Synthesis of Magnesium Diboride (MgB2) from Its Elements by Mechanochemical Method and Usage as Energetic Agent

Öz

Magnesium diboride is used as an initiator and accelerator in rocket fuels, and has an important place in high-yielding or purity-based defense industry. Therefore, its synthesis with high efficiency or purity has an important issue in the defense industry. Magnesium diboride synthesis was carried out using elementary magnesium (Mg), and elementary boron (B). The experiments were carried out by mechanochemical method under argon. The effect of various parameters such as milling time, ball/powder mass ratio, reactant ratio, and sintering process temperature on MgB2 synthesis were investigated. The products obtained were analyzed by using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM-EDS). After mechanochemical milling, one of the X-ray diffraction patterns, peaks of depicts the MgB2 were observed. Optimum conditions are determined as follows: ball/powder mass ratio is 8/1, milling time is 7 hours, ratio of reactants are determined as 10% B excess and sinter process temperature is 650 oC. At the end of the process, the impurities were removed with HCl solution (0.1 M) by 30 minutes leaching step. After the production and purification steps, the yield was calculated as 87.1% and the calorific energy value of the obtained MgB2 was measured as 9.2 kcal /g.

Anahtar Kelimeler

• Mechanochemical method,MgB2,leaching,energetic material

Mekanokimyasal Yöntemle Elementlerinden Magnezyum Diborür (MgB2) Sentezi ve Enerjetik Madde Olarak Kullanımı

Öz

Magnezyum diborür, roket yakıtlarında başlatıcı ve hızlandırıcı olarak kullanılmaktadır. Bu nedenle, yüksek verimlilikte veya saflıkta sentezlenmesi savunma sanayinde önemli bir yer tutmaktadır. Bu çalışmada, Magnezyum diborür sentezi, elementel magnezyum (Mg) ve elementel Bor (B) kullanılarak mekanokimyasal yöntem ile argon gazı atmosferinde gerçekleştirildi. Öğütme süresi, bilya/toz kütlesel oranı, reaksiyon girdilerinin oranı ve sinter sıcaklığı gibi çeşitli parametrelerin MgB2 sentezi üzerine etkisi araştırıldı. Elde edilen ürünler, X-Işını Kırınımı (XRD) ve Taramalı Elektron Mikroskopisi-Element Dağılım Spektroskopisi (SEM-EDS) kullanılarak analiz edildi. X ışını kırınımı desenlerinden mekanokimyasal öğütme sonrasında MgB2’e ait pikler gözlendi. Yapılan deneysel çalışmalar sonucunda MgB2 sentezi için optimum koşullar: bilye/toz kütlesel oranı 8/1, öğütme süresinin 7 saat, bor fazlalığında (%10 B fazlası) ve sinter işlem sıcaklığı ise 650 oC olarak belirlendi. İşlem sonunda safsızlık oluşturan fazlar, HCl çözeltisi (0,1 M) ile 30 dakika liç işlemi ile uzaklaştırıldı. Üretim ve saflaştırma basamaklarının ardından verim %87,1 olarak hesaplandı ve elde edilen MgB2 ‘ün kalorifik enerji değeri 9,2 kcal/g olarak ölçüldü.

Anahtar Kelimeler

• mekanokimyasal yöntem,MgB2,liç,enerjetik madde

Kaynakça

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