JPS5815074A - Ceramic spike - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The invention of B relates to ceramic spikes that are embedded in snow tires, shoes, etc. to prevent slipping, and in detail, (a) magnesium, nickel, and yttrium.

0.06 to LO weight% of 1m or more of oxides such as chromium.

(B) A ceramic sintered body consisting of 15 to 1% by weight of zirconium and/or hafnium oxide and (C) the balance alumina, wherein the average particle size of the material is 8- or less, and the sintered relative density is 98%. Sera [
It's a Tsukuspike.

The explanation will be given below using a tire cera main spike as an example.

BACKGROUND ART Conventionally, spike tires, in which hard metal, particularly cemented carbide studs, are embedded in the tire tread have been used as tires for vehicles that drive on snowy or frozen roads.

However, such spiked tires (1) generate intense noise while driving; (The damage to the phantom road surface is significant. (3) There is scattering of metal powder. (4) It is disadvantageous from an economic standpoint.

Many shortcomings have been pointed out.

The present inventors have arrived at this invention as a result of studies to eliminate the above-mentioned drawbacks of spikes.
*It is characterized by the use of a ceramic material made by adding a small amount of metal oxide to Os as a grain growth inhibitor, and further adding zirconium oxide (ZrO, ) and/or hafnium oxide, as a spike. be.

Ceramic ice spikes have been proposed in the past. (Jitko No. 46-80645, Jitsuma l849-5
1! ? (No. 49) However, the material is alkaline porcelain with a purity of over 90%, which falls under the category of porcelain, and its strength is low, so it has not been put to practical use.

A method has also been proposed in which the thick shaft portion of the spike is coated with resin to strengthen the spike itself and to make it easier to manufacture (Patent Application No. 65-454! III).
. However, this method also has fewer advantages than conventional products from the standpoint of coating cost.

This invention also solves the drawbacks of the above-mentioned ceramic spikes.
131 or more of the oxidation compound isolated from Aj, 0.0S to ID weight% as a grain growth inhibitor, and further added ZrO* and/or Hf0I 13 to 50% by weight, the balance Aj, 0.0S~ID weight%. They discovered that a ceramic material consisting of the following is most suitable as a material for spikes, and that it overcomes the above-mentioned drawbacks.

The grain growth inhibitors used in this invention, such as MrO and NiO, are ineffective if the amount is less than 0.05% by weight;
If more than 0.05% by weight is used, it will segregate into particles and reduce the strength, so the amount used should be 0.05 to 1.0% by weight.
0% by weight is suitable.

Furthermore, it is known that ZrOm and/or HfO are dispersed in a ceramic sintered body and significantly increase the strength (Japanese Patent Application No. 1982→0982), but the purpose of addition in this invention is not to increase the strength. , to reduce wear resistance.

That is, high purity Aj10. Although the sintered body has sufficient strength, its wear resistance is too high, so it has the disadvantage of causing damage to luxury roads.

This invention does not reduce the strength and sinterability (
1.5-50% by weight of ZrO and/or HfQ in the material of the ceramic spike to reduce the wear resistance to a level that does not cause damage to the road.

This was made possible by adding .

From the viewpoint of strength, the average grain size of the sintered body is 8p or less.
A relative density of 98% or more is preferred.

Furthermore, with the material composition of the present invention, sufficient strength can be ensured in the obtained ceramic spike, so it is not necessarily necessary to further strengthen the flange portion by coating with resin or the like.

Although the present invention has been described above with respect to ceramic spikes for tires, the ceramic spikes of this invention are not limited to use in tires, and can be embedded in the soles of high heels, athletic shoes, and other shoes without causing slippage. Since it has the same effect as a stopper, it can be said to be very practical, and it goes without saying that both are included in the present invention.

As for the shape of the spike, it is most preferable to have a flange portion l to prevent the tire from falling off the tire and a straight portion 2 that contacts the road, as shown in Figure 1, with a tapered surface or arc 8 connecting the two. , even if the straight portion 2 and the flange portion l are continuous in a shape close to a right angle as shown in FIG. 2, there is no problem in terms of strength.

The present invention will be explained below with reference to Examples.

Example 1 Purity 99.0%, average particle size O, ZrO dew flour rice powder 16% by weight Junmi [OBμ MrO0 3% by weight, purity 99
9%.

High-purity As@Os powder 88 powder with an average particle size of 05p and 7 powders were embossed into the shape shown in the figure and heated at 1500°C in vacuum.
By sintering, ceramic-based spikes with a sintered body having an average grain size of 2 μm and a relative density of 98% were obtained.

Mata MfO 0.8% by weight, balance 99.9% purity
0) An7oI material was also sintered in the same process to obtain high purity alumina spikes.

When both of these spikes were embedded in a tire at the same time and tested on an actual vehicle, no breakage was observed in either spike, and there was no significant difference in slip resistance. The spikes showed good results, with a large amount of wear and little damage to the road.

Example 2 ZrO snow powder rice powder 1 with a purity of 99.5% and an average particle size of 06μ
4% by weight (HfO, 2% by weight powder, 0.1% by weight MfO, 1% by weight NiOO, 05% by weight Y, O, 05% by weight, 0.05% by weight CBO, the remainder is 99.6% pure,
A ceramic spike was obtained by processing a material consisting of AjmOI powder with an average particle size of 0.5 tones in the same process as in Example 1, and its performance was examined, and the same good results as in Example 1 were obtained.

[Brief explanation of drawings]

FIG. 11 is a longitudinal sectional view showing one embodiment of the ceramic spike obtained by the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment. l - flange part, 2 - spike part. Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Patent attorney Kazu1) Reference: Figure 1, Figure 2, 389

Claims (1)

[Claims] (a) Magnesium, nickel, yttrium. 1m or more of oxides such as chromium, 5~LOX amount%. (b) A ceramic sintered body consisting of 13 to 50% by weight of zirconium and/or hafnium oxide and (C) the balance alumina, the average particle size of which is 81% by weight.
1 or less, and a sintered relative density of 985% or more.