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Tippaban Palathai

King Mongkut's University of Technology Thonburi

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Narongrit Sombatsompop

King Mongkut's University of Technology Thonburi

Jirasak Tharajak

Rajamangala University of Technology Phra Nakhon

Ruangdaj Tongsri

National Science and Technology Development Agency

S. Raadnui

King Mongkut's University of Technology North Bangkok

Sithipong Mahathanabodee

King Mongkut's University of Technology North Bangkok

Parjaree Thavorniti

National Science and Technology Development Agency

Klong Luang

King Mongkut's University of Technology Thonburi

Kotchaphon Mangmesub

Sitthisuntorn Supothina

National Science and Technology Development Agency

Sasijuta Wattanarach

National Science and Technology Development Agency

Cooperative Institutions

King Mongkut's University of Technology Thonburi

National Science and Technology Development Agency

Thailand National Metal and Materials Technology Center

King Mongkut's University of Technology North Bangkok

Chulalongkorn University

Rajamangala University of Technology Phra Nakhon

Rajamangala University of Technology Isan

Technology Centre

The University of Tokyo

Materials Technology (United Kingdom)

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Effect of h-BN content on Tribological Behavior of PEEK Composite Coating

Jirasak Tharajak Tippaban Palathai Narongrit Sombatsompop

Low velocity oxy-fuel (LVOF) spraying technique was used to deposit PEEK and h-BN/PEEK powders onto the low carbon steel substrate. The effect of h-BN contents on surface roughness, hardness, degree of crystallinity, specific wear rate and friction coefficient was investigated. It can be found that top-surface roughness, hardness and degree of crystallinity increased with an increase in h-BN contents. The specific wear rate of the h-BN/PEEK composite coatings decreased as compared with the PEEK coatings. Increased h-BN content at 8 wt% exhibited the lowest friction coefficient.

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Scratch Resistance and Adhesion Properties of PEEK Coating Filled with h-BN Nanoparticles

Advanced materials research (2013)

Jirasak Tharajak Tippaban Palathai Narongrit Sombatsompop

Effects of h-BN particles on mechanical properties and adhesion of semi-crystalline poly (ether-ether-ketone) (PEEK) coatings were studied. PEEK powder was mixed with various contents of h-BN nanoparticle in ethanol under ultrasonic mixing. As-mixed powders were sprayed onto low carbon steel substrate with thermal spray technique. The hardness, scratch hardness, specific scratch wear rate, prevailing deformation mechanisms and adhesion were obtained from scratch tests by varying the applied load. The damage geometry on scratched polymer surfaces and scratch wear volume loss were examined using scanning electron microscope (SEM) and surface profilometer, respectively. The results indicated that the addition of h-BN content improved the hardness of the composite. In addition, the specific scratch wear rate and the adhesion between PEEK coatings and substrate decreased with increasing h-BN content. The poor adhesion resulted from the reductions of flow-ability and viscosity between PEEK and substrate caused by heat dissipation from the h-BN particles.

Scratch

Molding (decorative)

10.4028/www.scientific.net/amr.747.303

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Citations (5)

Effects of hexagonal boron nitride and sintering temperature on mechanical and tribological properties of SS316L/h-BN composites

Materials & Design (1980-2015) (2012)

Sithipong Mahathanabodee Tippaban Palathai S. Raadnui Ruangdaj Tongsri Narongrit Sombatsompop

Powder Metallurgy

10.1016/j.matdes.2012.11.038

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Citations (94)

Morphological and physical properties and friction/wear behavior of h-BN filled PEEK composite coatings

Surface and Coatings Technology (2015)

Jirasak Tharajak Tippaban Palathai Narongrit Sombatsompop

Polyether ether ketone

10.1016/j.surfcoat.2015.03.030

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Citations (44)

Dry sliding wear behavior of SS316L composites containing h-BN and MoS2 solid lubricants

Sithipong Mahathanabodee Tippaban Palathai S. Raadnui Ruangdaj Tongsri Narongrit Sombatsompop

Molybdenum disulfide

Dry lubricant

Powder Metallurgy

10.1016/j.wear.2014.04.015

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Citations (95)

Hardness, adhesion index and microstructure of PEEK coating on Al or Fe substrate by LVOF flame spray

Materials Science and Engineering A (2007)

Tippaban Palathai Jirasak Tharajak Narongrit Sombatsompop

10.1016/j.msea.2007.07.049

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Citations (28)

Purification of TiO2 from Leucoxene for the Synthesis of NIR-Reflective Cr-doped CaTiO3 Pigment

Chiang Mai Journal of Science (2022)

Kanyawee Sinmongkolkul Pattana Rakkwamsuk Tippaban Palathai Sasijuta Wattanarach Parjaree Thavorniti

This work aimed to explore the possibility of producing NIR-reflective pigment from Thai leucoxene which is an abundant mineral consisting of ~89 wt.% TiO2, 6 wt.% SiO2 and 5 wt.% other oxides such as Al2O3 and Fe2O3. The leucoxene was purified by selective leaching of undesired oxides with NaOH under hydrothermal condition. Effects of NaOH concentration, hydrothermal temperature and time were investigated. The results revealed that dissolutions of the SiO2 and Al2O3 increased with an increased NaOH concentration, while that of the ZrO2 and Fe2O3 remained the same, resulting in the increased TiO2 concentration. The SiO2 dissolution also increased with an increased temperature and time. The optimum leaching condition, i.e. 4 M NaOH, 180 °C and 60 min, yielded TiO2 content of 93.94 ±0.14 wt.%. The Cr-doped CaTiO3 pigments (CaCrxTi1-xO3; x = 0, 0.025, 0.05, 0.75 and 0.1), synthesized from the purified leucoxene, CaO and Cr2O3 by solid-state reaction at 1100 °C, exhibited brown color hue and NIR reflectance in a range of 34.5−59.8% depending on the Cr content. At the Cr content of 0.05, the pigment exhibited decent brownish appearance and modest NIR reflectance of 50.7% which was close to that of the pigment synthesized from pure rutile. The glaze consisting of 10 wt.% pigment had a glossy light brown appearance, and possessed NIR reflectance of 75.0 %, indicating a promising application in a field of NIR-reflective coating.

10.12982/cmjs.2022.008

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Recommendations for h-BN loading and service temperature to achieve low friction coefficient and wear rate for thermal-sprayed PEEK coatings

Surface and Coatings Technology (2017)

Jirasak Tharajak Tippaban Palathai Narongrit Sombatsompop

Polyether ether ketone

Service life

10.1016/j.surfcoat.2017.05.022

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Citations (44)

SOLID STATE REACTION DURING MECHANICAL ALLOYING AND HEATING OF MECHANICALLY ALLOYED NICKEL-TIN POWDERS

Kotchaphon Mangmesub Ruangdaj Tongsri Tippaban Palathai Klong Luang

Ni-Sn intermetallic compounds (IMCs) can be formed during mechanical alloying of blended Ni and Sn powders. However, with mechanical alloying times of up to 25 hours, formation of the intermetallic compounds was not governed by the blended Ni and Sn powder compositions but influenced by Ni/Sn interfacial reactions. Heating of the Ni-Sn powders mechanically-alloyed for 25 hours resulted in formation of intermetallic compounds having compositions with respect to nominal blended Ni and Sn powders compositions. By adjusting heating temperatures, porous Ni-Sn intermetallic compounds could be obtained. In addition, electrical conductivity of the Ni-Sn intermetallic compounds increased with increasing heating temperature.

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Comparative Studies on Wear Behaviour of Sintered 316L Stainless Steels Loaded with h-BN and MoS<sub>2</sub>

Advanced materials research (2013)

Sithipong Mahathanabodee Tippaban Palathai S. Raadnui Ruangdaj Tongsri Narongrit Sombatsompop

Mechanical properties and wear behavior of stainless steel embedded with different solid lubricants were investigated. Hexagonal boron nitride (h-BN) and molybdenum disulfide (MoS 2 )-embedded 316L stainless steels (SS316L/h-BN and SS316L/MoS 2 ) were prepared by powder metallurgy method. Various h-BN and MoS 2 contents (10, 15 and 20 vol%) were mixed with 316L stainless steel powders and then sintered at 1200°C in H 2 atmosphere for 60 min. The experimental results showed that small boride phase and h-BN powder occupied the pores in the microstructure of SS316L/h-BN composite whereas the MoS 2 second phase occupied the pores of the sintered 316L matrix in the microstructure of SS316L/MoS 2 composite. The addition of h-BN decreased the sintered density and hardness whereas that of MoS 2 gave the opposite effect. Dry sliding wear behavior of composites was investigated by using pin-on-disc test rig at the sliding speeds of 0.1 and 0.2 m/s and the applied load of 3 N. The results showed that the MoS 2 composites had higher wear resistance than the h-BN composite but the h-BN composite yielded a better friction reduction.

Molybdenum disulfide

Powder Metallurgy

10.4028/www.scientific.net/amr.747.307

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Citations (5)