Biphase CaO–P2O5 ceramic based on powder synthesized from calcium acetate and ammonium hydrophosphate

Properties of calcium phosphate powder synthesized from calcium acetate and sodium hydrophosphate

“…Previous works have examine the production of ceramic from HAP powders synthesized from different pairs of precursors, such as calcium nitrate and ammonium hydrophosphate [6], calcium chloride and sodium hydrophosphate [7], calcium acetate and potassium hydrophosphate [8], calcium chloride and potassium hydrophosphate [9], and calcium acetate and sodium hydrophosphate [10]. Ceramic has also been obtained from brushite or monetite powders synthesized from ammonium hydrophosphate and calcium nitrate, chloride, and acetate [5], calcium acetate and potassium hydrophosphate [11], and calcium chloride and potassium hydrophosphate [12].…”

Calcium Phosphate Powder Synthesized from Calcium Acetate and Ammonium Hydrophosphate for Bioceramics Application

“…Obviously, the HPO 4 2− ions can be provided by phosphoric acid or by ammonium hydrophosphates. A variety of calcium compounds, such as CaCO 3 [14], Ca(OH) 2 [10,11], CaCl 2 [15,16], Ca(NO 3 ) 2 [7,8,13,16,17], and the carboxylic acids salts (calcium formate [18], calcium acetate [16,19,20], calcium propionate [21][22][23], calcium lactate [24,25], or calcium saccharates [26,27]) can be used as the source of Ca 2+ ions. Most of the listed carboxylic acids or their salts are used as pH regulators in the food industry [28]; furthermore, these carboxylates, ammonium, and (hydro)phosphate ions are known as components of aqueous buffer solutions [29].…”

“…It is worth mentioning that the phase composition of the ceramics based on the calcium phosphate powders (prepared in turn via the interaction of calcium acetate and ammonium hydrophosphate in an aqueous solution without pH adjusting) is affected by the precursors concentrations and ratio used in the calcium phosphate synthesis [16,19]. In detail, calcium phosphates powders synthesized from 0.5 M Ca(CH 3 COO) 2 and 0.5 M (NH 4 ) 2 HPO 4 aqueous solutions (at Ca/P = 1) [16] and from 2.0 M Ca(CH 3 COO) 2 and 1.33 M (NH 4 ) 2 HPO 4 (at Ca/P = 1.5) [19] contained low-crystalline hydroxyapatite and amorphous phases. However, phase composition of the ceramic materials after firing at 1100 • C was different: Ca 2 P 2 O 7 + Ca 3 (PO 4 ) 2 in the former case [16] and Ca 3 (PO 4 ) 2 + Ca 10 (PO 4 ) 6 (OH) 2 in the latter case [19].…”

“…In detail, calcium phosphates powders synthesized from 0.5 M Ca(CH 3 COO) 2 and 0.5 M (NH 4 ) 2 HPO 4 aqueous solutions (at Ca/P = 1) [16] and from 2.0 M Ca(CH 3 COO) 2 and 1.33 M (NH 4 ) 2 HPO 4 (at Ca/P = 1.5) [19] contained low-crystalline hydroxyapatite and amorphous phases. However, phase composition of the ceramic materials after firing at 1100 • C was different: Ca 2 P 2 O 7 + Ca 3 (PO 4 ) 2 in the former case [16] and Ca 3 (PO 4 ) 2 + Ca 10 (PO 4 ) 6 (OH) 2 in the latter case [19]. These examples show that phase composition of the as-synthesized and fired calcium phosphates depends on the precursors concentrations in the reaction mixture.…”

Разработка Составов Масс На Основе Фосфатов Кальция Для 3d-Печати Керамических Изделий

“…Однако наиболее распространенной реакцией служит взаимодействие нитрата кальция и гидрофосфата аммония, при котором образуется легко удаляемый летучий аммиак [11][12][13][14][15]. Образующийся нитрат аммония перитектически разлагается при температуре около 210°С на газообразные N 2 O и Н 2 О. Также для синтеза порошков фосфатов кальция (гидроксиапатита), свободных от цитотоксичных неорганических примесей, могут применяться следующие реакции взаимодействия: нитрита кальция и фосфата аммония [16]; ацетата кальция Ca(CH 3 COO) 2 и триэтилфосфата (C 2 H 5 O) 3 PO 4 [17]; сахарата кальция и гидрофосфата аммония [18]; ацетата кальция Са(СН 3 СОО) 2 и гидрофосфата аммония (NH 4 ) 2 HPO 4 [19]; лактата кальция и гидрофосфата аммония [20].…”