为了研究冷压坯致密化机理及加载速率对烧结胎体组织和力学性能影响，采用单轴模压＋热压烧结法，以Cu-Fe基元素混合粉末为原材料，在不同的冷压加载速率条件下制备Cu-Fe基金刚石复合材料超薄切锯胎体；用显微硬度仪、OM、SEM、XRD和万能力学试验机等表征冷压坯显微硬度、组织、烧结胎体组织和力学性能．结果表明：当加载速率较慢时，易变形的Cu、Ni粉在低压下发生加工硬化，抑制后续的塑性变形，阻碍压坯致密化；当加载速率过快时，压坯粉末的塑性变形不充分，造成脱模弹性后效，压坯密度下降；烧结Cu-Fe基胎体以Fe-Cr、（ Fe， Ni）、Ni-Cr-Fe、Fe、Cr和（ Cu， Sn）为主相；当加载速率为0．1 mm/min时烧结胎体的拉伸强度最大，拉伸断口形貌主要包括塑坑断口、解理断口和沿颗粒脆性断口．
To study the mechanism of cold compaction densification and the effect of loading rate on microstructure and mechanical properties, a Cu-Fe-based diamond composite ultra thin sawing matrix was prepared by uniaxial die pressing and hot pressing technology at different loading rate. The raw material was Cu-Fe-based single element mixed powder;the microhardness and microstructure of green, microstructure and mechanical properties of hot pressed matrixes were investigated by microhardness tester, OM, SEM, XRD, universal mechanical tester, and so on. The densification mechanism of green samples and the effects of load rate on the microstructure and mechanical properties of hot pressed matrixes were also studied. The results show that the work hardening of Cu and Ni powders with good deformability occurs at low pressure when the load rate is lower, which causes deformation succession restrained and green densification inhibited. The deformation of powders is insufficient when the loading rate is excessive higher, which causes more elastic after effect and green density decreased. The main phases of matrixes sintered are Fe-Cr、( Fe, Ni)、Ni-Cr-Fe、Fe、Cr and ( Cu,Sn) , the tensile strength is the highest at the loading rate of 0.1 mm/min, and there are dimple, cleavage and brittle fracture along with particles.
参考文献
| [1] | 董洪峰. 烧结温度对Cu基胎体性能的影响[D]. 兰州:兰州理工大学, 2011.,2011. |
| [2] | LIAO Y S,LUO S Y.Effects of matrix characteristics on diamond compositions [J]. Journal of Materials Science, 1993, 28:1245-1251.,1993. |
| [3] | LI Wensheng,ZHANG Jie,WANG Shucai,DONG Hongfeng,LI Yaming,LIU Yi.Characterizations and mechanical properties of impregnated diamond segment using Cu-Fe-Co metal matrix[J].稀有金属（英文版）,2012(01):81-87. |
| [4] | 章文姣,杨凯华,段隆臣.WC对金刚石钻头镍基钎料胎体性能的影响[J].粉末冶金材料科学与工程,2011(06):881-885. |
| [5] | 张小军, 徐西鹏. 新型高强度超薄金刚石锯片:中国,ZL 200720009141.5[P].2008-11-05.,2008. |
| [6] | 董洪峰,路阳,李文生,张杰.粉末冶金Fe基孕镶金刚石刀头的热处理强化[J].粉末冶金技术,2012(04):288-292,312. |
| [7] | 刘谷成,姜荣超,雷雨.热等静压（HIP）技术在超硬工具制造中的应用[J].金刚石与磨料磨具工程,2007(04):38-40. |
| [8] | 郭晓琴.金刚石磨具钎焊工艺研究[J].金刚石与磨料磨具工程,2007(03):40-42. |
| [9] | 李文生,王智平,路阳,等. 铜铁基粉末烧结金刚石复合材料及其制备方法:中国,ZL 200910021464. X [P]. 2012-02-22.,2012. |
| [10] | LU Yang, DONG Hongfeng, LI Wensheng. Effects of sintering temperature on the properties of Cu-Co-Based alloys matrix [J]. Advanced Materials Research, 2011, 201-203, 1757-1763.,2011. |
| [11] | ZHU Y Z, YIN Z M, XIANG Z D, et al. Cold densification behavior of multiple alloy powder containing Fe-Cr and Fe-Mo hard particles [J]. Powder Metallurgy, 2008, 51(2):143-149.,2008. |
| [12] | 王盘鑫.粉末冶金学[M].冶金工业出版社, 2006:117-163.,2006. |
| [13] | 果世驹. 粉末烧结理论[M]. 冶金工业出版社, 2007:301-324.,2007. |
| [14] | WANG Z, LIU J F, DING Y S,et al. Fabrication and properties of Fe/Al2 O3 composites [J]. Chinese Journal of Materials Reseach, 2012, 26(2):206-210.,2012. |
| [15] | 钟群鹏,赵子华. 断口学[M]. 北京:冶金工业出版社, 2006.,2006. |
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