scholarly journals High voltage powder spray coating as a new method for the preparation of carbon-titania coated stainless steel

2017 ◽  
Vol 13 (4) ◽  
pp. 812-816
Author(s):  
Farah Syuhada Abdul Halim ◽  
Sheela Chandren ◽  
Madzlan Aziz ◽  
Leaw Wai Loon ◽  
Hadi Nur
Keyword(s):  
Stainless Steel ◽  
High Voltage ◽  
Simple Technique ◽  
Spray Coating ◽  
Nitrogen Atmosphere ◽  
Adhesion Test ◽  
Tio2 Sample ◽  
Polymer Powder ◽  
No Weight Loss ◽  
Peel Adhesion

High voltage powder spray coating (HVPSC) is one of the methods used for coating substrate with polymer powder in industries. This study utilizes HVPSC as a new deposition method of carbon-based powdered materials on stainless steel. Carbon-titania (C/TiO2) coated stainless steel was successfully prepared from the mixture of epoxide and titania powder, sprayed onto stainless steel plate using HVPSC, followed by pyrolysis at 300 °C under nitrogen atmosphere. The functional group of C/TiO2 was confirmed by Fourier transform infrared (FTIR) spectroscopy, where the FTIR spectrum showed the presence of C─H sp3, C═O, C─O, and Ti─O peaks. The morphology of the C/TiO2 sample studied using field emission scanning electron microscopy (FESEM) clearly shows that the particles of TiO2 were coated with carbon on their surface.  The coating performance was evaluated through the abrasion test and showed no weight loss. Adhesion of C/TiO2 coating was also tested in the peel adhesion test and the result showed that the attachment of C/TiO2 on the stainless steel is very strong. It has been proven that the HVPSC method is not only a simple technique to coat materials but also a very durable one

Hybrid elevated-temperature, low/high-voltage plasma immersion ion implantation of AISI304 stainless steel

2001 ◽  
Vol 135 (2-3) ◽  
pp. 178-183 ◽  
Author(s):  
X.B. Tian ◽  
Y.X. Leng ◽  
T.K. Kwok ◽  
L.P. Wang ◽  
B.Y. Tang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Ion Implantation ◽  
High Voltage ◽  
Plasma Immersion Ion Implantation

Cyclone Maintenance Improvement via Special Refractory Anchor Pin Studs

2004 ◽  
Author(s):  
Stephen R. Swartz
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Thermal Cycling ◽  
Thermal Spray ◽  
Effective Means ◽  
Protective Layer ◽  
Spray Coating ◽  
Cycle Performance ◽  
Alloy 625 ◽  
430 Stainless Steel

Since the inception of the cyclone style boiler, industry has become accustomed to performing routine maintenance during every scheduled shutdown occurring 12 months to 18 months between cycles. These maintenance cycles are influenced by service factor, loading and the type design. The same problems exist in both the standard and super critical cyclones; severe deterioration of refractory and the anchoring pin studs. This paper focuses on one type of refractory failure mechanism caused by the anchoring pin studs. Most operators have found that the most effective means of applying refractory in this type situation is to “ram” the refractory in and around the anchoring pin studs thus creating a dense lining with maximum integrity. Coupled with proper application of anchoring pin studs and a special designed coating, typical volumetric expansion of the pin studs from corrosion attack and oxidation is eliminated thus extending the life of the refractory. This mechanism is discussed along with the results of the coating performance as it relates to extreme heat oxidation and thermal cycling in laboratory tests. A protective coating was developed using a nano-cored thermal spray wire technology that produces a uniform, adherent protective layer against high temperature corrosion and oxidation. The coating yields similar thermal conductivity as a bare stud thus experiencing excellent thermal cycle performance. This specially designed thermal spray coating is applied to standard 430 stainless steel pin studs thus providing the necessary barrier against aggressive high temperature environments while maintaining excellent heat conductivity. The coating has a high amount of tungsten (40+%) in a nickel matrix with greatly reduced oxides at the substrate and throughout the coating. With these attributes for the anchoring pin studs in mind, a newly designed stud was evaluated in heat oxidation tests up to 2000°F and thermal cycling test and compared to 430 stainless steel, chromized and Alloy 625. The new stud out-performed all others even in the as-welded condition. Further corrosion testing in ferric chloride (ASTM G48) showed them to be superior to Alloy 72 and Alloy 625 in the thermal spray and welded condition. Proper welding equipment and welding techniques are also discussed since weld continuity impacts overall performance of anchoring pin studs with refractory linings. A major test site will be examined in the spring of 2004 for it’s full effectiveness in service and will be documented in order that all data retrieved would be available to the entire industry.

scholarly journals Peel adhesion test for thermal spray coatings

1994 ◽  
Vol 3 (4) ◽  
pp. 404-411 ◽  
Author(s):  
M. Sexsmith ◽  
T. Troczynski
Keyword(s):  
Thermal Spray ◽  
Thermal Spray Coatings ◽  
Adhesion Test ◽  
Spray Coatings ◽  
Peel Adhesion

Warm Compacting Behaviors and Sintering Performance of 316L Stainless Steel Powder

2012 ◽  
Vol 538-541 ◽  
pp. 1088-1091
Author(s):  
Mei Yuan Ke
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Sintered Density ◽  
Steel Powder ◽  
Nitrogen Atmosphere ◽  
Green Density ◽  
Cold Compaction ◽  
Warm Compaction ◽  
Made In

Warm compacting behavior and sintering performance of 316L stainless steel powders were studied. Results showed that green density and strength of samples made in warm compaction were much higher than that in cold compaction. Under pressure of 700MPa, green density and strength in warm compaction were 7.01 g•cm-3and 30.7MPa, which were higher than cold compaction by 0.19 g•cm-3and 10.7MPa. When sintered in hydrogen-nitrogen atmosphere for 60 minutes, sintered density, tensile strength and elongation all increased with the rise of sintering temperature. At 1300°C, Sintered density, tensile strength and elongation were 7.42 g•cm-3, 545MPa, 28.0%, respectively.

In Vitro Biocompatibility of a New High Nitrogen Nickel Free Austenitic Stainless Steel

2007 ◽  
Vol 342-343 ◽  
pp. 605-608 ◽  
Author(s):  
Yi Bin Ren ◽  
Hua Juan Yang ◽  
Ke Yang ◽  
Bing Chun Zhang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Blood Compatibility ◽  
Platelet Rich Plasma ◽  
Clotting Time ◽  
Adhesion Test ◽  
High Nitrogen ◽  
In Vitro Biocompatibility ◽  
Time Test

The in vitro blood compatibility of a new nickel free high nitrogen austenitic stainless steel Fe-Cr-Mn-Mo-N (BIOSSN4) was studied by the kinetic clotting time test and the platelet rich plasma adhesion test in this paper. In comparison with 316L stainless steel, the kinetic clotting time of BIOSSN4 steel are longer, and only causes less activation of platelets in platelet adhesion test, which was indicated by their morphology and low spreading. The experimental results reveals that the BIOSSN4 stainless steel has better blood compatibility, the blood compatibility mechanism of steels was analyzed based on surface tension and interfacial tension between the steels and blood.

Observed Phenomena during the Development of an Adhesion Test for Coated Medical Devices

2015 ◽  
Vol 812 ◽  
pp. 381-386
Author(s):  
Torda László Sélley ◽  
Anna Kertész ◽  
Eszter Bognár
Keyword(s):  
Stainless Steel ◽  
Medical Devices ◽  
Polymer Coatings ◽  
Adhesion Test ◽  
Adhesive Properties ◽  
Coating Solution ◽  
Steel Sheets ◽  
Polymer Adhesion ◽  
Important Quality

Devices used in the field of medical technology require high biocompatibility. Medical devices that are made from stainless steel have good biocompatible properties, but polymer coatings can radically improve it. One of the most important quality of the coating is adhesion, and this was our rationale for developing a polymer adhesion testing protocol. In our research, two biocompatible polymers were compared, polyurethane (PUR) and poly-(DL-lactic-co-glycolic acid) (PDLG). Surface-treated stainless steel sheets were used as carrier for polymer layers. The adhesive properties of different layers were compared. Adhesion of the coatings was characterised by concentration of coating solution and surface roughness of the carriers, and some phenomena were observed.

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