Research On Quality Controlling Of Ceramic Layer Made By Technology Of Lining Ceramic On Surface Of Teel By Means Of Redundant Heat From Molten Steel

As an indispensable basic technology, surface engineering technology caneffectively enhance both abrasion resistance and corrosion resistance for metal materials.There are some flaws existing in conventional surface engineering technology, such ascomplex craft, high energy consumption and low link strength between surface layer andmatrix materials. In order to solve these technique shortages the new technology usingthe redundant heat of molten steel to prepare the lining ceramic layer on the surface ofcasting steel was researched. The compound particle containing ceramic powder andmetal powder is synthesized in the first step, and then the particle is conglutinated on thesurface of moulding board with high temperature glue, afterwards, the molten steel ispoured into the mold, the ceramic compound particle is sintered on the surface of caststeel through the redundant heat of steel melt and get the metallurgical combination. Inthe thesis the technology of controlling the quality of ceramic layer are researched, thecharacteristic performance such as the combining extent of ceramic layer lining, thethickness and the smoothness of the surface are examined. Because of constituent andparticle size having significant impact on the quality of the porcelain lining layer, the twofactors both of different compositions and particle size are examined by a lot ofexperiment, based on the comparison experiment result, the best compositions andparticle size are confirmed. Through building the model of compound powder particle, itwas found that ceramic compound particles size determines the area of the gap bycalculating the gap of a single particle, which affects the melt injection volume. UsingS-3400N type SEM observed the thickness of ceramic layer, its microstructure, andinterface bonding situation between lining ceramic layer and matrix. Using EDXanalyzed component distribution of lining porcelain layer. The result shown: When steelplate as template, the ceramic layer lining is smooth and combined firmly with the molten steel. When the WC content is30%, the ceramic layer lining is smooth. WhenWC powder content in the compound powder is excessive, it needs further heat energy tomold ceramic layer lining, but the temperature of molten iron can’t afford adequate heatenergy. When the composite powder particle size of20-40meshes, the ceramic layerlining is tight integration with the molten steel and the average thickness of the porcelainlayer lining is120to150microns.