摘要
为了降低金属基金刚石超薄切锯的厚度、提高强度,采用冷压烧结法,以Fe基混合粉末为原材料,通过改变冷压力,制备平均厚度为0.21 mm的Fe基金刚石超薄切锯胎体;用显微硬度仪、OM、SEM、XRD和万能力学试验机等表征松装粉末和压坯显微硬度、压坯组织、烧结胎体组织和力学性能,研究冷压坯致密化机理以及冷压力对烧结胎体组织和力学性能影响.结果表明:压力<205 MPa时Cu、Fe粉均发生了显著的加工硬化现象,Cu粉变形速率较Fe粉快,使Cu、Fe粉聚集、冷焊,阻碍致密化;压力>205 MPa时Cu、Fe粉发生大量塑性变形,组织致密,密度增大;烧结胎体以(Fe,Ni)、Fe1.3Sn、Cu40.5Sn11、Cu81Sn22和Fe为主相;拉伸断口形貌主要包括塑坑断口、解理和沿颗粒脆性断口,168 MPa烧结胎体力学性能最优.
To reduce the thickness and enhance the strength of metal based diamond ultra thin sawing, Fe- based diamond composite ultra thin sawing matrixes with mean thickness of 0.21 mm were prepared by cold compaction sintering in different cold pressure. The raw material was Fe-based mixed powder, and the microhardness of loose powder and green, microstructure of green, microstructure and mechanical properties of sintering matrixes were inves＇tigated by microhardness tester, OM, SEM, XRD, universal mechanical tester. The densification mechanism of green and effect of cold pressure on the microstructure and mechanical properties of hot, pressed matrixes were also studied. The results showed that the phenomena of work hardening occurred in Cu and Fe powders of green below 205 MPa, the deformation rate of Cu powder was faster than that of Fe, and the Cu and Fe powders were gathered and cold welding, which prevented the densification of green. The Cu and Fe powders deformed a lot over 205 MPa, and the microstructure of green was compact and the density was increased. The main phases of hot pressed matrixes were （Fe, Ni）, Fe1.3 Sn, Cu40.5 Sn11, Cu81 Sn22 and Fe. The fracture morphology of hot pressed matrixes were dimple, cleavage, and brittleness along with iron rich, and the mechanical properties of hot pressed matrixes at 168 MPa was the best.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2014年第1期54-60,共7页
Materials Science and Technology
基金
国家自然科学基金资助项目(51165021)
关键词
单轴模压法
热压烧结
金刚石复合材料超薄切锯
Fe基胎体
组织
力学性能
uniaxial die pressing
hot pressing
diamond composite ultra thin sawing
Fe-based matrix
microstructure
mechanical properties
