DD299901A7 - SLIDING ELEMENTS FOR WINTER SPORTS EQUIPMENT - Google Patents

Abstract

The invention relates to the field of materials science. The aim of the invention is to increase the performance of winter sports equipment. The object of the invention to provide a material for sliding elements, which has very good Gleitfaehigkeit and in which the dependence of the sliding behavior of the ambient and ice or snow temperature is low, which is very good polishable and verschleiszfest, so that a long service life of Surface finish is also given in ice and snow pollution, is solved with a nickel alloy, which consists of at least 40 * Ni and 5-30 * Cr, 0-25 * Co, 0.5-7 * Al, 0.2-5 * Ti , 0-18 * Mo, 0-10 * Fe, 0.02-1 * C, 0.01-0.2 * B, 0.12 * W, 0-6 * Nb, 0-10 * Ta, * Mn, 1 * Si, 2 * V, 2 * Hf, 1 * Cu and has a material composition of a cubic-area-centered matrix with 5-80 * precipitates, predominantly a g-precipitation type of the form Ni3 (Al, Ti).

Description

Field of application of the invention

The invention relates to the field of materials science. Objects that can be produced with the material according to the invention are Gleitelofnente for winter sports equipment, such as runners for bobsleds, racing sleds, ice sailors, skates, edges for skis and the like.

Characteristic of the known technical solutions

The performance of winter sports equipment depends to a large degree on the sliding ability of skids on ice or snow. It is mainly influenced by the coefficient of friction of the runner material on ice or snow and their dependence on the environmental conditions, with a high surface quality of Kufengieitfläche and a suitable geometric shape of additional importance. To achieve high sliding speeds skid materials are required, which in addition to a low and the meteorological conditions as little dependent friction coefficient, such as high polishing ability and high wear resistance, so that the optimum surface quality not by the ice or snow and in and on the ice or snow abrasive abrasive dirt and sand particles is deteriorated in the short term. Favorable sliding conditions in the range of a few degrees below the melting temperature of ice are achieved with those metallic materials which have a low thermal conductivity. This is a necessary, but not sufficient requirement. Not all materials with low thermal conductivity achieve favorable and less environmentally dependent sliding properties in ice or snow as sliding partners. Currently used for sliding elements of winter sports equipment

Metallic materials, C-bars (C15-C100) for bobsled skis, high-hardness Rustenitic steels (eg X15CrNiSi25,20) for sled runners and hardened tool and high-speed steels for fast-start completes meet the stated main requirements, low, largely environmentally independent, coefficient of friction , high polishability, high wear resistance and sufficient machinability, not yet required.

Object of the invention

The object of the invention is to increase the performance of winter sports equipment.

Explanation of the essence of the invention

The invention is the Aufgabezugrunde.einen material for sliding elements of winter sports equipment with low and little dependent on the meteorological conditions friction coefficient on ice or snow indicate that is resistant to wear and in which the achieved by polishing high surface quality during a race largely maintained. The object of the invention is achieved in that the material is a nickel alloy, consisting of at least 40 wt .-% Ni and

5-30 wt% Cr, preferably 10-22 wt% Cr

0-25 wt% Co, preferably 0-22 wt% Co

0.5-7% by weight of Al, preferably 0.5-6% by weight of Al

0.2-5% by weight of Ti, preferably 0.2-3.5% by weight of Ti r

0-18 wt% Mo, preferably 0-6 wt% Mo

0-10% by weight of Fe, preferably 0-5% by weight of Fe

0 02-1 wt.% C, preferably 0.02-0.2 wt.% C

0.01-0, iGev ..-% B preferably 0.01-0.1 wt .-% B

0-12 wt% W, preferably 0-12 wt% W

0-6 wt% Nb, preferably 0-6 wt% Nb

0-10 wt% Ta, preferably 0-10 wt% Ta

<1% by weight of Mn, preferably <1% by weight of Mn

<1% by weight of Si, preferably 1% by weight of Si

<2% by weight V preferably S 2% by weight V <. 2 wt% Hf preferably: S 2 wt% Hf 1 wt% Cu preferably s 1 wt% Cu

with the usual technical impurities and a material structure, of a face-centered cubic matrix with 5 to 80Vol .-% precipitates, mainly a γ'-type of precipitation of the form Ni ₃ (ΑΙ, Τί) having. *

It is known to the person skilled in the art that such a material structure can be produced following the production process of the semi-finished products either by slow cooling from warm deformation to room temperature or by a targeted heat treatment consisting of solution annealing and subsequent single or multi-stage precipitation treatment.

This material has opposite to the z. Z. before and adapted to the particular application materials significantly more favorable sliding properties on ice of different temperature. It is excellently polishable and the high gloss finish is maintained through improved wear and corrosion resistance throughout the race. High mechanical strength requires good track edge resistance, mechanical workability is sufficient. In various environmental and ice conditions, the reduction in travel time compared to conventional skid materials 0.2-1.2%, with the best results at ice temperatures <-4 ⁰ C are achieved. The alloy is easily adapted to the intended use by optimizing the compositions given in the limit values. The invention will be explained in more detail in the following embodiments with reference to two proven nickel alloys.

Embodiment 1

For racing sled competition equipment a runner material was used, consisting of a nickel alloy of the composition:

0.1 wt Va B, 0.1 wt .-% C, 0, CGew .-% Fe, 19Gew .-% Cr, 17Gew .-% Co, 4,5Gew .-% Mo, 3 wt .-% of Ti and 5% by weight of Al, balance nickel. Through targeted heat treatment, the alloy has a microstructure containing a proportion of about 30 vol .-% precipitates of type γ 'in addition to small percentages of carbide and other precipitates. The runners are excellent polishable, the hardness is 400-500HV, tensile strength 1000-1200MPa. In comparative runs, the skids made of the material according to the invention were clearly superior to skids of conventional materials under different environmental and ice conditions. For racing skids, this nickel alloy is still sufficiently machinable.

Embodiment 2

For the complicated shape of Bobkufen a nickel alloy was used, which has an insignificantly deteriorated property pattern, but is better machinable.

The nickel alloy consists of 20 wt% Cr, 1 wt% Co, 1.5 wt% Al, 2.5 wt% Ti, 0.1 wt% B ₁ 0.5 wt% Mn, 0.03 wt .-% C, balance nickel.

The structure of the alloy contains about 30 vol .-% excretions of type γ 'in addition to small percentages of carbide and other precipitates.

Claims (2)

<1 wt .-% Cu "is used with the usual technical impurities, the material structure of a cubic face-centered matrix with 5 to 80Vol .-% precipitates, mainly a γ'-type of precipitation of the form N13 (Al ₁ Ti) has , <1% by weight of Si <2% by weight V <2% by weight Hf <1% by weight of Mn 1. sliding elements for winter sports equipment, characterized in that a nickel alloy with at least 40 wt .-% Ni and 5-30 wt .-% of Cr 0-25 wt% Co 0.5-7 wt% Al 0.2-5 wt% Ti 0-18 wt% Mo 0-10% by weight Fe 0.02-1% by weight C 0.01-0.2% by weight B 0-12% by weight W 0-6% by weight Nb 0-10% by weight .-% Ta 2. Sliders for winter sports equipment according to item 1, characterized in that a nickel alloy is used, the at least 40 wt .-% Ni and 10-22 wt .-% Cr 0-22 wt .-% Co 0.5-6 wt. % AI 0.2-3.5 wt% Ti 0-6 wt% Mo 0-5 wt% Fe 0.02-0.2 wt% C 0.01-0.1 wt% % B <1% by weight Mn <1% by weight Si <2% by weight V <2% by weight Hf <1% by weight Cu.