Sandvik Ab

Sandvik Intellectual Property Ab

Sandvik Intellectual Property Aktiebolag

Ulf Rolander

Gerold Weinl

Marco Zwinkels

Per Lindahl

Anders Piirhonen

Hans-Olof Andren

Jeanette Persson

Leif Dahl

Hans Johansson

Camilla Oden

Bjorn Lundberg

Gedold Weinl

Method of producing a sintered body comprising the steps of mixing one or more powders forming hard constituents with powders forming a binder phase comprising cobalt powder where the cobalt powder comprises cobalt having mainly a fcc-structure defined as the peak height ratio between the Co-fcc(200)/Co-hcp(101) being greater than or equal to about 3/2, as measured between the baseline and maximum peak height, measured by XRD with a 2&#x3b8;/&#x3b8; focusing geometry and Cu-K&#x3b1; radiation. The present invention also relates to a ready-to-press powder comprising cobalt having mainly a fcc-structure and where the cobalt powder has a grain size (FSSS) of from about 0.2 to about 2.9 &#x3bc;m. The present invention also relates to sintered bodies made according to the method. The sintered bodied according to the present invention have reduced porosity and less crack formation.

Method of making a sintered body, a powder mixture and a sintered body

A titanium based carbonitride alloy contains Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, Co with only impurity levels of Ni and Fe, 4-7 at % Nb, 3-8 at % W and has a C/(C+N) ratio of 0.50-0.75. The Co content is 9-&#x3c;12 at % for general finishing applications and 12-16% for semifinishing applications. The amount of undissolved Ti(C,N) cores must be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The invented alloy is particularly useful for semifinishing of steel and cast iron.

Ti(C,N)-(Ti,Nb,W)(C,N)-Co alloy for finishing and semifinishing turning cutting tool applications

A titanium based carbonitride alloy containing Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, 9-14 at % Co with only impurity levels of Ni and Fe, 1-&#x3c;3 at % Nb, 3-8 at % W and has a C/(C+N) ratio of 0.50-0.75. The amount of undissolved Ti(C,N) cores should be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The alloy is particularly useful for milling of steel.

Ti(C,N)-(Ti,Nb,W)(C,N)-co alloy for milling cutting tool applications

Ti(C,N)-(Ti,Nb,W)(C,N)-Co alloy for milling cutting tool applications

A titanium based carbonitride alloy contains Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, Co with only impurity levels of Ni and Fe, 4&#x2013;7 at % Nb, 3&#x2013;8 at % W and has a C/(C+N) ratio of 0.50&#x2013;0.75. The Co content is 9&#x2013;&#x3c;12 at % for general finishing applications and 12&#x2013;16% for semifinishing applications. The amount of undissolved Ti(C,N) cores must be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The invented alloy is particularly useful for semifinishing of steel and cast iron.

Porous cubic boron nitride based material suitable for subsequent production of cutting tools and method for its production

The present invention relates to a sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in general finishing cutting operations requiring high deformation resistance in combination with relatively high toughness. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Ti(C,N)-(Ti,Ta,W)(C,N)-Co alloy for general finishing cutting tool applications

A sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in light finishing cutting operations at high cutting speed. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Ti(C,N)-(Ti,Ta,W)(C,N)-Co alloy for superfinishing cutting tool applications

The present invention relates to a sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in cutting operations requiring high toughness. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

TI(C, N)&mdash;(TI, TA, W) (C, N)&mdash;CO alloy for toughness demanding cutting tool applications

The present invention relates to a method for manufacturing a sintered body of carbonitride alloy with titanium as the main component and cobalt as the binder phase and which does not have any compositional gradients or center porosity concentration after sintering. This is achieved by processing the material in a specific manner to obtain a lower melting point of the liquid phase in the interior of the body than in the surface while balancing the gas atmosphere outside the body with the alloy composition during all stages of the liquid phase sintering.

Method for producing Ti (C,N)&mdash;(Ti,Ta,W) (C,N)&mdash;Co alloys for cutting tool applications

A method of making a PcBN cutting tool insert is provided. The composite body may be a PcBN cutting tool insert. The method includes mixing raw material powders consisting of cBN and one or more of hBN, TiC, TiN, Ti(C,N), WC, W, C, Co, Co,Al,, Al AlN, Al,O,with a liquid (e.g., ethanol) and an agent (e.g., polyethylene glycol, PEG) to form a homogeneous slurry with the desired composition; forming spherical powder agglomerates, typically 100 &mgr;m in diameter, preferably by spray drying; filling the PcBN powder into recesses, pockets, grooves, etc., of a cemented carbide or cermet substrate; presintering the compacted body to remove the agent; and causing the PcBN powder to be sintered together and simultaneously bonded to the substrate inside a container under HP/HT-conditions to form a composite body.

Method for making a sintered composite body

The present invention relates to a method for obtaining a sintered body of carbonitride alloy with titanium as main component which does not have a binder phase layer on the surface after sintering. This is obtained by performing the liquid phase sintering step of the process at 1-80 mbar of CO gas in the sintering atmosphere.

Method for producing titanium-based carbonitride alloys free from binder phase surface layer

An uncoated titanium-based carbonitride cutting tool insert with superior plastic deformation resistance and wear resistance is provided. This is accomplished by heat treating the material in nitrogen atmosphere under conditions to obtain a nitrogen rich surface zone, also containing substantial amounts of binder phase.

Titanium-based carbonitride alloy with nitrided surface zone

The present invention relates to a sintered body of titanium-based carbonitride alloy comprising hard constituents containing at least tungsten in addition to titanium in a binder phase based on cobalt. There are four distinctly different microstructural components, namely: A) cores which are remnants of and have a metal composition determined by the raw material powder; B) tungsten-rich cores formed during the sintering; C) outer rims with intermediate tungsten content formed during the sintering; and D) a binder phase of a solid solution of at least titanium and tungsten in cobalt. Toughness and wear resistance are varied by adding WC, (Ti,W)C, and/or (Ti,W)(C,N) in varying amounts as raw materials.

Growing community of inventors

Stockholm, Sweden

Ulf Rolander