pori hasil sintering diamati dengan SEM (scanning electron microscopy), dan persentasi pori yang terbentuk diukur dengan menggunakan metode Archimedes sesuai standar ASTM B311-93. Sifat mekanik dari paduan hasil sintering diuji dengan alat uji kompresi mengacu pada standar ASTM D-695-02. Analisis XRD (x-ray diffraction) dalam paduan 84,5Mg-0,5Ca-5Zn-10CaMg(CO 3 ) 2 hasil sintering terbentuk fasa Mg sebagai matriks, MgO, CaCO 3 dan dolomit (CaMg(CO 3 ) 2 ). Persentasi porositas tertinggi diperoleh sebesar 32,60% dengan ukuran pori terbesar adalah ≤300 μm dan kekuatan tekan 143 MPa. Kondisi ini dihasilkan dalam paduan dengan ukuran partikel dolomit -30# dan temperatur sintering 700°C. Teknologi metalurgi serbuk dengan variasi temperatur sintering dan variasi ukuran agen pengembang dolomit berpengaruh signifikan terhadap ukuran, persentasi, dan kehomogenan pori serta sifat mekanik yang dihasilkan dalam paduan 84,5Mg-0,5Ca-5Zn.Kata kunci: logam berpori tertutup; biomaterial; paduan 84,5Mg-0,5Ca-5Zn; agen pengembang dolomit (CaMg(CO 3 ) 2 ); metalurgi serbuk Abstract [Title: Sintering Temperature and Size Variation Analysis of Dolomite Development Agency to Closed Pores Mg-Ca-Zn Metal Alloy Fabrication by Powder Metallurgy Process]Magnesium-based porous metal alloys have great potential in biomedical prosthesis applications. Calcium, zinc, and a foaming agent are added to complement the function and application of the alloy. In this study, Mg-Ca-Zn porous metal alloy was developed by powder metallurgy process and using dolomite (CaMg(CO3)2) as a foaming agent to produce a closed pore type. Various sizes of the foaming agent and the sintering temperatures are carried out to achieve the size and homogeneity of the pores formed in the alloy, where the pores function for new bone growth. The alloy's composition (wt%) was 84.5Mg-0.5Ca-5Zn-10CaMg(CO3)2, with different sintering temperatures T = 650, 675, and 700 °C and holding time of 5 hours, while the size of
Rare earth elements are strategic materials, difficult to obtain, and have wide uses. Currently, it is still difficult to separate and refine REE’s because it has similar physical and chemical properties. Solvent extraction is most successful method used for the separation of REE’s. Di-2-ethylhexyl phosphoric acid has been widely used in industry for the separation and of REE’s. Purpose of this study is effect of pH on basic parameters extraction which include distribution coefficient, extraction efficiency and separation factor in extraction gadolinium, terbium and europium through complex with D2EHPA. Determination effect pH is a parameter determined in process extracting standard solutions gadolinium, terbium and europium using D2EHPA with n hexane. Basic parameters in extraction gadolinium, terbium and europium with D2EHPA at pH 4 are as follows KdGd = 89.90; αGd/Tb = 5.63, Gd/Eu = 1.83; %E = 98.90. KdTb = 15.94; αTb/Gd = 0.17; Tb/Eu = 0.32; % E = 94.10; KdEu = 1.40; αEu/Gd = 0.01, Eu/Tb = 0.08; %E = 98.29. From these valuesit can be concluded that gadolinium, can be separated from terbium and europium by the solvent extraction method by forming complex D2EHPA with best separation results obtained at pH 4.
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