Compositions without noble metals for thick film gas sensor heater fabrication

Dyshel, D. E.; Yeremina, L.; Tel’nikov, E. Ya.; Rud, B. M.

doi:10.1016/s0925-4005(97)80062-7

Cited by 8 publications

(3 citation statements)

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“…The three main peaks of the coating (2θ = 44.5°, 51.8°, and 76.4°) were mainly solid solution γ-Ni, which belongs to the Fm-3m space group, and the three diffraction peaks correspond to the (111), (200), and (220) crystal planes. During laser cladding, Ni, B, and Si elements in the high-temperature molten pool could form nickel boride and nickel silicide, and Cr and C could form chromium carbide [ 21 , 22 , 23 ]. 3Ni + B → Ni 3 B 23Cr + 6C → Cr 23 C 6 2Ni + Si → Ni 2 Si …”

Section: Resultsmentioning

confidence: 99%

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Wang

Ouyang

et al. 2022

Materials

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To improve the surface corrosion resistance of ductile iron, Ni-based alloy coatings were prepared using a high-speed laser cladding technology with different levels of laser power. The microstructure, phases, and corrosion properties of the coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and an electrochemical workstation. Variations in laser power did not change the main phases of the coatings, which were composed of γ-Ni, Ni3B, Ni2Si, and Cr23C6. With an increase in power, the degree of segregation in the coating decreased, sufficient melting between elements was achieved, and the chemical composition became more uniform. Enhancement of the laser power resulted in more energy being injected into the cladding, which allowed adequate growth of tissue, and dendrites continued to grow in size as the power increased. The self-corrosion potentials of the coatings at laser power levels of 1.6, 2.0, and 2.4 kW were −625.7, −526.5, and −335.7 mV, respectively. The corrosion potential of the 2.4 kW coating was the highest, and the corroded surface of the cladding layer included mainly sizeable continuous structures with a light degree of corrosion and the highest corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Wang

Ouyang

et al. 2022

Materials

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“…We examined LaB 6 -based TFRs containing 40 wt.% of glassy bond produced by screen printing of pastes on an alumina ceramic substrate and subsequent thermal treatment in a PÉK-8 conveyor-type furnace as described in [11]. The resistors were 30 to 35 μm thick.…”

Section: Methodsmentioning

confidence: 99%

Laser processing of LaB6-based thick film resistors

Паустовский

Rud

Shelud’ko

et al. 2008

Powder Metall Met Ceram

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The paper studies the effect of laser processing on the structure and electrophysical properties of LaB 6 -based thick film resistors (TFR). The phases and structure of the composition are investigated. The exposure to micro-and nanosecond pulses, unlike millisecond ones, is shown to insignificantly increase the electrical resistance of the film and to aid in forming more uniform and fine TFR structure. LaB 6 -based TFRs are more resistant to long-term exposure to nanosecond laser radiation than BaB 6 -and (BaB 6 -LaB 6 )-based ones.

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“…This method to describe correlation only slightly disturbs the primeval Bloch states and cannot show the fundamental modification of the energy spectrum upon changes in the external conditions for materials containing configurationally unstable atoms, because this method corresponds to the Thomas-Fermi approximation, which conceals the chemical peculiarities of atomic structure [3]. More advanced one-particle approaches based on the density functional principles have been sought in recent years [32][33][34] in parallel with attempts to extend the configuration approach to more complex structural states [35][36][37].…”

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confidence: 99%

Configuration model of matter and its role in theoretical science of materials

Pryadko

Ristić

2008

Powder Metall Met Ceram

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621.762The major principles of Samsonov's quasichemical configuration model are discussed in terms of the many-electron theory of condensed systems. It is shown that the interrelation between the order of the sand d-levels in isolated atoms of transition elements and the occupation of the corresponding bands in metals can be interpreted with quasiparticle theory that takes the d-d-and s-d-electronic correlations into account more accurately than ordinary one-electron theory does.The 30 years separating us from Grigorii Samsonov permit an objective assessment of his activity, which deeply influenced the technology of the last century. However, our view of Samsonov's personality is not fully comprehended yet. The universality of the scientist and his multidisciplinary studies intended to lay the foundation for the science of materials escape our notice -each one sees only his own piece of the puzzle.Understanding the scientific development as the interaction of two principles (cognizable and practical platonic ideas) clarifies the major trend in the evolution of the Doctrine of Materials: transition from the Science of Substance to the Engineering of Materials and then to the Science of Materials.The transition to the science of materials has not been completed so far (the doctrine of materials is distinctively eclectic, which is evidenced even by concepts and terminology). Therefore, Samsonov's approach to turn technology from arts into science (studying how technology influences the classical composition−structure−properties triad) is still relevant. Since the final state is formed ambiguously in irreversible processes, and functional links are changed in nonequilibrium states (under external influences), the fundamental triad may transform into tetrads such as technology−composition−structure−properties (synthesis) or composition−structure−technology−properties (material processing).In the same context, we can state that Samsonov's configurational model of matter resulted from the new insight into the composition−structure−properties triad. Rising to a higher level of sophistication about the elementary nature of matter -from the concept of matter consisting of chemical elements (described by newtonian mechanics) to the concept of matter consisting of elementary particles (described by quantum mechanics) -fundamentally modified the notions of composition, structure, and properties and relations between them, which still fall into the new ab initio triad: particles−fields−interactions.As electron theory evolved as the basis of physical materials science for transition metals (and their alloys and compounds), dealing with the apparent inconsistency between the quantum chemical and quantum physical descriptions of matters and materials was becoming more and more important. The components of the fundamental compositionstructure-properties triad are expressed at the electronic level in terms of two alternative models: atomic orbitals (formation of phases and structures) and one-electron bands (effect of structure on ...

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Compositions without noble metals for thick film gas sensor heater fabrication

Cited by 8 publications

References 0 publications

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Laser processing of LaB6-based thick film resistors

Configuration model of matter and its role in theoretical science of materials

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