Study on the improvement of synthesis of ferric stearate;

HSt 3, NaOH and FeCl 3 were used to synthesize Ferric stearate by the method of double decomposition reaction and the best conditions of the ferric stearate were characterized by ICP, IR and UV.

The paper describes about the turning technology of the chilled cast iron calender roll for the paper machinery, introduces the cutting tool material, cutter geometric parameter, cutting value and cutting result, explains the selecting principle of cutter date and the analysis of experimental result.

The camshaft with excellent wear resistance was obtained by using the chilled cast iron with composition of 3.

The effect of niobium on cast iron and microstructure and properties of niobium－ containing cast iron was described including the morphology of niobium existing in cast iron,influence of niobium on structure and properties of gray iron,supercooled gray iron and chilled cast iron.

5% hi-Cr cast iron chips was used as substitutes for Ni-hard cast iron chips to produce of Ni-hard cast iron rollers with the other production conditions and process measures unchanged.

In this paper, the author analyzes the main factors, especially hard iron interference and soft iron interference, which influence the digital compass′s heading precision.