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Mali, V. I.; Kalinin, A. N.; Сергеев, С. А.

doi:10.1023/a:1022113722383

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The high diffusivity of the liquid phase can provide rapid densification and grain growth during sintering. [27] Therefore, reducing the number of internal pores of the materials and improving the density of the materials are the keys to prepare high-quality Mo/W-Cu composites. [28] At present, the commonly used preparation methods of Mo/W-Cu composites include melting infiltration method [14,29] and powder metallurgy method.…”

Section: Densification Mechanisms Of Mo/w-cu Compositesmentioning

confidence: 99%

“…[38,[47][48][49] As mentioned above, ultrafine and uniformly dispersed powder can improve the sintering performance of the system. [27] The more grain boundaries and interfaces there are, the more electron scattering will increase and the motion of electrons will slow down, thus reducing the conductivity. [49] The contact area between molybdenum and copper in core-shell structure also increases.…”

Section: Increased Surface Energy Densificationmentioning

confidence: 99%

“…In high current electrons, Cu matrix composites containing Mo inclusions were used for arc discharge. [ 27 ] In many switches, the electrode plate is an important part of the contact system. For this part, different switches will choose different materials for better performance.…”

Section: Interface Bonding and Bonding Mechanismsmentioning

confidence: 99%

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Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

et al. 2023

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Molybdenum (Mo) and tungsten (W) are elements of the same family with similar properties, and both of them have high hardness, mechanical strength, and electrochemical corrosion properties, [1] which are widely used in the research and application of hightemperature and arc ablation-resistant materials. [2,3] Mo-Cu and W-Cu alloys are typical pseudoalloys. [4] There is almost no reaction between tungsten and copper, molybdenum and copper in the sintering process, and almost no intermetallic compounds are produced, which is due to the great differences in crystal structure and physical properties between tungsten and copper particles, molybdenum and copper particles. [5,6] W-Cu alloys and Mo-Cu alloys are widely used in microelectronics applications, aerospace technology, and military equipment because of their excellent electrical conductivity, excellent thermal conductivity, excellent arc resistance, flame retardant of fused joints, and other attractive properties. [1,[7][8][9] The addition of Cu and other high thermal conductivity (TC) metals can make it have a thermal expansion coefficient (CTE) close to silicon and high TC. [7][8][9][10][11][12][13] When the service temperature exceeds the melting point of Cu, Cu in the material can absorb a lot of heat through the transformation of physical states such as liquefaction and evaporation, and play a role of sweating and cooling. [9] As a result, Mo/W-Cu composites (Mo-Cu and W-Cu) have excellent high-temperature resistance and better ablation resistance than pure metal Mo/W. [14][15][16][17] Mo/W-Cu composites have excellent physical and mechanical properties, but their applications are severely limited by density and interface problems. Densification and interface strengthening can improve mechanical, thermal, and electrical properties of Mo/W-Cu composites. The electrical and thermal properties of Mo/W-Cu composites are closely related to the addition of alloying elements, [6] densification of green compacts, [18,19] thermal cycle, [20] and applied pressure in the case of hot pressing. [21] At present, the study in the densification of Mo/W-Cu composites is almost about the influence of a single factor, and there is no comprehensive summary of the densification process. In the experimental process, there are also considerable difficulties in fully characterizing the microstructure, atomic structure, and chemical properties of the interface, which can be described by creating molecular dynamics models. However, there are few researches on molecular dynamics simulation of Mo/W-Cu composite.Mo/W-Cu composites are an attractive radiator material due to their combinational properties of Mo/W and Cu. [22] However, Mo/W-Cu composites materials are widely distributed in

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Section: Densification Mechanisms Of Mo/w-cu Compositesmentioning

confidence: 99%

Section: Increased Surface Energy Densificationmentioning

confidence: 99%

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Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

et al. 2023

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Effect of the metal structure on the loss of stability of a thin plate separating a powder compressed by a shock wave

Киселев

Mali

2010

Combust Explos Shock Waves

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Results of an experimental and theoretical study of the problem of shock-wave compaction of a metallic powder enclosed into a metallic container with a transverse partition are presented. It is demonstrated that internal stresses in the partition generate disturbances, which evolve under explosive loading and compression of the partition together with the powder. In addition to the loss of stability in the powder, which occurs owing to filling of voids, wave formation on the partition is observed.

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Effect of Wave Formation during Shock-Wave Compaction of Powders

Киселев

2006

J Appl Mech Tech Phys

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S. P. Kiselev and V. P. KiselevThe problem of shock-wave compaction of a metal powder enclosed in a metal container with a transverse partition is solved. A model of wave formation on the partition and in the compact adjacent to the partition is proposed; the model is based on the loss of strength in the powder due to collapsing of pores and to development of instability of the partition being compressed in the shock wave.Introduction. Shock-wave compaction of powders is widely used for obtaining materials with prescribed properties [1-3]. One of the drawbacks of this method is origination of various inhomogeneities in the compact. For instance, compaction of a powder with a "central body" leads to formation of a "cold" layer in the compact [3]; the reasons for origination of this layer were considered in [3][4][5].The experiments performed in [6] revealed a new type of inhomogeneities, which arise in shock-wave compaction of a copper powder in a cylindrical ampoule with transverse partitions made of transformer steel. The inhomogeneities were related to wave formation in transverse partitions and in adjacent layers of compacts. Additional experiments showed that the effect of wave formation after shock-wave loading was not observed if the ampoule was filled by a solid copper sample instead of the copper powder. The effect was not observed either if the transverse partitions were made of materials other than transformer steel (copper, aluminum, stainless steel, or steel St. 20). Results of numerical simulations of powder compaction in an ampoule with a transverse partition are described in the present paper; based on these results, an explanation for the wave-formation phenomenon is proposed.Formulation of the Problem. Figure 1 shows the schematic of powder compaction used in the experiment of [6], which was numerically simulated in the present work (in contrast to [6], only one partition is considered here, but this difference is not of principal importance). A cylindrical steel shell was filled by a copper powder (or by a mixture of copper and molybdenum powders), which was densely packed. Transverse partitions, which were thin circular plates, divided the powder into several portions for technological purposes. Powder compaction proceeded in a shock wave generated by a detonation wave excited by detonation of a high explosive (HE) on the shell surface. It turned out after compaction that wavy deformation of the partitions and adjacent compact was observed if the partitions were made of transformer steel (see Fig. 1).The effect of detonation products was simulated by pressure applied to the upper boundary of the shell P (x, t). The pressure at the detonation-wave front x = Dt was found from the Chapman-Jouguet condition [7] by the formula P H = (2/(γ + 1))ρ HE D 2 , where ρ HE is the density of the high explosive, D is the detonation velocity, and γ = 3. Behind the detonation-wave front, the pressure decreases in the centered expansion wave Dt/2 < x < Dt with an adjacent region 0 < x < Dt/2, where the pressure ...

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Untitled

Cited by 3 publications

References 5 publications

Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

Effect of the metal structure on the loss of stability of a thin plate separating a powder compressed by a shock wave

Effect of Wave Formation during Shock-Wave Compaction of Powders

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