Preparation of moisture curable polysilazane coatings

Bauer, Frank; Decker, Ulrich; Dierdorf, Andreas; Ernst, H.; Heller, Roswitha; Liebe, Hubert; Mehnert, R.

doi:10.1016/j.porgcoat.2005.02.006

Cited by 166 publications

(63 citation statements)

References 11 publications

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“…Polymer derived ceramic (PDC) composite coatings are promising candidates to be used as alternative environmental barrier coatings for corrosion and oxidation protection of metals [12]. A new approach based on development of oxidation resistant PDC coating systems through pyrolysis of suitable predominantly silicon containing precursors such as polysiloxanes [13], polycarbosilanes [14] or polysilazanes [15,16,17], which could act as a diffusion barrier to oxygen was reported. The precursor techniques facilitate relatively low-cost and easy approach to produce polymeric and ceramic coatings, which in turn provide excellent oxidation and corrosion protection of metal substrates.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Parchovianský¹

2018

Ceramics - Silikaty

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Section: Introductionmentioning

confidence: 99%

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Parchovianský¹

2018

Ceramics - Silikaty

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“…Bauer et al [10] studied the influence of temperature, relative humidity, and relative humidity of an ammonia-containing atmosphere on the curing time of PHPS. Their studies revealed that the curing reaction relies mainly on the activation of Si-H and Si-N bonds by OH group containing substances such as water, which promotes subsequent cross-linking of intermediate silanols via condensation reactions.…”

Section: Introductionmentioning

confidence: 99%

Structural Study of Silica Coating Thin Layers Prepared from Perhydropolysilazane: Substrate Dependence and Water Penetration Structure

et al. 2016

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Abstract:The structure of perhydropolysilazane (PHPS)-derived silica (PDS) waterproof thin layers synthesized by curing at 60 • C for 1 h and allowed to stand for 48 h at 20 • C on various kinds of substrates was studied. Neutron reflectivity (NR) analysis suggested that uniform PDS thin layers were synthesized on the substrates, and the density of the layers varied depending on the type of substrate. Additionally, since the change in PDS density is correlated with the pK a value of the OH group on the substrate, it can be suggested that the acidity of the substrate would be one of the main factors determining the density of the coated PDS thin layers. For the water penetration structure study, NR analysis revealed that the depth of water penetration into the PDS layers was below 500 Å, and the hydration number of the SiO 2 molecule was estimated to be 8.0-9.0. From these results, we concluded that water penetration occurred by the formation of water-pool structures in the PDS layers, and the randomly formed nano-air holes lead to a reduction in the probability of water penetration into the deep regions of the PDS layers.

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“…Double layers prepared by this technique allowed the realization of OTRs of 0.1 cm 3 m À2 day À1 bar vestigated. [19,20] PHPS is an inorganic oligomer (M n = 600-2000 g mol…”

mentioning

confidence: 99%

“…In a subsequent thermally triggered condensation process, preferably in the presence of a base, [19,20,22] the intermediary formed silanol groups are transformed into an SiO x network, rendering this approach quite similar to a standard sol-gel process. An alternative route for converting PHPS into SiO x involves its vacuum ultraviolet (VUV) irradiation [23] in the presence of oxygen.…”

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confidence: 99%

Conversion of Perhydropolysilazane into a SiO_x Network Triggered by Vacuum Ultraviolet Irradiation: Access to Flexible, Transparent Barrier Coatings

Prager¹,

Dierdorf²,

Liebe³

et al. 2007

Chemistry A European J

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110

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The photochemical conversion of 200-500 nm layers of perhydropolysilazane --(SiH2-NH)n-- (PHPS) in the presence of oxygen into an SiOx network was studied. Different UV sources in the wavelength range of 160-240 nm, that is, 172 nm Xe2* and 222 nm KrCl* excimer, and 185 nm Hg low-pressure (HgLP) lamps were used for these purposes. The role of both ozone and O(1D) as well as of catalytic amounts of tertiary amines in the degradation process of PHPS and the formation of SiOx were studied. In this context, the kinetics of the entire reaction were elucidated and allowed both a continuous and discontinuous process to be established for the production of fully transparent, flexible barrier coatings. Barrier improvement factors (BIFs) of 400 were achieved with one single layer on 23 microm poly(ethyleneterephthalate) (PET), which translated into oxygen transmission rates (OTRs) of 0.20 cm3 m(-2) day(-1) bar(-1). Double layers prepared by this technique allowed the realization of OTRs of or=800.

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Preparation of moisture curable polysilazane coatings

Cited by 166 publications

References 11 publications

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Structural Study of Silica Coating Thin Layers Prepared from Perhydropolysilazane: Substrate Dependence and Water Penetration Structure

Conversion of Perhydropolysilazane into a SiO_x Network Triggered by Vacuum Ultraviolet Irradiation: Access to Flexible, Transparent Barrier Coatings

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Preparation of moisture curable polysilazane coatings

Cited by 166 publications

References 11 publications

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Corrosion and Oxidation Behavior of Polymer Derived Ceramic Coatings With Passive Glass Fillers on Aisi441 Stainless Steel

Structural Study of Silica Coating Thin Layers Prepared from Perhydropolysilazane: Substrate Dependence and Water Penetration Structure

Conversion of Perhydropolysilazane into a SiOx Network Triggered by Vacuum Ultraviolet Irradiation: Access to Flexible, Transparent Barrier Coatings

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Conversion of Perhydropolysilazane into a SiO_x Network Triggered by Vacuum Ultraviolet Irradiation: Access to Flexible, Transparent Barrier Coatings