A technique for fabrication of coated TiCN-based cermets with functionally graded structure

Konyashin, I.

doi:10.1016/s0263-4368(01)00058-0

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…Regarding the Ti(C,N)-based cermets, there are several examples in which a FGM structure is generated in the area near the surface using N and Co as metallic phase. The most commonly used method for this is the melt metal infiltration [8,9] or by diffusional processes induced by a reactive gas phase [6,10]. Techniques based on colloidal processing are proposed in this work, as the successful application of the colloidal techniques would allow the one-step shaping of the FGMs, without intermediated compaction steps such as preform fabrication, metal fusion or infiltration, or combined thermal cycles.…”

Section: Introductionmentioning

confidence: 99%

FGM stainless steel-Ti(C,N) cermets through colloidal processing

Escribano

García

Alvaredo

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Ti(C,N), Cermets, Colloidal processing, Functionally gradient material, SteelIn this work, the colloidal approach was used to promote a gradation in the composition of a cermet, based on the mixture of stainless steel and Ti(C,N) during powder consolidation into a bulk part. The colloidal processing of non-oxides in aqueous media requires an elevated control over the evolution of the surface chemistry of the powders, in order to obtain stable and high concentrated slurries of the mixture of metal/non-oxide ceramic. The advantage of those methods lies on the fabrication of complex microarchitectures where the second phases are intimately and homogeneously dispersed in the microstructure of the composite. Moreover, those techniques allow the processing of fine particles with low compressibility and flowability which difficult conventional powder metallurgical processing. The results shown in this work evidence the feasibility of obtaining continuous functionally graded materials (FGM) through slip casting in porous molds, as well as the relevance of the rheological properties of the composite slurries on the final characteristics of the material.

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Section: Introductionmentioning

confidence: 99%

FGM stainless steel-Ti(C,N) cermets through colloidal processing

Escribano

García

Alvaredo

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…Although there are a lot of studies available in the literature about coatings including Ti, B, C and N elements [1,27], there is not any reported study about the deposition of Ti-B-C-N-based coatings by thermo-reactive diusion (TRD) method. TRD process is relatively simple and requires no complex hardware, gives good bonding strength due to diusional high temperature chemical reactions [28]. Moreover the heat treatment of the steel substrates can be realized at the end of titanizing treatment without reheating.…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Boro-Titanized AISI 1040 Steel

et al. 2015

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In this study, boro-titanizing treatment was applied to AISI 1040 steel. In the coating treatment, steel samples were pre-boronized in a slurry salt bath consisting of borax, boric acid and ferro-silicon at 900• C for 2 h, then titanized by thermo-reactive deposition technique (TRD) in a powder mixture consisting of ferro-titanium, ammonium chloride, alumina and naphthalene at 1000• C for 14 h. The coated samples were characterized by Xray diraction analysis (XRD), scanning electron microscope (SEM), glow discharge optical emission spectroscopy (GDOES) and micro-hardness tests. Coated layer formed on the pre-boronized AISI 1040 steel was compact and homogeneous. X-ray studies showed that the phases formed on the steel surfaces are TiB2, TiC, TiN and Fe2B. The depth of the coating layer ranged from 3.41 ± 0.47 µm to 6.59 ± 0.51 µm, depending on treatment time. A higher treatment time resulted in a thicker boro-titanized layer. The average hardness of the coating layer was 4527 ± 284 HV0.005.

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“…With recent advances in materials processing technologies more and more multi-alloy systems with adaptive microstructures and properties are being developed [1][2][3][4][5]. On the other hand, multi-alloy, nanostructured multilayers have been shown to exhibit superior properties that cannot be achieved in their single alloy counterparts [6][7][8][9][10][11][12][13][14][15]. However, when two alloys of dissimilar compositions and microstructures are joined together and subjected to elevated temperature excursions interdiffusion will take place, leading to significant changes in alloy composition and microstructure in the vicinity of the joining interfaces.…”

Section: Introductionmentioning

confidence: 99%