In the analysis of some in-seam slip fold structures in the area of Xuzhou and Huaibei Districta it is noted that there exist some in-seam roof and footwall rock layers extremely incompatible to the existence of coal ...In the analysis of some in-seam slip fold structures in the area of Xuzhou and Huaibei Districta it is noted that there exist some in-seam roof and footwall rock layers extremely incompatible to the existence of coal seams. Some of them are tbe slip fold structures that are wedged into coal seam by folding, but all of them are passively generated by in-seam shearing forces. In this paper, a discussion is put forward of the damage to coal seams by slip folds and the coal mining significance resulted from the study of slip fold structures.展开更多
Many properties of Mg matrix composites are mutually incompatible,and even completely repel each other.Here,we constructed a magnetic layered component in Mg matrix composite reinforced with reduced graphene oxide(RGO...Many properties of Mg matrix composites are mutually incompatible,and even completely repel each other.Here,we constructed a magnetic layered component in Mg matrix composite reinforced with reduced graphene oxide(RGO)through an in-situ interface reaction strategy,achieving simultaneous improvement in the strength,ductility,and electromagnetic shielding performance of the composite.The magnetic component is generated by the in-situ reaction of Fe_(2)O_(3)nanoparticles encapsulated on RGO with the Mg matrix.The superior strength-ductility synergy originates from layered heterostructure,which actives non-basal dislocations and enables a stable microcrackmultiplication.The heterogeneous layered structure strengthens the multi-level reflection of electromagnetic wave(EMW)inside the composite.The in-situ interfacial reaction introduces abundant of heterogeneous interfaces into the composites,which improves the interfacial polarization loss ability of the composites.The magnetic RGO layer can provide shape anisotropy that breaks the Snoek limit,thus improving the magnetic loss ability of composite in high-frequency electromagnetic fields.The synergistic action of multiple EMW loss mechanisms improves the electromagnetic shielding performance of composite.The current study emphasizes the influence of interface structure on the mechanical and functional properties of composites,and presents a promising approach for the development of structure/functional integrated composites with enhanced properties.展开更多
Magnesium silicate hydroxides(MSHs)with granular,schistose,and tubular morphologies were separately incorporated to enhance the tribological properties of phosphate/MoS_(2) composite coatings.The nano-schistose MSH de...Magnesium silicate hydroxides(MSHs)with granular,schistose,and tubular morphologies were separately incorporated to enhance the tribological properties of phosphate/MoS_(2) composite coatings.The nano-schistose MSH demonstrated superior tribological performance due to its effective interactions with the worn surface and frictional synergies with solid lubricants.Incorporation of nano-schistose MSH decreased the friction coefficient of composite coatings by about 34.7%and increased the anti-wear performance of composite coatings by about thirteen times.Nano-schistose MSH facilitated the formation of a friction-induced multi-layer heterogenous slipping structure with layered solid lubricants at the friction interface.Moreover,tribo-chemical reactions between nano-schistose MSH and worn surface promoted the in-situ formation of a cermet supporting film,and this also induced the gradual in-situ formation of a lubrication film on the top of worn surface.Consequently,the contact state between tribo-pairs was timely regulated and the invalidation of the nanocomposite slipping structure was effectively restrained during the friction process.As a result,the service life of the phosphate composite coatings was significantly extended and further abrasion on the worn surface was notably reduced.展开更多
文摘In the analysis of some in-seam slip fold structures in the area of Xuzhou and Huaibei Districta it is noted that there exist some in-seam roof and footwall rock layers extremely incompatible to the existence of coal seams. Some of them are tbe slip fold structures that are wedged into coal seam by folding, but all of them are passively generated by in-seam shearing forces. In this paper, a discussion is put forward of the damage to coal seams by slip folds and the coal mining significance resulted from the study of slip fold structures.
基金supported by Yunnan Major Scientific and Technological Projects(grant No 202202AG050004,202202AG050011)the National Natural Science Foundation of China(grant No 52061021)Yunnan Industrial Technology Innovation Talent Project.
文摘Many properties of Mg matrix composites are mutually incompatible,and even completely repel each other.Here,we constructed a magnetic layered component in Mg matrix composite reinforced with reduced graphene oxide(RGO)through an in-situ interface reaction strategy,achieving simultaneous improvement in the strength,ductility,and electromagnetic shielding performance of the composite.The magnetic component is generated by the in-situ reaction of Fe_(2)O_(3)nanoparticles encapsulated on RGO with the Mg matrix.The superior strength-ductility synergy originates from layered heterostructure,which actives non-basal dislocations and enables a stable microcrackmultiplication.The heterogeneous layered structure strengthens the multi-level reflection of electromagnetic wave(EMW)inside the composite.The in-situ interfacial reaction introduces abundant of heterogeneous interfaces into the composites,which improves the interfacial polarization loss ability of the composites.The magnetic RGO layer can provide shape anisotropy that breaks the Snoek limit,thus improving the magnetic loss ability of composite in high-frequency electromagnetic fields.The synergistic action of multiple EMW loss mechanisms improves the electromagnetic shielding performance of composite.The current study emphasizes the influence of interface structure on the mechanical and functional properties of composites,and presents a promising approach for the development of structure/functional integrated composites with enhanced properties.
基金Financial assistances of the National Key R&D Program of China(No.2022YFB3809000)the National Natural Science Foundation of China(No.52105228)the Defense Industrial Technology Development Program(No.JCKY2021130B038)were greatly appreciated.
文摘Magnesium silicate hydroxides(MSHs)with granular,schistose,and tubular morphologies were separately incorporated to enhance the tribological properties of phosphate/MoS_(2) composite coatings.The nano-schistose MSH demonstrated superior tribological performance due to its effective interactions with the worn surface and frictional synergies with solid lubricants.Incorporation of nano-schistose MSH decreased the friction coefficient of composite coatings by about 34.7%and increased the anti-wear performance of composite coatings by about thirteen times.Nano-schistose MSH facilitated the formation of a friction-induced multi-layer heterogenous slipping structure with layered solid lubricants at the friction interface.Moreover,tribo-chemical reactions between nano-schistose MSH and worn surface promoted the in-situ formation of a cermet supporting film,and this also induced the gradual in-situ formation of a lubrication film on the top of worn surface.Consequently,the contact state between tribo-pairs was timely regulated and the invalidation of the nanocomposite slipping structure was effectively restrained during the friction process.As a result,the service life of the phosphate composite coatings was significantly extended and further abrasion on the worn surface was notably reduced.
