The existing static molding methods of ultra-high molecular weight polyethylene (UHMWPE) generally have the problems of long forming cycle, high energy consumption, easy thermal decomposition and so on, and the primary phase characteristic structure of their products has been completely eliminated, leading to failure in keeping good mechanical properties and excellent wear resistance at the same time. Therefore, UHMWPE products (PVM-UHMWPE) were prepared efficiently at low temperature by pulse vibration molding (PVM) technology in this paper, and the influence of pulse vibration frequency during molten hot pressing stage on structure and properties of UHMWPE products were studied. The results show that PVM can promote the interfacial fusion of particles at low molding temperature by friction between UHMWPE particles, and effectively preserve the structure characteristics of high regularity and crystallinity of nascent phase to increase the crystallinity and lamellae thickness. With the increase of pulse vibration frequency during molten hot pressing stage, the effect of pulse vibration increases, and this can improve the quality of particles interface consolidation. The yield strength, tensile modulus, break strength and work to failure of PVM-UHMWPE are all improved. However, when the frequency exceeds 3.0 Hz, the damage degree of such structure characteristics as high regularity and crystallinity of UHMWPE is aggravated by the effect of pulse vibration, and the overall crystallinity and melting temperature are reduced, resulting in the decrease of tensile modulus without further improving fracture toughness. As compared with sample CM-210 ℃-60 min with double molding cycle and 40 ℃ higher molding temperature, yield strength and tensile modulus of PVM-UHMWPE with a molding temperature of 170 ℃ and a pulsation frequency of 3.0 Hz (PVM-170 ℃-3.0 Hz) is improved by about 9% and 23%, respectively, and wear rate and wear index decrease by about 24% and 22%, respectively. That is, as compared with sample CM-210 ℃-60 min, sample PVM-170 ℃-3.0 Hz has higher mechanical strength and be-tter wear resistance.

As a new welding method, active tungsten argon arc welding (A-TIG welding), which increases weld pe-netration and improves welding efficiency by coating active agent on the surface of base metal, has been widely used in actual production. As one of the most common active flux formulations in A-TIG welding, oxide’s influence mechanism for arc behavior is still in debate. In order to clarify the influence mechanism of oxide on the arc beha-vior of TIG welding, a synchronous acquisition system of arc morphology and arc spatial spectrum was established. The spectral line distribution and arc morphology characteristics of active agent particles, argon, iron and other charged particles in the arc spatial space under the action of oxide were studied, and the arc electron temperature in different regions was calculated based on Boltzmann mapping method. It is found that the relative intensity of Ar Ⅱspectral lines in the arc space decreases gradually with the increase of the distance from the cathode region. This is because the closer the arc is to the cathode region, the more concentrated the arc energy density is, the more favo-rable it is to promote the ionization of Ar atoms. SiO₂ and B₂O₃ can promote the ionization of Ar particles, while TiO₂ can inhibit the ionization of Ar particles. The distribution law of the relative intensity of Fe Ⅱ spectral lines in the axial direction is opposite to that of Ar Ⅱ spectral lines. The relative intensity of the spectral lines gradually decreases from the vicinity of the anode region to the vicinity of the cathode region. This is because the closer it is to the surface of the molten pool (near the anode region), the higher the concentration of iron vapor evaporated into the arc space is and the more obvious the ionization is. The introduction of three kinds of oxide active agents can reduce the relative intensity of Fe Ⅱ spectral lines. In the arc space coated with TiO₂ active agent, no obvious Ti Ⅰcharacteristic line and arc contraction phenomenon were detected, and the arc temperature field did not change significantly, which means that the influence of TiO₂ active agent on the arc behavior is very weak. The characteristic spectral lines of Si Ⅰ and B Ⅰ were detected in the arc space coated with SiO₂ and B₂O₃ active agents, and the two active agents can cause arc contraction, but the arc contraction has no obvious effect on the arc temperature field.

In order to study the effect of solution temperature on the microstructure and properties of GH4099 alloy ring forgings, a heat treatment test was designed with solution treatment temperature of 1 080, 1 100 and 1 120 ℃, holding time of 1 h and aging treatment system was 900 ℃ and the holding time was 5 h. Then, the microstructure analysis and mechanical properties test were carried out. The effect of solution temperature on the microstructure and properties of GH4099 alloy ring forgings was investigated by SEM, EPMA, JMatPro software and mechanical experiment detection. The results show that, after the solid solution treatment at 1 080, 1 100 and 1 120 ℃, the average size of the γ′phase is 47.3, 48.5 and 49.3 nm, respectively, and the volume fraction is 30.1%, 31.0% and 29.9%, respectively. It can be seen that the solid solution temperature has little effect on the size, content and distribution of γ′phase. With the increase of solution temperature, the hardness of the alloy decreases. The granular M₂₃C₆ carbide in the crystal gradually dissolved with the rise of solid solution temperature. When the temperature reached 1 120 ℃, the M₂₃C₆ in the crystal almost completely dissolved. The fine and uniform grain can be obtained below 1 100 ℃; when the temperature is above 1 100 ℃, the grain size grows obviously, and the M₂₃C₆ carbide precipitate in a chain shape at the grain boundary after aging, which makes the grain boundary change from flat to curved. The curved grain boundary can effectively improve the rupture life of the alloy. The grain structure near the fracture of the durable specimens is elongated, and there are a lot of voids at the grain boundaries, which indicates that intragranular fracture is the main mechanism of crack initiation and propagation in the alloy. In addition, uneven internal texture and mixed crystal phenomenon occur in the alloy when solution treatment temperature is 1 120 ℃. Therefore, the best solution treatment temperature for GH4099 alloy ring forgings is 1 100 ℃.

With the advancement of science and technology, various intelligent electronic devices, electric vehicles and grid systems have grown rapidly, and people have a growing demand for high energy density and rechargeable battery systems. In the past few decades, the development of lithium-ion batteries has made great progress. Lithium-ion batteries consisting of positive and negative electrodes, electrolytes and separators has the danger of volatile and leakage, leading to short circuit, fire, explosion and other safety accidents. The emergence of solid electrolytes has largely eliminated this safety hazard. The solid-state electrolyte can not only separate the positive and negative electrodes in the battery to prevent internal short circuits, but also act as an ion conductor to achieve the dual role of lithium ion transfer between positive and negative active substances. The solid-state electrolyte has become one of the research hotspots in the field of new energy. At present, the preparation methods of solid electrolyte membranes mainly include organic solvent casting/coating or hot molding. Organic solvents used by these methods are not friendly to the environment and these methods have disadvantages like high manufacturing cost and low production efficiency. To solve this problem, this paper proposed a new method for preparing PEO-based composite solid electrolyte membrane based on tensile stress and solvent-free melting, characterized the crystalline morpho-logy and microscopic morphology of the electrolyte membrane by SEM and XRD, and characterized the thermal properties of the membrane by DSC and FT-IR. The electrochemical performance of the membrane was characte-rized by linear sweep voltammetry and conductivity test. The results show that, as compared with simple mechanical mixing, the PEO/LiTFSI/PVDF composite solid electrolyte membrane prepared based on tensile stress and solvent-free melting has better lithium salt dispersibility. Ionic conductivity test shows that, even the proposed method does not use organic solvents, it is still comparable to the ionic conductivity of electrolyte membranes prepared by the solution method. When the content of PVDF-HFP is 30%, the ionic conductivity of the PEO-based solid polymer electrolyte membrane at 60 ℃ reaches 2.07×10^-4 S/cm, and the electrochemical stability window is 5.0 V.