采用铁基熔敷材料 ,在铸铁激光熔敷层内得到内生 Ti C.研究了内生 Ti C和 Fe3 C对熔敷层耐磨性的影响 ,分析了内生 Ti C数量及体积分数对熔敷层磨损表面形貌及磨损质量损失的影响规律 .结果表明 ,通过引入内生 Ti C可以显著改善铸铁表...采用铁基熔敷材料 ,在铸铁激光熔敷层内得到内生 Ti C.研究了内生 Ti C和 Fe3 C对熔敷层耐磨性的影响 ,分析了内生 Ti C数量及体积分数对熔敷层磨损表面形貌及磨损质量损失的影响规律 .结果表明 ,通过引入内生 Ti C可以显著改善铸铁表面激光熔敷层的抗磨性能 ,这主要是由于 Ti C硬度很高 。展开更多
A simpler and more convenient method for producing wear-resistant, TiC-reinforced coatings were investigated in this study. It consists of the simultaneous synthesis and deposition of TiC-Fe materials by oxyacetylene ...A simpler and more convenient method for producing wear-resistant, TiC-reinforced coatings were investigated in this study. It consists of the simultaneous synthesis and deposition of TiC-Fe materials by oxyacetylene flame spraying. Solid reagents bound together to form a single particle are injected into the flame stream where an in-situ reaction occurs. The reaction products are propelled onto a substrate to form a coating. Microstructural analyses reveal that TiC and Fe are the dominant phases in the coatings. The reaction between Ti and C happens step by step along with the reactive spray powder flight, and TiC-Fe materials were mainly synthesized where the spray distance is 125-170 mm. The TiC-Fe coatings are composed of alternate TiC-rich and TiC-poor lamellae with different microhardness of 11.9-13.7 and 3.0-6.0 GPa, respectively. Submicron and round TiC particles are dispersed within a ductile metal matrix. The peculiar microstructure is thought to be responsible for its good wear resistance, which is better nearly five times than WC-reinforced cermet coatings obtained by traditional oxyacetylene flame spray.展开更多
By means of an inherent elevated-temperature of poured liquid steel,a Ti-C-30wt%Fe preform,which was pre-placed in a mould cavity,was directly ignited and a combustion synthesis reaction took place.As a result,a TiC-F...By means of an inherent elevated-temperature of poured liquid steel,a Ti-C-30wt%Fe preform,which was pre-placed in a mould cavity,was directly ignited and a combustion synthesis reaction took place.As a result,a TiC-Fe cermet coating with a thickness of about 10mm was simultaneously synthesized on the solidified steel matrix.The synthesized coating exhibits a feature of graded composite structure,in which both the amount and size of TiC particles decrease gradually with an increasing distance from the furface of the coating.Moreover,by a proper casting technique,the pores formed during the combustion synthesis of the preform could be centrally distributed in 2-3mm in outer layer of the coating.When this outer porous layer was worn off,the rest coating with a thickness of about 8mm possesses a dense structure and a high abrasive wear resistance.展开更多
To study the formation of layer shaped pores in TiC Fe cermet, two Ti C Fe powder compacts containing Ti powders with two size ranges (< 44μm and 135～ 154μm ) respectively were ignited in a special ignition mode...To study the formation of layer shaped pores in TiC Fe cermet, two Ti C Fe powder compacts containing Ti powders with two size ranges (< 44μm and 135～ 154μm ) respectively were ignited in a special ignition mode. The combustion temperatures of the reactions were measured, the phase constituents of the combustion synthesized products were inspected by X ray diffractometry (XRD), and the structures of the products were observed with scanning electron microscope (SEM). In the case of the finer Ti powder used, TiC Fe cermet and pore rank in an alternately laminar shape, and the shape of the pore is the same as that of the combustion wavefront, implying that the layer shaped pore results from a gather of the retained gas into the combustion wavefront. While in the case of the coarser Ti powder used, the lower combustion temperature causes the gather of the retained gas to be difficult, the pore being present in an arbitrary shape and distributing randomly.展开更多
采用粉末冶金技术设计制备了质量分数4%TiC强化的FeCrB基抗磨复合材料,与GCr15钢球配副进行往复式干摩擦实验,系统研究滑动速度和载荷对复合材料的干摩擦磨损性能的影响。使用X射线衍射(X-Ray Diffraction,XRD)、扫描电子显微镜(Scannin...采用粉末冶金技术设计制备了质量分数4%TiC强化的FeCrB基抗磨复合材料,与GCr15钢球配副进行往复式干摩擦实验,系统研究滑动速度和载荷对复合材料的干摩擦磨损性能的影响。使用X射线衍射(X-Ray Diffraction,XRD)、扫描电子显微镜(Scanning Electron Microscope,SEM)等技术分析了复合材料的物相成分和微观形貌。实验结果表明:复合材料物相为α-Fe、FeCr、TiC、Cr_(2)B和Fe_(2)B相。TiC的加入显著提高了材料的硬度,密度略有下降。随着滑动速度和载荷的增大,摩擦因数总体下降而磨损率显著增加。TiC对铁基体的钉扎作用抑制了材料的剥落和变形,材料的抗磨性能显著提高。综合分析,TiC能有效提升FeCrB合金的干摩擦学性能,其磨损机制主要是剥层磨损和磨粒磨损。展开更多
以TiFe粉和碳的前驱体(石油沥青)为原料,通过碳化制备Ti Fe C系反应喷涂复合粉末,并通过普通火焰喷涂技术成功制备了TiC/Fe金属陶瓷复合涂层;采用XRD、SEM和EDS对喷涂粉末和涂层的成分、组织结构进行了分析,同时对涂层耐磨性能进行了对...以TiFe粉和碳的前驱体(石油沥青)为原料,通过碳化制备Ti Fe C系反应喷涂复合粉末,并通过普通火焰喷涂技术成功制备了TiC/Fe金属陶瓷复合涂层;采用XRD、SEM和EDS对喷涂粉末和涂层的成分、组织结构进行了分析,同时对涂层耐磨性能进行了对比研究。结果表明:采用前驱体碳化复合技术制备的Ti Fe C系复合喷涂粉末粒度均匀、无有害相生成;喷涂所得到的TiC/Fe金属陶瓷复合涂层由片状的铁基体和弥散分布的TiC颗粒组成;TiC颗粒大致呈球形,粒度一般在0.5μm以下;相同条件下所获涂层的磨损体积大约是常规火焰喷涂Ni60涂层的1/5。展开更多
文摘采用铁基熔敷材料 ,在铸铁激光熔敷层内得到内生 Ti C.研究了内生 Ti C和 Fe3 C对熔敷层耐磨性的影响 ,分析了内生 Ti C数量及体积分数对熔敷层磨损表面形貌及磨损质量损失的影响规律 .结果表明 ,通过引入内生 Ti C可以显著改善铸铁表面激光熔敷层的抗磨性能 ,这主要是由于 Ti C硬度很高 。
基金This work was supported by the National "863" Project of China under grant No. 715-009-0130.
文摘A simpler and more convenient method for producing wear-resistant, TiC-reinforced coatings were investigated in this study. It consists of the simultaneous synthesis and deposition of TiC-Fe materials by oxyacetylene flame spraying. Solid reagents bound together to form a single particle are injected into the flame stream where an in-situ reaction occurs. The reaction products are propelled onto a substrate to form a coating. Microstructural analyses reveal that TiC and Fe are the dominant phases in the coatings. The reaction between Ti and C happens step by step along with the reactive spray powder flight, and TiC-Fe materials were mainly synthesized where the spray distance is 125-170 mm. The TiC-Fe coatings are composed of alternate TiC-rich and TiC-poor lamellae with different microhardness of 11.9-13.7 and 3.0-6.0 GPa, respectively. Submicron and round TiC particles are dispersed within a ductile metal matrix. The peculiar microstructure is thought to be responsible for its good wear resistance, which is better nearly five times than WC-reinforced cermet coatings obtained by traditional oxyacetylene flame spray.
基金FinanciallysupportedbytheNationalNaturalScienceFoundationofChina (No .5 0 2 76 0 2 3)
文摘By means of an inherent elevated-temperature of poured liquid steel,a Ti-C-30wt%Fe preform,which was pre-placed in a mould cavity,was directly ignited and a combustion synthesis reaction took place.As a result,a TiC-Fe cermet coating with a thickness of about 10mm was simultaneously synthesized on the solidified steel matrix.The synthesized coating exhibits a feature of graded composite structure,in which both the amount and size of TiC particles decrease gradually with an increasing distance from the furface of the coating.Moreover,by a proper casting technique,the pores formed during the combustion synthesis of the preform could be centrally distributed in 2-3mm in outer layer of the coating.When this outer porous layer was worn off,the rest coating with a thickness of about 8mm possesses a dense structure and a high abrasive wear resistance.
文摘To study the formation of layer shaped pores in TiC Fe cermet, two Ti C Fe powder compacts containing Ti powders with two size ranges (< 44μm and 135～ 154μm ) respectively were ignited in a special ignition mode. The combustion temperatures of the reactions were measured, the phase constituents of the combustion synthesized products were inspected by X ray diffractometry (XRD), and the structures of the products were observed with scanning electron microscope (SEM). In the case of the finer Ti powder used, TiC Fe cermet and pore rank in an alternately laminar shape, and the shape of the pore is the same as that of the combustion wavefront, implying that the layer shaped pore results from a gather of the retained gas into the combustion wavefront. While in the case of the coarser Ti powder used, the lower combustion temperature causes the gather of the retained gas to be difficult, the pore being present in an arbitrary shape and distributing randomly.
文摘采用粉末冶金技术设计制备了质量分数4%TiC强化的FeCrB基抗磨复合材料,与GCr15钢球配副进行往复式干摩擦实验,系统研究滑动速度和载荷对复合材料的干摩擦磨损性能的影响。使用X射线衍射(X-Ray Diffraction,XRD)、扫描电子显微镜(Scanning Electron Microscope,SEM)等技术分析了复合材料的物相成分和微观形貌。实验结果表明:复合材料物相为α-Fe、FeCr、TiC、Cr_(2)B和Fe_(2)B相。TiC的加入显著提高了材料的硬度,密度略有下降。随着滑动速度和载荷的增大,摩擦因数总体下降而磨损率显著增加。TiC对铁基体的钉扎作用抑制了材料的剥落和变形,材料的抗磨性能显著提高。综合分析,TiC能有效提升FeCrB合金的干摩擦学性能,其磨损机制主要是剥层磨损和磨粒磨损。
文摘以TiFe粉和碳的前驱体(石油沥青)为原料,通过碳化制备Ti Fe C系反应喷涂复合粉末,并通过普通火焰喷涂技术成功制备了TiC/Fe金属陶瓷复合涂层;采用XRD、SEM和EDS对喷涂粉末和涂层的成分、组织结构进行了分析,同时对涂层耐磨性能进行了对比研究。结果表明:采用前驱体碳化复合技术制备的Ti Fe C系复合喷涂粉末粒度均匀、无有害相生成;喷涂所得到的TiC/Fe金属陶瓷复合涂层由片状的铁基体和弥散分布的TiC颗粒组成;TiC颗粒大致呈球形,粒度一般在0.5μm以下;相同条件下所获涂层的磨损体积大约是常规火焰喷涂Ni60涂层的1/5。
