Kurashiki Boring Kiko Co.

Kurashiki Okayama, Japan

Kurashiki Boring Kiko Co.

Kurashiki Okayama, Japan

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Wang J.,Kyushu Institute of Technology | Shibasaki S.,Kyushu Institute of Technology | Miyoshi N.,Kyushu Institute of Technology | Shinozaki N.,Kyushu Institute of Technology | And 2 more authors.
Surface and Coatings Technology | Year: 2014

A study of the effects of penetration treatments on plasma sprayed SUS316L stainless steel coatings was performed. The stainless steel coatings were sealed using multi-component oxides introduced at the conditions of 1273. K for 20. min, 1273. K for 45. min and 1373. K for 45. min. The effectiveness of the penetration was determined using an electron probe microanalyzer (EPMA). The results indicated that the molten multi-component oxides could seal the open pores near the stainless steel coating surface quickly and effortlessly due to the good wettability. The molten multi-component oxides could pass through the oxide path connected to the inter micro-pores smoothly and infiltrated into the stainless steel coating when the period of impregnation was prolonged to 45. min. The penetration became more effective with increasing temperature because of the reactions between the molten multi-component oxides and the original oxides that occurred in the stainless steel coating around the inter pores. The results of a salt spray test indicated that the penetration treatment could significantly improve the corrosion resistance of the stainless steel coating. © 2014 Elsevier B.V.


Zeng Z.,Kurashiki Boring Kiko. Co. | Kuroda S.,Japan National Institute of Materials Science | Kawakita J.,Japan National Institute of Materials Science | Komatsu M.,Japan National Institute of Materials Science | Era H.,Kyushu Institute of Technology
Journal of Thermal Spray Technology | Year: 2010

The oxidation behavior of iron binary powders with addition of Si (1, 4 wt.%) and B (1, 3 wt.%) and that of a Ni-Cr based alloy powder with Si (4.3 wt.%), B (3.0 wt.%), and C (0.8 wt.%) additions during atmosphere plasma spray (APS) have been investigated. Analysis of the chemical composition and phases of oxides in the captured in-flight particles and deposited coatings was carried out. The results show that the addition of Si and B to iron effectively reduced the oxygen contents in the coatings, especially during the in-flight period at higher particles temperature. Ni-Cr based alloy powder with Si, B, and C additions reduced the oxidation of the base alloys significantly. Preferential oxidation and subsequent vaporization of Si, B, and C from the surface of the sprayed particles are believed to play a major role in controlling oxidation in the APS process. © 2009 ASM International.


Era H.,Kyushu Institute of Technology | Hashimoto K.,Kyushu Institute of Technology | Sakoda N.,Kurashiki Boring Kiko Co. | Zeng Z.,Kurashiki Boring Kiko Co. | Sako S.,Kurashiki Boring Kiko Co.
Proceedings of the International Thermal Spray Conference | Year: 2015

A modified stainless steel coating, named as M-SUS here, was prepared by the air plasma spray process (APS) and the high velocity flame spray process (HVOF) and compared with a conventional stainless steel (JIS: SUS316L). Anodic polarization tests using NaCl, HC1 solutions, neutral salt spray test, and exposure test in actual tank for HC1 storage were employed for the evaluation of corrosion resistance. Structure of the coatings was investigated by use of optical microscope, scanning electron microscope, electron probe micro-analyzer, and transmission electron microscope. It was found that the coating M-SUS exhibited a remarkably superior corrosion resistance by all tests mentioned above, compared with the conventional ones. Although both of the coatings compose of gamma-austenite (. -Fe) and delta-ferrite (δ-Fe) phases, the coating M-SUS reveals much less oxide with chromium and more delta-phase enriched with molybdenum. Another exposure test using a mixed acid of 25%HNO3 and 75%HCl yielded that the δ-Fe was not etched out but the γ-Fe vanished, that is, the δ-Fe of M-SUS has a strong anti-corrosion property. It is considered that the superior corrosion resistance of coating M-SUS is attributed to the extensive formation of anti-corrosive δ-Fe and inhibition of chromium depletion resulting from oxide formation. © Copyright (2015) by ASM International All rights reserved.


Wang J.,Kyushu Institute of Technology | Shinozaki N.,Kyushu Institute of Technology | Zeng Z.,Kurashiki Boring Kiko Co. | Sakoda N.,Kurashiki Boring Kiko Co. | Fukami N.,Taiko Refractories Co.
Applied Surface Science | Year: 2015

A study of the penetration treatment of plasma sprayed SUS316L stainless steel coatings by moltenMnO-SiO2oxides with near-eutectic composition was performed. The penetration treatment wasintroduced at 1353 K for 5, 20, and 45 min, and the effectiveness of the penetration and the underly-ing mechanisms of interfacial reactions are discussed on the basis of structural observation (EPMA),high-temperature wetting measurements and further supported by a thermodynamic calculation andanalysis. The results indicated that at 1353 K, the MnO-SiO2oxides could infiltrate into the stainlesssteel coating within a depth of approximately 100 μm within 5 min due to the very good wettability ofthe stainless steel coating by molten MnO-SiO2oxides. The oxide could further penetrate to the coat-ing/substrate interface when the treatment was extended to 20 min. During the penetration into thecoating, a reaction between the MnO-SiO2oxides and adjacent stainless steel particles occurred, whichproduced MnCr2O4 crystalline particles characterized by a spinel structure. As a result, a variation of theMnO-SiO2oxides composition was observed. © 2014 Elsevier B.V. All rights reserved.


Sakamoto S.,Yokohama National University | Kano T.,Yokohama National University | Yamaguchi M.,Yokohama National University | Arakawa S.,Kurashiki Boring Kiko Co. | And 3 more authors.
Advanced Materials Research | Year: 2013

We examined the slicing technique of silicon wafers with little kerf loss using an ultrafine wire tool. As the first step, we performed microgrooving with an ultrafine wire tool. The thinning of the wafer and the decrease in kerf loss can minimize production costs. We discuss the strength characteristics and the microgrooving performance of the ultrafine wire tool. The main results are as follows. The relative velocity greatly affects the grooving properties. The ultrafine wire tool easily breaks when the relative speed is high. When the ultrafine wire tool and abrasives with large diameter grains are used, the ultrafine wire easily breaks and chipping in the work material easily occurs; furthermore, the ultrafine wire strays. © (2013) Trans Tech Publications, Switzerland.


Patent
Kurashiki Boring Kiko Co. | Date: 2014-11-06

A method for producing an internal member of a dry etching chamber by forming an yttria coating on the member. With H_(2 )gas and Ar gas used as working gases, Ar gas and H_(2 )gas are supplied to a plasma spray apparatus so the flow-volume ratio of Ar gas to H_(2 )gas is 6 to 8 with a flow rate of Ar gas set to 60 to 75 liters/min to increase the flow rate of Ar gas with respect to a flow rate of H_(2 )gas, so that the speed of a plasma jet is increased and the temperature of the plasma jet is decreased, then yttria fine powder having a particle size of 10 to 20 m is introduced as a powder material to the plasma jet, and the plasma jet containing molten yttria fine powder is sprayed onto the surface of the member.

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