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Title: Fire resistance properties of ceramic wool fiber reinforced intumescent coatings

Abstract

This research studied the effects of varied weight percentage and length of ceramic wool fiber (CWF) reinforcement to fire retardant performance of epoxy-based intumescent coating. Ten formulations were developed using ammonium polyphosphate (APP), expandable graphite (EG), melamine (MEL) and boric acid (BA). The mixing was conducted in two stages; powdered materials were grinded in Rocklabs mortar grinder and epoxy-mixed using Caframo mixer at low speed mixing. The samples were applied on mild steel substrate and exposed to 500°C heat inside Carbolite electric furnace. The char expansion and its physical properties were observed. Scanning electron microscopy (SEM) analyses were conducted to inspect the fiber dispersion, fiber condition and the cell structure of both coatings and chars produced. Thermogravimetric analyses (TGA) were conducted to study the thermal properties of the coating such as degradation temperature and residual weight. Fire retardant performance was determined by measuring backside temperature of substrate in 1-hour, 1000°C Bunsen burner test according to UL 1709 fire regime. The results showed that intumescent coating reinforced with CWF produced better fire resistance performance. When compared to unreinforced coating, formulation S6-15 significantly reduced steel temperature at approximately 34.7% to around 175°C. However, higher fiber weight percentage had slightly decreased fire retardantmore » performance of the coating.« less

Authors:
; ;  [1]
  1. Mechanical Engineering Department, Universiti Teknologi PETRONAS Bandar Seri Iskandar, 31750 Tronoh, Perak (Malaysia)
Publication Date:
OSTI Identifier:
22488632
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1669; Journal Issue: 1; Conference: SCMSM 2014: 23. scientific conference of Microscopy Society Malaysia, Tronoh (Malaysia), 10-12 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CHARS; ELECTRIC FURNACES; EPOXIDES; FIBERS; FIRE RESISTANCE; GRAPHITE; MELAMINE; MORTARS; PERFORMANCE; POWDERS; SCANNING ELECTRON MICROSCOPY; STEELS; SUBSTRATES; THERMAL GRAVIMETRIC ANALYSIS; THERMODYNAMIC PROPERTIES

Citation Formats

Amir, N., E-mail: norlailiamir@petronas.com.my, Othman, W. M. S. W., E-mail: wamosa@gmail.com, and Ahmad, F., E-mail: faizahmad@petronas.com.my. Fire resistance properties of ceramic wool fiber reinforced intumescent coatings. United States: N. p., 2015. Web. doi:10.1063/1.4919200.
Amir, N., E-mail: norlailiamir@petronas.com.my, Othman, W. M. S. W., E-mail: wamosa@gmail.com, & Ahmad, F., E-mail: faizahmad@petronas.com.my. Fire resistance properties of ceramic wool fiber reinforced intumescent coatings. United States. doi:10.1063/1.4919200.
Amir, N., E-mail: norlailiamir@petronas.com.my, Othman, W. M. S. W., E-mail: wamosa@gmail.com, and Ahmad, F., E-mail: faizahmad@petronas.com.my. Wed . "Fire resistance properties of ceramic wool fiber reinforced intumescent coatings". United States. doi:10.1063/1.4919200.
@article{osti_22488632,
title = {Fire resistance properties of ceramic wool fiber reinforced intumescent coatings},
author = {Amir, N., E-mail: norlailiamir@petronas.com.my and Othman, W. M. S. W., E-mail: wamosa@gmail.com and Ahmad, F., E-mail: faizahmad@petronas.com.my},
abstractNote = {This research studied the effects of varied weight percentage and length of ceramic wool fiber (CWF) reinforcement to fire retardant performance of epoxy-based intumescent coating. Ten formulations were developed using ammonium polyphosphate (APP), expandable graphite (EG), melamine (MEL) and boric acid (BA). The mixing was conducted in two stages; powdered materials were grinded in Rocklabs mortar grinder and epoxy-mixed using Caframo mixer at low speed mixing. The samples were applied on mild steel substrate and exposed to 500°C heat inside Carbolite electric furnace. The char expansion and its physical properties were observed. Scanning electron microscopy (SEM) analyses were conducted to inspect the fiber dispersion, fiber condition and the cell structure of both coatings and chars produced. Thermogravimetric analyses (TGA) were conducted to study the thermal properties of the coating such as degradation temperature and residual weight. Fire retardant performance was determined by measuring backside temperature of substrate in 1-hour, 1000°C Bunsen burner test according to UL 1709 fire regime. The results showed that intumescent coating reinforced with CWF produced better fire resistance performance. When compared to unreinforced coating, formulation S6-15 significantly reduced steel temperature at approximately 34.7% to around 175°C. However, higher fiber weight percentage had slightly decreased fire retardant performance of the coating.},
doi = {10.1063/1.4919200},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1669,
place = {United States},
year = {Wed Jul 22 00:00:00 EDT 2015},
month = {Wed Jul 22 00:00:00 EDT 2015}
}
  • The results of influence of glass fiber addition into the basic intumescent coating formulation towards the enhancement of its thermal insulation properties are presented. The intumescent coatings were formulated from expandable graphite, ammonium polyphosphate, melamine, boric acid, bisphenol A epoxy resin BE-188, polyamide amine H-2310 hardener and fiberglass (FG) of length 3.0 mm. Eight intumescent formulations were developed and the samples were tested for their fire performance by burning them at 450°C, 650°C and 850°C in the furnace for two hours. The effects of each fire test at different temperatures; low and high temperature were evaluated. Scanning Electron Microscope, X-Ray Diffractionmore » technique and Thermo Gravimetric Analysis were conducted on the samples to study the morphology, the chemical components of char and the residual weight of the coatings. The formulation, FG08 containing 7.0 wt% glass fiber provided better results with enhanced thermal insulation properties of the coatings.« less
  • Interfaces in SiC-fiber-reinforced glass-ceramic matrix composites were modified by applying different coatings to the fibers and varying the coating thickness. Coatings of SiC/BN, Si{sub 3}N{sub 4}/BN, and BN were applied to the fibers by CVD prior to composite fabrication. Interfacial microstructures were characterized using high-resolution and analytical transmission electron microscopy. Oxidation of the SiC fibers during composite fabrication was suppressed by the fiber coatings, provided that the coatings were sufficiently thick to prevent oxygen diffusion from the matrix. The SiC/BN and BN coatings were stable during high-temperature exposures, while the Si{sub 3}N{sub 4}/BN coating underwent chemical reactions.
  • A finite element technique is used to study the effects of coating properties on the deflection and penetration of cracks which terminate perpendicular to the fiber-coating or coating-matrix interfaces. Four types of coatings are considered for the SCS6 (fiber)-Zircon (matrix) composites. The hoop and tangential stresses and the energy release rates are analyzed for the various coatings. The effects of the thickness of coatings on these parameters are also studied. In general, no significant changes are found in stress ratio (ratio of hoop stresses along the crack and at the interface) and energy release rate ratio (ratio of energy releasemore » rates for the crack penetration and crack deflection), but the magnitudes of the stresses and energy release change substantially with the change in the coating thickness. Also, the effects of the coating properties on various stresses (except on the crack opening stress at the interface) and energy release rates are found to be the same irrespective of the relative modulus of the fiber and matrix.« less
  • The application of a mechanical properties microprobe to evaluate the interfacial properties of fiber-reinforced ceramic composites is addressed. The stress-displacement relation of the embedded fiber, which is subjected to an axial loading-unloading cycle, is analyzed. The interfacial bonding, Coulomb friction at the debonded interface, Poisson's effect of the loaded fiber, and residual stresses are included in the analysis, and closed-form analytical solutions are obtained. Based on the analytical solutions, a methodology is established to extract the interfacial properties from experimental stress-displacement curves. The roles of interfacial bonding, Poisson's effect, and residual axial stresses on the residual fiber displacement after completemore » unloading are also addressed in the presence study.« less