JPH01280492A - Cutter - Google Patents

Abstract

PURPOSE:To uniformly apply a force to all cutting edges, to cause a cutting effect to be good, to cause the cutting edge to be hard, and to prevent the knife edge from being worn and getting rusty by executing the coating of amorphous ceramics in the thickness of 1mum or below. CONSTITUTION:The amorphous ceramics are made to coat a substrate cutting edge as thinly as possible in the thickness of 1mum or below, preferably, 0.5mum or below. For the amorphous ceramics, the substrate cutting edge is coated in preceding to the recessed part of the substrate cutting edge, and an irregularity generated at the substrate cutting edge is flattened. The ceramics mentioned here include a zirconium, a titanium oxide, a titanium carbide, a material generally used as ceramics by an evaporation, and a hydroxiapatite. Thus, the irregularity generated due to the material itself of the cutting edge is flattened by evaporated ceramics, a bonding force between a film and the cutting edge is strong, the film is hard, and thereby, the film cannot be separated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to cutlery, more specifically, cutlery coated with amorphous ceramics having a thickness of 1 μm or less, which is sharp and does not require sharpening, and furthermore, a cutter coated with amorphous hydroxyapatite to a thickness of 1 μm or less.
This relates to cutlery coated with the following thickness.

Conventional technology Cutlery has traditionally been made of carbon steel. Carbon steel has the advantage of being a rich material, cutting well, and being easy to produce, but if left unused after use, it will quickly rust, and if you cook with rusty knives, iron will be mixed in and the taste will deteriorate. Also, since the cutting edge has minute irregularities due to the material itself, it will not be sharp if used as a knife as is. Therefore, it is necessary to constantly sharpen the blade to adjust the rust and minute irregularities on the cutting edge and make it flat. However, sharpening requires experience, and constantly sharpening is complicated, and it is often the case that the sharpness of a knife that has been sharpened with the intention of improving its sharpness actually deteriorates. Because sharpening is a complicated operation and requires experience, knives made of stainless steel are used instead of steel because they last a long time without rusting even after repeated use. Stainless steel knives do not rust, but they are harder than steel, so it is difficult to sharpen the small irregularities on the edge and make it flat, making it difficult to sharpen. In this way, because of the minute irregularities on the cutting edge of the material itself, the force is not applied uniformly to the edge of the blade, resulting in a loss of sharpness. It is necessary to maintain good sharpness.Recently, corrosion prevention,
In order to further add durability, hardness, sharpness, smooth texture, etc., and as the toxicity of nickel began to become a problem, we developed blades coated with ceramics, polymers, etc., and blades made of ceramic or ceramic. Nickel-free knives are beginning to be used. The coating increases the hardness of the base material and lengthens the time between sharpening, but if used forcibly, the coating material may peel off or the ceramic may spill due to the thick coating layer. For this reason, products with multilayer coating are also used. On the other hand, these knives are difficult to sharpen because they are hard, and it is difficult to adjust the minute irregularities on the cutting edge to a flat surface.In addition, metal knives tend to lack sharpness because the edges cannot be made thinner. . As mentioned above, it is necessary to sharpen all types of cutlery in order to improve the sharpness caused by minute irregularities in the material of the edge of the cutlery, and various types of sharpeners have been devised.

Therefore, if it is possible to flatten the minute irregularities of the material of the cutting edge without sharpening it, it is expected that a knife with good sharpness that does not require a sharpener will be made possible.

Problems to be Solved by the Invention In the present invention, the cutting edge is machined to be flat and thin, so force is applied uniformly to all of the cutting edges, resulting in good sharpness.In addition, the cutting edge is hard and does not wear out and does not rust, making it sharper than conventional knives. This provides a sharp knife that does not require sharpening.

Means for Solving the Problems As mentioned above, there are cutlery in which stainless steel or steel base materials are coated with metals such as rhodium, cobalt, chromium, ceramics such as silicon carbide or zirconia, or polymers. However, there were disadvantages in terms of wear resistance, ceramics in terms of texture, and polymers in durability and sharpness, and no single material could satisfy all requirements.

Also, due to the properties of the coating material, these knives have minute irregularities on the cutting edge of the coating material itself, and if the coating material is hard, it is extremely difficult to sharpen it flat, and the sharpness is not as good as it is now. Ta. As a result of our research on blades with flat cutting edges and good sharpness, we found that by coating the base cutting edge with amorphous ceramics to a certain thickness, minute irregularities on the cutting edge can be eliminated, resulting in a flat and sharp blade. I learned that it would happen. In addition, since the coating ceramic is amorphous, it has a strong bond with the cutting edge of the base material and is hard, so it does not wear or peel off, so there is no need to sharpen it during use. That is, the amorphous ceramic is made as thin as possible (1 μm or less, preferably 0.0
．． Neat the cutting edge of the base material to a thickness of 5 μm or less. The amorphous ceramic coats the cutting edge of the base material preferentially over the concave portion of the cutting edge of the base material, thereby flattening the irregularities occurring on the cutting edge of the base material. When the coating layer of amorphous ceramics is made thicker, the coating layer of amorphous ceramics is further crystallized on the cutting edge of the base material, which has been coated from the recessed portion and is once flattened. This is undesirable because the amorphous ceramic causes minute irregularities on the cutting edge regardless of the irregularities on the base material cutting edge.

Crystallization of amorphous ceramics is less likely to cause unevenness than crystallization of conventionally used crystalline coating materials. Therefore, if the thickness of the amorphous ceramic coating layer is 1 μm or less, there is no need for practical grinding to flatten the minute irregularities on the cutting edge.

The ceramics mentioned here include zirconium, titanium oxide, titanium carbide, aluminum oxide, other substances generally used as ceramics in vapor deposition, and hydroxyapatite. In particular, the use of hydroxyapatite is preferable because it has good biocompatibility as a biomaterial, and unlike general ceramics, it can be used as a sharp knife that is smooth against the skin.

As a method for coating the cutting edge of the base material with amorphous ceramics, it is convenient to use commonly used film forming methods such as vacuum deposition, sputtering, and ion blasting. If the coating layer is very thin, such as 0.05 μm, the sharpness will be good, but the corrosion resistance may not be very good. Therefore, use a corrosion-resistant blade for the substrate or use a disposable blade. It's good. Substrate cutlery coated with amorphous ceramics can be used not only with materials conventionally used for cutlery such as stainless steel, but also with base materials such as plastic and ceramics. The substrate cutter is loaded as a substrate and the ceramic plate is loaded as a target in each of the above-mentioned devices, and each device is operated in a conventional manner. By arbitrarily adjusting the operating conditions, it is possible to obtain a knife with a hard, flat cutting edge that has an amorphous ceramic coating layer of arbitrary density and thickness, and there is no need for sharpening as there is no wear and tear. . The thickness of the coating layer on the resulting coated cutlery can be adjusted by using a conventional film thickness measurement method, and the amorphization of the coating layer can be easily confirmed by infrared spectroscopy and The nature is confirmed by light reflection.

Effect: When amorphous ceramics are coated on a base cutting tool by vacuum evaporation, sputtering, ion blating, etc., the amorphous ceramic coats the base cutting edge preferentially over the minute irregularities of the material itself, and Coating is applied to flatten the unevenness of the cutting edge. Furthermore, even when excessively coated on a flattened cutting edge, amorphous ceramics are less likely to produce minute irregularities during coating than crystalline coatings conventionally applied to cutlery. For this reason, the cutting edge coated with a thin layer of amorphous ceramics is flat, and since the coating layer is amorphous, it is strongly bonded to the base cutting edge and will not peel off, and is hard, so it can be sharpened like a conventional knife. There's no need (
The sharpness is also good.

The coating material may be ceramic, which is harder or softer than the substrate of the blade, in order to flatten the unevenness of the blade edge. Further, the ceramic to be coated may be a composite.

EXAMPLES The present invention will be specifically described below with reference to Examples.

The steel or stainless steel cutlery used as the base material is shaken in a soda bath, washed with tap water, ultrasonically cleaned in distilled water, washed with acetone, dried in isopropanol vapor, and then heated and dried in air. and used it as a substrate.

Zirconium, silicon carbide, and hydroxyapatite were used as targets.

Hydroxyapatite is a synthetic powder that is washed with water and acetone, dried and then pressure molded, the molded product is immersed in acetone, and the immersed molded product is sintered at 1,000 to 1,200°C for 3 hours. used as.

Example 1゜ Film formation by sputtering Sputtering device RF-planar magnetron target
100 diameter sintered hydroxyapatite sputtering gas 4X10-') Ar substrate
The blade was operated for 30 minutes under the conditions of a net blade forming temperature of 100° C. and a sputtering voltage of 400 V, and a coating film of amorphous hydroxyapatite O, OS μm could be coated on the blade. As a result of X-ray diffraction, the coated hydroxyapatite was found to be amorphous with almost no decomposition products of hydroxyapatite observed.

Example 2゜Amorphous hydroxyapatite 0.5 μm coating was obtained by repeating the same operation as in Example 1, except that a stainless steel knife was used instead of a mesh knife as the substrate and the operation time was changed from 30 minutes to 3 hours. A knife with a membrane was created. The results of X-ray diffraction of the coated hydroxyapatite revealed the presence of a slight amount of CaO attributable to decomposition products.

Example 3 Formation of film by sputtering Sputtering device RF-diode target SiC Sputtering gas 2 x 10-” Torr (Ar) substrate Zirconia blade forming temperature 400°C Sputtering voltage 1,000V 1 hour operation, amorphous 1isic, 1μm coating Film example 4 Sputtering device for film formation by sputtering RF-planar magnetron target
Zr sputtering gas 3 X 10-'Torr (Her Toshima) substrate Steel blade forming temperature 200°C Sputtering voltage 500V 1 hour operation, amorphous 7. Rot, 0.1μm coating film example 5: Formation of film by sputtering Sputtering equipment High frequency spatter gelatin Hydroxyapatite spuck gas
2 X 10-'Torr (Ar) substrate Stainless steel razor blade forming temperature 300℃ Sputtering voltage 600V 10 minutes operation, amorphous hydroxyapatite, 500 coating film example 6゜Changing the operation time from 10 minutes to 30 seconds Example 1 except
The same operation as above was repeated to obtain a razor blade having a coating film of 10 amorphous hydroxyapatites.

Effects of the Invention When ceramics are deposited on a base cutter by vacuum deposition, sputtering, ion blating, etc., an amorphous ceramic film can be easily deposited to any thickness by selecting the base material temperature. Because it is amorphous, the unevenness caused by the material of the cutting edge itself is flattened by the vapor-deposited ceramic, and in addition, the bonding force between the coating and the cutting edge is strong, and the coating is hard, so the coating will not peel off. For this reason, there is no need to sharpen the edge of the blade to make it flat, and it is possible to obtain a sharp knife without sharpening. In addition, there is no need to limit the base knife to conventionally used knives.
By adjusting the temperature of the base material, even materials that have not traditionally been used for cutlery, such as plastic, can be changed into materials that can be used as cutlery by coating them with amorphous ceramics due to their nature. In particular, razors that use hydroxyapatite as a ceramic and are coated with a thickness of 1 μm or less not only have improved corrosion resistance, durability, hardness, and sharpness, but also have a smooth texture because hydroxyapatite has good biocompatibility. It does not cause rash due to loss of shaving force.

Agent: Patent attorney Hideaki Kuwahara

Claims (2)

[Claims] (1) A cutlery characterized by being coated with amorphous ceramics to a thickness of 1 μm or less. (2) The cutlery according to claim (1), wherein the ceramic is hydroxyapatite.