Colloidal approach for the design of Ti powders sinterable at low temperature

Neves, R.G.; Ferrari, B.; Sánchez-Herencia, Antonio Javier; Gordo, E.

doi:10.1016/j.matlet.2013.05.015

Cited by 14 publications

(16 citation statements)

References 14 publications

(14 reference statements)

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“…Fig. 5a shows the kinetics of nano-TiN deposition for times lower than 180 s (3 min) when using stain- less steel AISI 316L (SS316L) and AISI304 (SS304) substrates and Ti substrates fabricated by pulvimetallurgy (PM) techniques [42]. Stainless steel surfaces are polished while Ti substrates have an asprepared surface.…”

Section: Epd Of Steric Stabilized Nano-tin Suspensionsmentioning

confidence: 99%

Improvement of TiN nanoparticles EPD inducing steric stabilization in non-aqueous suspensions

Mendoza

González

Castro

et al. 2016

Journal of the European Ceramic Society

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Abstract:In this work, the process parameters involved in the electrophoretic deposition (EPD) to obtain thin TiN films was studied and optimised. The stability of commercial TiN nanopowder in isopropyl alcohol adding a cationic polymer (polyethylenimine) as dispersant, with different molecular weights, was investigated to determine the kinetics of the deposition and to reach the most efficient EPD process. Cathodic EPD was performed over electro-polished stainless steel substrates. It was found that the provided dispersion when the PEI with the highest molecular weight was added to the suspension, leads to the best deposition behaviour for short times. New flocculation phenomena were described which affect to the sticking factor, and thus to the evolution of the EPD kinetics. As a result of the designed stabilization system, a reliable and versatile EPD method to produce well consolidated nano-TiN coatings at 1200• C in vacuum atmosphere was described.

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Section: Epd Of Steric Stabilized Nano-tin Suspensionsmentioning

confidence: 99%

Improvement of TiN nanoparticles EPD inducing steric stabilization in non-aqueous suspensions

Mendoza

González

Castro

et al. 2016

Journal of the European Ceramic Society

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“…[27] Eventually, according to Bockstiegel, [28] the interest shifted more towards an analytical problem-finding a simple but adequate mathematical description for experimentally observed compaction curves. [1,2,[6][7][8][9][10][11][12][13][14] The compaction curves for ITP-produced Ti, [12] CSIR-produced Ti, [8] Ho¨gana¨s AB produced Ti and TiH 2 , [13,17] Armstrong produced Ti and Ti-6Al-4V, [14,17] spray-dried powders, [20] for example, have also been reported Comparing the compressibility of different powder CP-Ti, sponge, HDH, and various Ti-6Al-4V powder mixtures (up to 1200 MPa) several researchers, see Refs. 1, 2, 6 through 9, 11 through 13, and 17 for example, have also studied and compared the compaction behavior of different Ti powder.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Some noteworthy findings from literature are summarized in Table I. According to Table I, many research articles have reported on the compressibility behavior of titanium powders [1,2,[6][7][8][9][10][11][12][13][14]17,20,22,25] ; evidently, only a very few have paid particular attention to the analysis of the cold compaction behavior of titanium powders using existing or new compaction equations, see References 10,12,14,22, and 25 for example. Those that have, for unspecified reasons, have selectively applied only a few models.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Cold Compaction Behavior of Titanium Powders: A Comprehensive Inter-model Comparison Study of Compaction Equations

Machaka

Chikwanda

2015

Metall Mater Trans A

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A brief background to compaction equations and their application to titanium powder is presented. The behavior and mechanisms of densification in selected titanium powders is critically analyzed by means of a comprehensive inter-model comparison of existing compaction equations. The results are discussed in terms of the comparative evaluation of cold uniaxial compaction tests of sponge Ti, CP TiH 2 , CP Grade 2 Ti, and TiH 2 -SS316L nanocomposite powder samples, which were conducted at applied compaction pressures of up to 1250 MPa.

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“…The spraydrying technique allows for the designing of Ti granules that are able to flow and to be processed by conventional PM techniques. Neves et al [17,18] reached a sintering density of approximately 96 % of the theoretical value through this method.…”

Section: Introductionmentioning

confidence: 84%

“…i) Polyacrylic acid (PAA, Mw=2000 g/mol, Acros Organics, USA), prepared in an tetramethylammonium hydroxide (HTMA) solution at pH 10, which was previously used in Neves et al [17,18]. …”

Section: Methodsmentioning

confidence: 99%

Role of stabilisers in the design of Ti aqueous suspensions for pressure slip casting

et al. 2014

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Colloidal processing has long been used in ceramics to achieve green bodies with high densities, complex shapes and homogeneous microstructures, but they are rarely used to shape metal powders because of their high density and high surface reactivity. However, the possibility of processing fine particles makes these techniques interesting for metals, such as titanium, with a low density and high melting point. This work presents encouraging results in the design of aqueous suspensions of Ti particles to be shaped into bulk pieces by pressure slip casting (PSC), which opens new paths for the processing of fine and complex microstructures. Ti powders, measuring 10 µm in size, and mixtures of Ti and Al2O3 powders (added up to 5 wt.%) were dispersed in water by the addition of different stabilisers. The influence of the stabilisers in the slurry behaviour (in terms of nature, stereochemistry and active functional groups) was determined, as well as the incorporation of ceramic particles. A polyacrylic-based dispersant was selected as the best stabiliser to incorporate a second component (Al2O3) into the Ti suspension, whereas shear-thinning additives, such as TIRON, are preferred for PSC shaping. Suspensions with 1 wt.% Al2O3 were selected for processing composites by PSC and sintering. Sintered materials were characterised by measuring the density, oxygen content, hardness and *Abstract microstructure analysis by SEM. Ti bulk pieces with 97 % density and fine and homogeneous microstructure, of which the relationship between the oxygen content and hardness agrees with that measured for CPTi grade 4 (249±24 HV30), can be processed by PSC. KeywordsPowder processing, Rheology, Composites, Titanium, Colloidal Processing AbstractColloidal processing has long been used in ceramics to achieve green bodies with high densities, complex shapes and homogeneous microstructures, but they are rarely used to shape metal powders because of their high density and high surface reactivity. However, the possibility of processing fine particles makes these techniques interesting for metals, such as titanium, with a low density and high melting point. This work presents encouraging results in the design of aqueous suspensions of Ti particles to be shaped into bulk pieces by pressure slip casting (PSC), which opens new paths for the processing of fine and complex microstructures. Ti powders, measuring 10 µm in size, and mixtures of Ti and Al2O3 powders (added up to 5 wt.%) were dispersed in water by the addition of different stabilisers. The influence of the stabilisers in the slurry behaviour (in terms of nature, stereochemistry and active functional groups) was determined, as well as the incorporation of ceramic particles. A polyacrylic-based dispersant was selected as the best stabiliser to incorporate a second component (Al2O3) into the Ti suspension, whereas shear-thinning additives, such as TIRON, are preferred for PSC shaping. Suspensions with 1 wt.% Al2O3 were selected for processing composites by PSC and sintering. Sinter...

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Colloidal approach for the design of Ti powders sinterable at low temperature

Cited by 14 publications

References 14 publications

Improvement of TiN nanoparticles EPD inducing steric stabilization in non-aqueous suspensions

Improvement of TiN nanoparticles EPD inducing steric stabilization in non-aqueous suspensions

Analysis of the Cold Compaction Behavior of Titanium Powders: A Comprehensive Inter-model Comparison Study of Compaction Equations

Role of stabilisers in the design of Ti aqueous suspensions for pressure slip casting

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