Properties of magnesia-stabilized zirconia powders prepared by a combustion route

Zirconia is known to undergo a series of destructive phase change

Synthesis of A1PO4, LaPO4 and KTiOPO4 by flash combustion

Fine particle AlPO4, LaPO4 and KTiOPO4 have been prepared by the flash combustion of aqueous solutions containing metal nitrate, ammonium hydrogen phosphate, ammonium nitrate or ammonium perchlorate and carbohydrazide or tetraformal trisazine. When rapidly heated at 400 °C, the solution containing the redox mixtures ignites to undergo self-propagating, gas-producing, exothermic reactions. Formation of crystalline phosphates was confirmed by powder X-ray diffraction patterns and IR spectra. The metal phosphates formed are fine and have 20�78 m2 g?1 surface area

Combustion Synthesis and Properties of Zirconia-Alumina Powders

Fine zlrconia-alumina composite powders with 10-80% $ZrO_2$ have been prepared by the combustion of aqueous solutions containing stoichiometric amounts of aluminium nitrate, zirconyl nitrate and carbohydrazide. The combustion-derived powders are of submicron size, with 40--65 $m^2/g$ BET surface area. The cold-pressed powders, when sintered at 1650°C for 3 h achieved 94-99% theoretical density. The sintered body of 10% $t-ZrO_2-AI_20_3$ has room-temperature Vickers hardness, Hv = 21.1 GPa and fracture toughness, $K_e=8.9MPa\hspace{2mm}m^{1/2}$

Combustion synthesis of cadmium ferrite

$N_2H_5M(N_2H_3CO_2)_3-mH_2O$ (M = Cd, m = 3; M = Fe, m = 1) and $N_2H_5Cd_{1/3}Fe_{2/3}(N_2H_3CO_2)_3-H_2O$ were prepared and characterized by elemental analysis IR spectrometry, and TG/DTA. The 3 hydrazinecarboxylates decompostion at 120, 165, and $145^0$ in air to give CdO, $\gamma-Fe_2O_3$, and $CdFe_2O_4$. The Cd hydrazinecarboxylate decomposition explosively leaving no residue