Oxides, sintering theory

In the present study, the same mechanism should be responsible of the increase of the apparent fracture resistance. SiC-AlN-YiOs composite was treated at 1300°C for ih in fluent argon to confirm this theory, in this condition, oxidation of the intergranular phase (YioAl2Si30i8N4) was completely inhibited and Kapp resulted equal to 4.5 MPa m , practically the same value of the as-sintered sample. 

Nickel hydroxide active material is provided by reacting nickel sulfate solution and an alkaline solution. A part of nickel of nickel hydroxide is substituted for Zn and Co for the improvement of the battery performance. The theory capacity of nickel hydroxide is 289 mAh/g by supposing one electron reaction. The utilization of nickel hydroxide of a sintered-type electrode is approximately 100 %, but that of a pasted-type electrode without a conductive additive is around 65 %. The improvement of the utilization is enabled by forming CoOOH conductive networks between nickel hydroxide particles. The cobalt compound (Co, CoO, Co(OH>2) is filled into the formed nickel substrate with nickel hydroxide as an additive. The Co compounds form a conductive network as CoOOH by charging. To improve the conductivity of the cobalt conductive layer, Co(OH)2 layer coating to the surface of nickel hydroxide particles and the oxidation treatment in an alkaline solution of this coated powder are suggested. 

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