交变磁场对重力SHS制备复合管微观结构和机械性能的影响(英文)

将交变磁场引入自蔓延高温合成反应,研究其对Al2O3复合管陶瓷层结构和力学性能的影响.结果表明:交变磁场可以促进燃烧反应的进行,随着磁感应强度的增加,α-Al2O3的枝晶尺寸减小,形态逐渐向细小的等轴晶形态过渡.复合管的抗压强度和抗剪强度随着磁感应强度的增加而增加.其中当磁感应强度为0.20T时,抗压强度和抗剪强度分别达418MPa和19.5MPa,比未引入交变磁场前分别提高了19.1%和21.9%.

EFFECTS OF ALTERNATING MAGNETIC FIELD ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF COMPOSITE PIPE PREPARED BY GRAVITATIONAL-SHS

The effect of alternating magnetic field on the structure and properties of the Al2O3 ceramic layer of composite stainless steel pipe was studied in the preparation using the self-propagating high-temperature synthesis (SHS) process. The results show that the combustion reaction in the SHS process can be improved by using an alternating magnetic field. The size of α-gl2O3 dendritic crystals decreases with the increase of magnetic flux density, and its crystals of α-Al2O3 are transformed from the dendritic crystals into a fme equiaxed shape. The compressive strength of composite pipe prepared by SHS and the shearing strength between ceramic layer and stainless steel increase with the increase of magnetic flux density, and reach 418 and 19.2 MPa at a magnetic flux density of 0.20 T, respectively, increased by 19.1% and 21.9%, respectively compared with that of the pipe without alternating magnetic field.