JPS6188033A - Spring made of ceramics - Google Patents

Abstract

PURPOSE:To get rid of any deflection and reduction in coefficient of resiliency in the ambient atmosphere of high temperature and provide high corrosion resisting, chemicals resisting and non-magnetic characteristics by shaping a spring out of ceramics. CONSTITUTION:A spring which is shaped in the cylindrical, plate-like, dish-like and spiral forms is made of alumina, silicon carbide, silicon nitride, cyaron or similar ceramics having the strength against high temperature, corrosion resistance, durability against chemicals, electrically insulated characteristics and non-magnetic characteristics.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to alumina, silicon carbide, silicon nitride, sialon,
Various mechanical devices made of ceramic materials such as zirconia,
This invention relates to a ceramic bullet body suitable for electronic equipment, chemical equipment, etc.

[Conventional technology]

Bullet bodies (springs) of various sizes that have been widely used
Almost all of them are made of metals such as steel and phosphor bronze, except for very special ones such as synthetic resin types.

Therefore, it is relatively easy to equip, and the elastic limit range is wide (
However, when used for a long time, the elastic modulus of the metal material decreases due to aging, and it is susceptible to rust and corrosion, so it should not be used in places with a lot of moisture. Moreover, if exposed to corrosive gas or exposed to acid or alkaline liquid, the elastic modulus would not only change due to chemical corrosion, but there was also a risk that the bullet could break.

Furthermore, if the metal is used in a place where the temperature is relatively low, not only will the metal soften and the elastic modulus will decrease significantly, but also the metal bullet will not only be used in an atmosphere below the temperature that causes such a decrease in the elastic modulus. In addition to oxidation of the surface of the bullet, the elasticity of the bullet itself changes due to thermal expansion in particular.

Furthermore, metal bullet bodies are electrically conductive, and spring steel (carbon steel) is magnetic, which often causes problems when used in precision machinery, electronic equipment, etc. .

[Problems to be solved by the present invention]

” In view of the above, the present invention has been developed to create a non-magnetic, electrically insulating elastic body that exhibits great corrosion resistance and chemical resistance in a high-temperature atmosphere without causing deflection or decreasing the elastic modulus. This is something I do with Tara.

[Means for solving problems]

The bullet body according to the present invention has high heat resistance strength, corrosion resistance, chemical resistance,
It is characterized by being electrically insulating and non-magnetic, and made of ceramic materials such as alumina, silicon carbide, silicon nitride, and sialon, which have traditionally been considered to be highly hard and brittle materials.

〔Example〕

A cylindrical coil spring was formed using various ceramic materials. As for these specifications, when the wire diameter φ=0.65 mm and the amount of shrinkage when placed in a tube were measured, the characteristics at room temperature were as shown in Table 1.

As can be seen from Table 1, although ceramic materials have high hardness and a large Young's modulus, they have a relatively large amount of shrinkage, and can be put to practical use as constituent materials for bullet bodies. was confirmed.

Of the above ceramic materials, silconiace
Table 1 Table 2 No decrease in elastic modulus or mechanical strength was observed in the bullet bodies made of materials other than ramic even in a high temperature atmosphere of approximately 700°C.

Further, the physical properties of the main ceramic materials constituting the bullets as described above are shown in Table 2. The zirconia ceramic used here is a partially stabilized zirconia ceramic having a mixed structure of tetragonal and cubic crystals and excellent mechanical properties.

Furthermore, in the above embodiment, a cylindrical coil spring is used; It may be composed of a spring, a spiral spring, etc., and in fact,
A plate spring made of the above ceramic material exhibited almost the same characteristics.

By the way, if the material constituting the bullet body is alumina ceramic and single crystal sapphire, it is sufficient to machine a plate material or cylindrical material into the desired shape using a drawn boundary, but other materials such as zirconia, alumina (polycrystalline), and nitrided material can be machined into the desired shape. Silicon, silicon carbide, sialon, etc. are made by forming raw materials prepared in advance into a leaf shape into a predetermined bullet shape, and then sintering at a firing temperature and atmosphere suitable for each ceramic material.

In addition, the raw materials prepared in the shape of a leaf are formed into almost a predetermined shape, held at a temperature lower than the sintering temperature, and once calcined, it is processed into a more complicated shape, or after shaping and finishing. It is manufactured by performing main firing.

Further, plate-shaped or plate-shaped bullet bodies can be made by powder molding or by punching a green sheet into a predetermined shape and firing it.

〔Effect of the invention〕

As shown in Ijh, the ceramic bullet body according to the present invention is Ijh
It fully demonstrates its spring function without stretching or deflecting due to thermal expansion even in a warm environment, and has excellent corrosion and chemical resistance, so it can last for a long time even in corrosive atmospheres and liquids. Can maintain stable intestinal health. Furthermore, it will not be affected even in places where magnetism acts.
Moreover, because it has electrical insulation properties, it can be used in various electronic devices, etc., and can be applied to areas where wear occurs, not only general industrial machinery, but also medical equipment,
It can be used in the food industry, marine equipment, chemical plants, etc., and can provide an excellent bullet body that can be used for a long period of time with high precision and stable elasticity.

Claims (1)

[Claims] A ceramic bullet body formed of a ceramic material such as alumina, silicon carbide, silicon nitride, sialon, zirconia, etc. into a coil shape, plate shape, plate shape, spiral shape, etc.