Extrusion moulding of hard-metal powder using a novel binder system

Zhou, Jicheng; Huang, Baiyun; Wu, Enxi

doi:10.1016/s0924-0136(02)01058-0

Cited by 17 publications

(2 citation statements)

References 4 publications

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“…[18][19][20][21]. Extrusion and powder metallurgy can achieve low porosity, but these processes can only produce components with limited geometrical complexity [22][23][24][25][26][27]. In addition, these conventional processes are inefficient and costly [28].…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of WC-Co hardmetals: a review

Yang

Zhang

Wang

et al. 2020

Int J Adv Manuf Technol

112

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WC-Co hardmetals are widely used in wear-resistant parts, cutting tools, molds, and mining parts, owing to the combination of high hardness and high toughness. WC-Co hardmetal parts are usually produced by casting and powder metallurgy, which cannot manufacture parts with complex geometries and often require post-processing such as machining. Additive manufacturing (AM) technologies are able to fabricate parts with high geometric complexity and reduce post-processing. Therefore, additive manufacturing of WC-Co hardmetals has been widely studied in recent years. In this article, the current status of additive manufacturing of WC-Co hardmetals is reviewed. The advantages and disadvantages of different AM processes used for producing WC-Co parts, including selective laser melting (SLM), selective electron beam melting (SEBM), binder jet additive manufacturing (BJAM), 3D gel-printing (3DGP), and fused filament fabrication (FFF) are discussed. The studies on microstructures, defects, and mechanical properties of WC-Co parts manufactured by different AM processes are reviewed. Finally, the remaining challenges in additive manufacturing of WC-Co hardmetals are pointed out and suggestions on future research are discussed.

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Section: Introductionmentioning

confidence: 99%

Additive manufacturing of WC-Co hardmetals: a review

Yang

Zhang

Wang

et al. 2020

Int J Adv Manuf Technol

112

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“…Experimental batches of powder mixtures were also used to extrude samples of thermocouple materials of nicrosil and nisil in the form of cylindrical rods with a diameter of about 5 mm and a length of 200 mm similar to the way it was done in [9]. The powder mixture was mixed with a plasticizer based on paraffin wax with some technological additives and in heated condition extruded by a piston type machine through a hole 6 mm in diameter forming a cylindrical green compact.…”

Section: Methodsmentioning

confidence: 99%

Development of Technology of Nicrosil and Nisil Thermocouple Materials Using Extrusion of Metal Powders

Samboruk

Амосов

Kuznets

et al. 2017

KEM

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Nicrosil-nisil (NiCrSi-NiSi) thermocouples (Type N) have a high thermal EMF stability, radiation resistance, resistance to oxidation of the thermocouple wires and can be used as a universal means of measuring temperatures up to 1300 °C. However, when the traditional metallurgical method is used for the production of rod and wire materials of nicrosil and nisil from ingots of metals, it is difficult to ensure the homogeneity of the ingots and materials of the thermocouple. It is known that powder metallurgy methods can provide a greater homogeneity of the material compared to casting technology. The aim of this work was to study the possibility of using powder technology for the fabrication of rods of nicrosil and nisil thermocouple materials by extrusion and sintering of powders of source metals. Reduction in size and mixing of the raw powder components in a planetary ball mill was investigated. The regularities of pressing the prepared mixtures and microstructure of materials sintered from them were determined. Samples of nicrosil and nisil thermocouple materials in the form of cylindrical rods with a diameter of about 5 mm and a length of 200 mm with an uniform microstructure were also fabricated by extrusion of prepared mixtures followed by sintering. Experimentally determined specific differential thermal EMF of the thermocouple made from the sintered rods coincided with the theoretical value.

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