MIM Technology Research Articles

ИССЛЕДОВАНИЯ ВОЗМОЖНОСТИ ПОЛУЧЕНИЯ ПРИ ПОМОЩИ MIM ТЕХНОЛОГИИ ВОДОРОД-АККУМУЛИРУЮЩИХ МАТЕРИАЛОВ СИСТЕМЫ TI-FE

The study experimentally proved the possibility of obtaining intermetallic materials of the Ti-Fe system from mixtures of titanium and iron powders using MIM technology and subsequent reaction sintering. It has been established that the structure of such materials is close to stable equilibrium and contains TiFe as the main intermetallic phase.

Fabrication of TiAl alloys turbocharger turbine wheel for engines by metal injection molding

The TiAl turbine wheels possess high acceleration responsiveness and low energy consumption due to its low density, high specific strength and excellent oxidation resistance. However, the mechanical properties of the turbine wheels fabricated by conventional casting can't be fully utilized resulted from inherent defects and compositional segregation. Herein, we used a near-net shaping MIM technology to fabricate this alloy and firstly produced a TiAl alloy turbocharger turbine. The rheological properties of feedstocks, microstructure and mechanical properties were systematically studied. Results indicate that the Feedstock F3 has better rheological properties and no powder-binder separation during injecting using numerical simulation. The microstructure is homogenous and fine-grained fully α2/γ lamellar structure with average size of 111.7 μm. The HIPed TiAl alloy displays excellent mechanical properties which are higher than that of the equivalent casting TiAl alloys. This work presents a valuable method for fabricating complex-shaped TiAl alloy turbine wheels.

MIM-ТЕХНОЛОГИЯ КАК СПОСОБ ИЗГОТОВЛЕНИЯ ТОЧНЫХ ДЕТАЛЕЙ ИЗ МЕТАЛЛОПОРОШКОВЫХ КОМПОЗИЦИЙ, В ТОМ ЧИСЛЕ ТИТАНОВЫХ СПЛАВОВ (обзор)

The overview of MIM technology application (injection molding technologies for parts based on metal-powder compositions) as a method of manufacturing precision parts from metal-powder compositions is represented in this article. The features of the manufacturing of parts by additive technologies are also considered. The main stages of the technological process are given. Applied industries and using material statistic data are reflected. The focus was made on analyze of opportunity of application MIM technology in the manufacturing parts from titanium alloys.

Research of 3D Printing Modes of Feedstock for Metal Injection Molding

In this work, to reduce the cost of production of parts using injection molding metal technology (MIM technology), it is proposed to use additive technologies (AT) for the manufacture of green parts. The use of AT allows us to abandon expensive molds and expand the field of use of the MIM of technology in single and small-scale production. For manufacture of green parts, the technology of manufacturing fused filament (Fused Filament Fabrication – FFF) is offered. The original composition of the metal powder mix (feedstock) and the filament manufacturing modes for 3D printing have been developed for the FFF technology. The cost of filament is much lower than its analogs. The factors affecting the print quality of green part are considered. All factors are divided into two groups depending on the possibility of their change during printing. The research of the influence of the coefficient filament supply on the geometry of green parts during 3D printing is presented.

Development of Ultra-Fluid Compositions of Feedstock for Metal Injection Molding

In this paper, to reduce the cost of production of parts by injection molding technology of metal powder mixtures (MIM technology), it is proposed to use metal powder mixtures (feedstock) with high fluidity for the manufacture of green parts. High fluidity is achieved by increasing the proportion of paraffin wax in the binder. This can significantly reduce the pressing pressure when pressing the feedstock into the mold cavity to values less than 1 bar, and eliminate the use of expensive injection molding machines with high compression pressure. High fluidity also allows the use of powders with large particle sizes, which significantly reduces the cost of feedstock. The absence of high pressure on the mold walls during the pressing of the feedstock allows the use of molds made of cheaper materials such as silicone, plastic, gypsum and others.

A Study of the Microstructure and Magnetic Properties of Fe – Cr – Co Alloys with Reduced Content of Coobtained by the Mim Technology

The possibility of fabrication of permanent magnets based on a Fe – Cr – Co alloy with reduced cobalt content by the MIM technology is considered. The method is used to obtain permanent magnets 3 × 2 × 6 mm in size with magnetic properties close to those of standard 25Kh15KA magnets produced by investment casting. The microstructure and the magnetic properties of the alloys are studied.

Effect of the Fraction of Steel 4605 Powder in the Load in Injection Molding with the Use of a Polymer-Based Binder

The effect of the relative fraction of powder of steel 4605 (0.42% C, 2.15% Ni, 0.49% Mo, 0.1% Si) mixed with a polymer binder in injection molding of billets (the MIM technology) on their tensile mechanical properties, hardness, density and toughness is studied. The polymer binder is based on high-pressure polyethylene (HDPE), paraffin wax (PW) and stearic acid (SA). It is shown that the mechanical properties, the density and the toughness increase with the proportion of the powder in the working mixture (feedstock), and the combination of the strength and formability is the best at 62 vol.% powder in the feedstock.

Problems of Development of Mim Technology in Russia as Applied to Production of Permanent Magnets

Main problems arising in installation of novel processes of production of permanent magnets based on the Fe – Cr – Co and Sm – Co systems are presented. The technological possibilities of production of permanent magnets from an alloy of the Fe – Cr – Co system by methods of MIM technology and powder metallurgy are described. Methods of MIM-technology with the use of domestic granulate are used to fabricate permanent magnets based on alloy 25Kh15KA (Fe – Co – Cr system) with residual induction Br = 1.12 T, maximum energy product (BH)max = 23.0 kJ/m3 and coercivity HcB = 39.7 kA/m.

Powder Metallurgy in Belarus and Global Developmental Trends

Trends and prospects for the development of industry according to materials of European and world congresses on powder metallurgy and publications in leading specialized foreign editions are analyzed. Trends of the stable development of the production of powder structural parts for the automotive industry in developed countries, including using assembly technology during joint sintering, are noted. The production of articles using MIM methods is constantly growing, and micro MIM technology has become a separate subindustry, making it possible to manufacture products 0.1 g and less in weight. HIP methods have found a second use; it becomes possible to fabricate large-scale billets from corrosion-resistant steels up to 1000 kg in weight, and post-HIPing technology is used increasingly to improve the quality of products fabricated by additive technologies and important castings. Products up to 100 kg in weight are already being fabricated using additive technologies. The author’s opinion on the developmental prospects of powder metallurgy in Europe and around the world is also formulated, and the developmental directions of industry in Belarus and its influence on the development of global powder metallurgy are determined. In particular, new brands of economically alloyed powder steels are being developed. They make it possible to decrease the prime cost of mass structural parts without worsening their technical characteristics. For the same purpose, the processes of sintering combined with quenching are improved and endogas is used for cooling instead of nitrogen, unlike foreign analogs.

Powder metallurgy in Belarus and global development trends

The analysis of trends and prospects for the development of the industry on the materials of European and world congresses of powder metallurgy, publications in leading specialized foreign publications was carried out. The steady growth of the production of powder construction parts for the automotive industry, including using assembly technology during joint sintering, are noted in the developed countries. The production using MIM methods is constantly growing; micro MIM technology has emerged as a separate sub-industry, which allows manufacturing products with a mass of 0,1 g or less. HIP methods found its second wind: with them it became possible to obtain large-sized blanks from corrosion-resistant steels weighing up to 1000 kg, titanium and high-temperature alloys; the post HIPing technology is widely used to improve the quality of products obtained by additive technologies and important castings. With additive technologies, products weighing up to 100 kg are already being manufactured. The authors also formulated their own opinion about the prospects for the development of powder metallurgy in Europe and in the world, determined the development directions of the industry in Belarus and its influence on the development of world powder metallurgy. In particular, new grades of economically alloyed powder steels are developed. They make it possible to reduce the cost of mass structural parts without prejudice to their technical characteristics. For the same purpose, processes combined with hardening of sintering are optimized, and, in contrast to foreign analogues, endogas is used for cooling instead of nitrogen.

The Development of New Materials and Modes of Casting Metal Powder Mixtures (MIM Technology)

In the present work, to reduce the cost of production of the parts with MIM technology, proposed to use a new metal powder mixture (feedstock are presented) with the increased size of the powder to 50 microns. New feedstock are presented recommended for use in the manufacture of parts with a wall thickness of 5 mm. Shows the main physical and technological properties of new metal powder mix (feedstock) 40ХМА of steel intended for the manufacture of parts via MIM technology. Given the results of determination of granulometric composition and particle shape. The obtained values of tensile strength, hardness and roughness. The results of determining the dependence of viscosity on shear rate. For simulation of rheological properties of selected elastic-visco-plastic model of Bingham type with nonlinear dependence of viscosity on shear rate and temperature. The example of the calculation of feedstock fill the cavity of the mold. The analysis of defects in green part, associated with an irregular velocity field in the flow channels feedstock form.

Studies on the Carburizing Process of AISI 8620 Steel Obtained by MIM Technology

Studies on the Carburizing Process of AISI 8620 Steel Obtained by MIM Technology

Development of feedstock of tungsten-nickel-iron- polyformaldehyde for MIM technology

The article presents the results of the research and development of technology and formulation of the feedstock from domestic metal powders and polymers to fabricate complexshaped components from heavy alloy of VNZh 7-3 brand (90 wt. % tungsten - 7% nickel - 3% iron) by Metal Injection Molding (MIM technology). The metal part of the feedstock is composed of powders of tungsten, nickel and iron, and the polymer part is composed of polyformaldehyde with the addition of low-density polyethylene and beeswax. The modes of mixing the components and the influence of the composition of the feedstock on the melt flow rate and the homogeneity of the feedstock were investigated. The optimal formulation of the feedstock was determined. Microstructure, density and hardness of control samples fabricated by MIM technology from the developed feedstock, correspond to, and in some respects are superior to the samples of VNZh 7-3 alloy fabricated by technology of traditional powder metallurgy.

Development and Qualification of Tungsten and Tungsten Alloys for Fusion

The material requirements for structural and armor applications in the future nuclear fusion reactors impose a very high barrier to be surmounted in order to fulfill the safety requirements and reliable operation of the systems. The efforts of NRG and ECN in the developing of materials by Powder / Metal Injection Molding (PIM / MIM) are very promising and show a big potential of this technique as a prospective net shape parts manufacturing method, easily scalable to industrial level. Several MIM materials were developed by the ECN and characterized at NRG within European Fusion Development Agreement (EFDA) Work Programme. Of them, two materials - pure tungsten (W) and tungsten doped with 1vol% Y2O3 are demonstrating good potential for likely future use. Therefore, further characterization efforts are needed. The MIM W-1%Y2O3 material seems to be very promising material for armor applications. Extensive thermal shock testing performed at JUDITH 1 up to 1000 cycles and up to 1273 K did not cause crack formation.Additionally, two-component mock-ups were produced using MIM technology. From the very first microstructural investigation of the join area appears that MIM technology can be used as a reliable component joining method.

The Study and Application of Metal Injection Molding of Fe-Ni-Co Alloy

Packaging material of electronic goods requires higher strength, higher reliability, and lower expansion coefficient .What’s more, forming process is important. The Fe-Ni-Co alloy has a low expansion coefficient and good structure stability, so it is often used for packaging materials for the semiconductor industry. The shape of electronic packaging parts is so complex that the traditional manufacturing processes are difficult to form and it costs more, which greatly limits the application of Fe-Ni-Co alloy in complex electronic packaging parts. Metal (ceramic) powder injection molding (MIM / CIM) is a new near net shape technology. In this paper, we analyze the structures and characteristics of Gehause which is an electronic packaging box that has been successfully used in the MIM process to produce it. In this process, we adopted a new material of Fe-Ni-Co alloy, a specia binder and SPC (Statistical Process Control) technology which control parameters of injection molding and weight of parts. After sintering, the mechanical properties and precision of finished products meet all demands. Therefore, MIM technology can greatly improve the production efficiency, save materials and reduce production costs in producing Gehause.

Dual‐band CRLH branch‐line coupler in MIM technology

AbstractA dual‐band (DB) composite right/left‐handed (CRLH) branch‐line coupler implemented in metal–insulator–metal technology is presented. A simple and accurate circuit‐model design procedure for DB CRLH transmission lines is described and applied to the coupler. A prototype operating at 4.2 and 5.2 GHz is demonstrated in excellent agreement with both circuit and full‐wave simulations. © 2006 Wiley Periodicals,Inc. Microwave Opt Technol Lett 48:2331–2333, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21948

Correction to "Investigation of core loss in PM micro-motor made using MIM technology"

Correction to "Investigation of core loss in PM micro-motor made using MIM technology"

Hawk corp moves into MIM technology

Hawk corp moves into MIM technology

Performance of carbonyl iron powder with a new injection moulding binder: P.H.Booker et al. (Thermal Technology, Inc, USA.)

Metal injection moulding is an attractive and expanding manufacturing technology. Recently, technical hurdles which have been inhibiting the expected growth for years, have been overcome to a significant extent. BASF got involved in MIM at a very early stage, successfully developing several carbonyl iron powder grades, geared to the needs of the MIM industry. Recently the firm's involvement in MIM resulted in the development of an innovative system. It is based on polyacetal type binders, and acid catalyzed depolymerization during the debinding step. The Metamold technology package includes supply of commercial quantities of new MIM feedstock as well as a comprehensive technical service. Martin Bloemacher and Dieter Weinand present the system from a technical and a commercial point of view. Advantages over conventional MIM technology are highlighted.

EPMA Activities Highlight Potential of MIM Technology

EPMA Activities Highlight Potential of MIM Technology