Preparing nano structural WC-Co powders by utilizing soluble raw materials by spray drying and synthesis method

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Thermal sprayed carbide such as WC-Co(Cr) and Cr3C2-NiCr coatings are well known and widely used for wear protection purposes. Submicron, nano-sized and multimodal carbides in cermets have shown promising results in gaining hardness and wear performance. Presented study is a part of the research aiming to create a novel powder manufacturing route for homogenous nano structural WC-Co(Cr) powder for thermal spraying by utilizing water soluble raw materials. One major challenge for this manufacturing route is to produce dense and spherical powder structure by spray drying method which during synthesis stage will conserve shape even if desired phase structure will form. In this study powders were manufactured via spray drying method from water based solution with raw materials ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobalt source. Before the spray drying stage additives were added to experimental solutions to modify solution properties. Solutions were characterised by rheometer and in addition pH-value was measured. Also the effects of spray drying parameters to powder form and particle size was analysed. After spray drying powders were heat treated in Ar atmosphere. The morphology and internal structure of powder particle size was analysed with scanning electron microscopy (SEM) both after spray drying and heat treatment stage and an X-ray diffractometer (XRD) was used for phase structure analysis. With modifications on solution by additives and on spray drying parameters powder particle size, shape and density could be improved but still particle shape was not conserved during the heat treatment stage.
Original languageEnglish
Title of host publicationPARTEC 2016
Subtitle of host publicationBook of Abstracts
Publication statusPublished - 2016
EventInternational Congress for Particle Technology, PARTEC 2016 - Nürnberg, Germany
Duration: 19 Apr 201621 Apr 2016

Conference

ConferenceInternational Congress for Particle Technology, PARTEC 2016
Abbreviated titlePARTEC 2016
CountryGermany
CityNürnberg
Period19/04/1621/04/16

Fingerprint

Spray drying
Raw materials
Powders
Particle size
Phase structure
Carbides
Cobalt
Heat treatment
Wear of materials
Thermal spraying
Cermets
Rheometers
Diffractometers
Tungsten
Amino acids
Water
Hardness
X rays
Coatings
Scanning electron microscopy

Keywords

  • nano-sized WC-Co
  • thermal spraying
  • spray drying

Cite this

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title = "Preparing nano structural WC-Co powders by utilizing soluble raw materials by spray drying and synthesis method",
abstract = "Thermal sprayed carbide such as WC-Co(Cr) and Cr3C2-NiCr coatings are well known and widely used for wear protection purposes. Submicron, nano-sized and multimodal carbides in cermets have shown promising results in gaining hardness and wear performance. Presented study is a part of the research aiming to create a novel powder manufacturing route for homogenous nano structural WC-Co(Cr) powder for thermal spraying by utilizing water soluble raw materials. One major challenge for this manufacturing route is to produce dense and spherical powder structure by spray drying method which during synthesis stage will conserve shape even if desired phase structure will form. In this study powders were manufactured via spray drying method from water based solution with raw materials ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobalt source. Before the spray drying stage additives were added to experimental solutions to modify solution properties. Solutions were characterised by rheometer and in addition pH-value was measured. Also the effects of spray drying parameters to powder form and particle size was analysed. After spray drying powders were heat treated in Ar atmosphere. The morphology and internal structure of powder particle size was analysed with scanning electron microscopy (SEM) both after spray drying and heat treatment stage and an X-ray diffractometer (XRD) was used for phase structure analysis. With modifications on solution by additives and on spray drying parameters powder particle size, shape and density could be improved but still particle shape was not conserved during the heat treatment stage.",
keywords = "nano-sized WC-Co, thermal spraying, spray drying",
author = "Hanna-Mari Sinilehto and Ulla Kanerva and Marjaana Karhu and Juha Lagerbom and Tommi Vuorinen and Tomi Lindroos and Erja Turunen",
note = "Project code: 100711",
year = "2016",
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}

Sinilehto, H-M, Kanerva, U, Karhu, M, Lagerbom, J, Vuorinen, T, Lindroos, T & Turunen, E 2016, Preparing nano structural WC-Co powders by utilizing soluble raw materials by spray drying and synthesis method. in PARTEC 2016 : Book of Abstracts. International Congress for Particle Technology, PARTEC 2016, Nürnberg, Germany, 19/04/16.

Preparing nano structural WC-Co powders by utilizing soluble raw materials by spray drying and synthesis method. / Sinilehto, Hanna-Mari; Kanerva, Ulla; Karhu, Marjaana; Lagerbom, Juha; Vuorinen, Tommi; Lindroos, Tomi; Turunen, Erja.

PARTEC 2016 : Book of Abstracts. 2016.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Preparing nano structural WC-Co powders by utilizing soluble raw materials by spray drying and synthesis method

AU - Sinilehto, Hanna-Mari

AU - Kanerva, Ulla

AU - Karhu, Marjaana

AU - Lagerbom, Juha

AU - Vuorinen, Tommi

AU - Lindroos, Tomi

AU - Turunen, Erja

N1 - Project code: 100711

PY - 2016

Y1 - 2016

N2 - Thermal sprayed carbide such as WC-Co(Cr) and Cr3C2-NiCr coatings are well known and widely used for wear protection purposes. Submicron, nano-sized and multimodal carbides in cermets have shown promising results in gaining hardness and wear performance. Presented study is a part of the research aiming to create a novel powder manufacturing route for homogenous nano structural WC-Co(Cr) powder for thermal spraying by utilizing water soluble raw materials. One major challenge for this manufacturing route is to produce dense and spherical powder structure by spray drying method which during synthesis stage will conserve shape even if desired phase structure will form. In this study powders were manufactured via spray drying method from water based solution with raw materials ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobalt source. Before the spray drying stage additives were added to experimental solutions to modify solution properties. Solutions were characterised by rheometer and in addition pH-value was measured. Also the effects of spray drying parameters to powder form and particle size was analysed. After spray drying powders were heat treated in Ar atmosphere. The morphology and internal structure of powder particle size was analysed with scanning electron microscopy (SEM) both after spray drying and heat treatment stage and an X-ray diffractometer (XRD) was used for phase structure analysis. With modifications on solution by additives and on spray drying parameters powder particle size, shape and density could be improved but still particle shape was not conserved during the heat treatment stage.

AB - Thermal sprayed carbide such as WC-Co(Cr) and Cr3C2-NiCr coatings are well known and widely used for wear protection purposes. Submicron, nano-sized and multimodal carbides in cermets have shown promising results in gaining hardness and wear performance. Presented study is a part of the research aiming to create a novel powder manufacturing route for homogenous nano structural WC-Co(Cr) powder for thermal spraying by utilizing water soluble raw materials. One major challenge for this manufacturing route is to produce dense and spherical powder structure by spray drying method which during synthesis stage will conserve shape even if desired phase structure will form. In this study powders were manufactured via spray drying method from water based solution with raw materials ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobalt source. Before the spray drying stage additives were added to experimental solutions to modify solution properties. Solutions were characterised by rheometer and in addition pH-value was measured. Also the effects of spray drying parameters to powder form and particle size was analysed. After spray drying powders were heat treated in Ar atmosphere. The morphology and internal structure of powder particle size was analysed with scanning electron microscopy (SEM) both after spray drying and heat treatment stage and an X-ray diffractometer (XRD) was used for phase structure analysis. With modifications on solution by additives and on spray drying parameters powder particle size, shape and density could be improved but still particle shape was not conserved during the heat treatment stage.

KW - nano-sized WC-Co

KW - thermal spraying

KW - spray drying

M3 - Conference abstract in proceedings

BT - PARTEC 2016

ER -