TEHNOID is a SME dedicated to transform results of applied research into technologies, services and products. In particular, the company is involved in the development of new technologies, materials and processes for surface coatings promoting new solutions and products performances. The core business of the company is devoted to thermal spray techniques and deposition of high strength coatings.
TEHNOID will effectuate activities concerning the design and experimentation of the synthesis technology of the the pawders materials. TEHNOID develop the activities concerning the new synthesis materials, will effectuate works concerning the elaboration, experimentation and finalization of the technology. The powder-metallurgy technique has been extensively studied, and some achievements have been applied in various project and to obtaining of a sufficient quantity of material which can be used for further deposition: Powders Ni-Cr-Fe, Powders EUTALLOY10670,Powders ALLIAGE SPECIAUX-1038, Powders Al2O3, Powders Cr2C3-NiCr(75-25),Powders ZrO2-CaO,Powders EUTALOY RW 12112, Powders CASTOLIN TiO2, Powders CaF2,Powders Ni-Al(90-10), Powders Cr2C3 Powders MgO, Powders nanometrica 8Y2O3-ZrO2, etc.
During the years the company attained very good expertise in the thermal spraying coating domain using different traditional, as well as self developed innovative materials. TEHNOID will be involved to perform coatings on steel based substrates for hot working applications. In particular, ceramic and metal based coating powders will be considered to obtain intermediate and top layers characterized by high adhesion, as well as corrosion and wear resistance especially at high temperatures. The availability of both the technologies, APS and HVOF, will be very convenient in order to make comparable trials, to optimize the working parameters for all the considered cases and to establish the most convenient technology to be used as a function of the coating layers composition and performances.
The plasma metallizationAPS – atmosphere plasma jet metallization, process is based on material spraying melted in plasma jet (ceramic powder, metal, etc.) on a rack to obtain coverage. The powdered material is injected into the plasma stream at very high temperature 10.000-32.000 0C, and a speed of 1000 – 1200 m/s, there is rapidly heated and accelerated to high rate. The powder reached its softening point is projected onto the substrate where it cools suddenly forming the coating. When passing through the plasma jet, powder particles are heated up to a temperature approaching the melting point, accelerated to speeds of 300-450 m/s and in the plasma jet they are deposited on the surface in the state of the support arts. Accumulating layer is obtained from one or more successive passages according to its desired thickness. The layers obtained from metallization, must meet certain characteristics, such as: adherence to substrate, hardness layer, layer compactness, etc.
The process of plasma spray jets give the advantage of producing composite materials, based on potential thermal deposition processes to produce coatings with a large surface area, porosity interconnected, thus making possible the realization of composite materials with two or more phases.
HVOF – (High Velocity Oxygen Fuel) functioning on the principle of uni-axial injection of the metallic powder in an oxygen jet – fuel (propane, LPG, propylene) of high velocity (HV). The jet is reaching a temperature of 2750oC and 2600 m/s, plasticity of the metallic powder and the particles being accelerated till 800m/s. With this velocity the powder is projected on the metal part, result a dense layer (with porosity less than 1%) with a very good adherence and no internal tensions.
HVOF is a spraying method for the ceramic coatings with good mechanical properties and thermal protection capability. In the thermal spray process the coating is built up from lamellas formed by rapid solidification of the melted or semi-melted droplets attached to the substrate. A typical coating structure is a pancake-like lamellar structure, where the flattening rate and adhesion between the lamellas, together with the coating material itself, define the main properties of the coating. Thermal spray coatings are often applied to improve the corrosion and wear resistance of the component. Therefore, low porosity and good adhesion are desired properties for the coating. HVOF (High velocity oxy-fuel) process is one the most potential methods for producing a good adherent coating with low porosity. Due to the less porous structure of the HVOF sprayed coating as compared to the plasma sprayed one, the protection capability of the coating is increased. However, because of the relatively low temperature of the HVOF flame, the spray process must be carefully optimized in order to produce coating with a sufficient melting state and good lamella adhesion.
AFE- Atomization Flow Electron. The principle of this metallization consists of depositing a thin layer (0.05-0.1 mm) carbide (tungsten carbide, titanium carbide, etc..) on the metal parts that need protection from wear surfaces, which are applied in extreme conditions. Hardness as deposited layer can exceed 2600 HV. At the same time the piece is soaked up to 0.03 mm carbide deposited adhesion layer being equal to an interatomic connection such as metal. The deposited layer thickness can be precisely controlled, allowing the application of this procedure in cases where higher demands are imposed. This flexibility in terms of the environment in which the deposit can be achieved is one of the biggest advantages of this method over other methods of submission and the reason for comparable plasma deposition technology evolved from a coverage materials processing. The research carried out on the environment in which the thermal deposition (plasma deposition in vacuum or air environment with low pressure inert gas environment for the wire arc metalizing, and inert gas layers around any thermal deposition process) were demonstrated that the newly formed layer of filler material has a density of over 98% of the theoretical and the oxygen content is below 400 ppm.
The institution TEHNOID has the necessary logistic to assure a management of quality, which allow an efficient management of the allocated resources (human, technical and financial).
STRUCTURE OF ORGANIZATION
Personnel structure is formed so as to ensure smooth running of the activities of the enterprise.
- Three Senior Researchers in different specialization areas covering several research directions
- An economist, graduate master in project management, which can effectuate analysis concerning the identification of the risk connected with project specific, qualitative analysis of the priorities in risk management.
- A young energetician engineer, graduate of the Bologna two-cycle higher education.
– Two technical operators, qualified for metal heat installations and conduct technical processes implied.
The manager of TEHNOID is a senior scientific researcher, PhD Eng. Petra MOTOIUwith a wide experience of 24 years in the Materials and Engineering field, in the field of metallic powders obtaining and complex system powders in metals recovery and also the organic substances from residual waters. All the research directions of the project manager are related to realize surfaces with controlled properties and thermal metallization, metallic alloys and different surfaces on the metallic powders field and thermal metallization, metallic alloys and composite.
PhD Eng. Petra MOTOIU, has more than 15 research projects, principal investigator in two international projects EU and researcher in many national projects.
In the last years she collaborate with Polytechnic of Torino in a bilateral project “Realizing new coatings structures on the titan base alloys obtained by the plasma coating for new and advanced application” ITALY – ROMANIA. She is author and co-author at more than 50 papers, published in the national and international reviews and has 3 patents.
– Project MANUNET, the European project ERA-NET “in part to Improve Operating Capabilities Processed alloys in automotive and aerospace applications” Acronym: TiAlManu, 2009-2011.
– Member of the Commission to grant the Postgraduate Scholarship “Theodor Aman” scholarship(2010).
– Expert at coordinating and monitoring activities at 9 Romanian Universities in the frame of POSDRU/56/1.2/S/32768 project (2009 -2012).