Milling of Carbide-Steel Powder Components and Their Mixtures in an Attrition Mill

Pavlygo, T. M.; Plomod'yalo, Leonid G.; Plomodyalo, Roman; Svistun, L. I.

doi:10.1023/b:pmmc.0000042454.39244.8e

Cited by 3 publications

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“…Table 1 gives the characteristics of the initial powders as well as metal and TiC powders milled under optimum conditions. The optimum milling time in the attritor is under 2 h, which means that the preparation of powders for processing is done in about 1/50th of the time taken with drum mills [9]. The milled powders have ahigher oxygen content than do the initial powders.…”

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confidence: 99%

Hot Pressing Technology to Produce Wear-Resistant P/M Structural Materials with Dispersed Solid Inclusions

Pavlygo

Serdyuk

Svistun

et al. 2005

Powder Metall Met Ceram

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We have examined the possibility of milling iron, nickel, chromium, high-speed steel, and titanium carbide powders in an attritor (attrition mill) for use in producing carbide steel. The powders were milled to a particle size of 1-3 μm for TiC and 10 μm for metal components. As a rule, such powders and mixture of powders do not flow or form, which makes it impossible to produce blanks for hot pressing by the traditional die pressing method. Shells pressed from iron powders are proposed for forming a blank. We tested techniques for hot pressing dispersed powders into such envelopes.The principal conditions for materials to have superior wear resistance is that they be given a heterogeneous structure, which should consist of hard grains uniformly distributed in an elastoplastic metal matrix. When such material is in use the loads acting on it are enclosed in hard inclusions and the metal matrix acts as a stress reliever. Three kinds of contact are possible during friction of materials with a heterogeneous structure (Fig. 1). Contacts between the matrix and a hard inclusion and between two hard inclusions protect the materials from gripping. Other, equally important requirements for wear-resistant materials are that the microhardness of the inclusions be higher (no less than 3-5 GPa) than that of the matrix, that the strength at the boundaries of the components be sufficient, and that there be no porosity; the latter is the condition for the matrix to have superior mechanical properties.Powder metallurgy (P/M) methods can produce a heterogeneous structure by introducing hard particles into the material during the mixture preparation. Hot working of powder materials, in particular hot pressing, makes it possible to meet the other requirements.Iron − glass composite is an example of hot-pressed wear-resistant material. A technology for fabricating parts from that composite (sealing rings of the drive system of track-type tractors ) was developed at the IPMS NAN Ukraine (Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev), the Volgograd NII Tekhnologii Mashinostroeniya (the Institute of Machine-Building Technology), and the Volgograd Tractor Works [1,2]. The mixture prepared from PZh4M2 iron powder (GOST 9489-74, base), GK-1 graphite (GOST 4404-78, 1.1-1.3 mass%), VVS glass (5 mass%). Glass cullet was milled to a particle size of 1-10 μm. The components were mixed and pressed into a compact with a density of 5.5-5.7 g/cm 3 , which was then heated to 1423 K for 10-15 min, and pressed to a density of no less than 6.95 g/cm 3 . The microstructure of the hot-pressed iron-glass material is shown in Fig. 2.

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confidence: 99%

Hot Pressing Technology to Produce Wear-Resistant P/M Structural Materials with Dispersed Solid Inclusions

Pavlygo

Serdyuk

Svistun

et al. 2005

Powder Metall Met Ceram

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Features of cavitation destruction of multilayered composite coatings based on TiNi with a wear-resistant cBN-Co layer

Blednova¹,

Dmitrenko²,

Balaev³

2017

AIP Conference Proceedings

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Effect of Molybdenum on the Microstructure and Mechanical Properties of TiC-Fe Cermets

Dai

Zhai

et al. 2012

AMR

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The influence of Mo addition on the microstructure and mechanical properties of the TiC-Fe cermets has been studied. The specimens with different contents of Mo (4-8 wt.%) added into the TiC-Fe cermets were fabricated by conventional powder metallurgy and vacuum sintered at temperatures of 1440 °C. The microstructure and mechanical properties such as bending strength, impact toughness, hardness, wear resistance were investigated. The micrographs with different Mo content show that the final grain size of carbide phase became smaller and the specimens became more homogeneous and compact with increasing Mo content from 4 wt.% to 8 wt.% in raw powders. The mechanical properties measured show that the bending strength, impact toughness and wear resistance are the best when the Mo content is 6 wt.%.

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Milling of Carbide-Steel Powder Components and Their Mixtures in an Attrition Mill

Cited by 3 publications

References 1 publication

Hot Pressing Technology to Produce Wear-Resistant P/M Structural Materials with Dispersed Solid Inclusions

Hot Pressing Technology to Produce Wear-Resistant P/M Structural Materials with Dispersed Solid Inclusions

Features of cavitation destruction of multilayered composite coatings based on TiNi with a wear-resistant cBN-Co layer

Effect of Molybdenum on the Microstructure and Mechanical Properties of TiC-Fe Cermets

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