JPS58120760A - Manufacture of rustproof wear resistant metal - Google Patents

Abstract

PURPOSE:To manufacture the titled metal with superior strength, wear resistance and rustproof effect by mixing powder of a rustproof metal with powder of Ti, other metal or the oxide, nitride or carbide thereof and carbon or by further adding powder of a rare earth metal and by sintering the mixture by heating. CONSTITUTION:To powder of a rustproof metal for sintering is added an adequate amount of powder of >=1 kind of component selected from Ti, Si, B, Al, the oxides, nitrides and carbides thereof and a mixture thereof, and they are uniformly mixed and dispersed. Powder of >=1 kind of rare earth metal may be added furthermore. To the uniform dispersion is then added carbon, a carbon forming material, a carbonitriding agent or a mixture thereof, and they are uniformly mixed and dispersed. This uniform dispersion is sintered by heating. The oxide, carbide or nitride of said element is formed during the sintering and dispersed in the sintered molded body to harden the molded body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention incorporates an element that forms a metal compound into a non-rusting metal material such as stainless steel, and when heating for forming, due to the warping caused by the inclusions, extremely high dispersion is achieved. To form oxides, oxides, carbides, or mixtures thereof with a certain property and disperse them in the above-mentioned non-rusting metal material, and if necessary, to contain rare earth elements and react with them to form the non-rust metal material. nature.

In particular, the present invention relates to a method for producing rust-free metals with improved rust resistance and wear resistance.

Examples of rust-free metal materials include stainless steel.

Iron/chromium/nickel based, nickel-cobalt molybdenum/iron based, iron/chromium based, iron/chromium/nickel/titanium based, iron/chromium/nitrogen based, etc. It is known that the amount of iron is extremely small or close to zero.

A conventional method for strengthening these materials is to disperse nitrides, carbides, etc. in minute amounts and uniformly in the metal matrix, dissolve them in a solid solution, and disperse them as minute inclusions. ing. However, these dispersion, dissolution,
In order to achieve minute inclusions or both at the same time, it is necessary to adjust the raw materials in the manufacturing process, maintain the atmosphere during manufacturing, stabilize between heat numbers, and the density of heat treatment and processing.
It must be achieved under good and highly technical control to ensure that quality checks are still necessary.

Moreover, it cannot be said that the entire amount of the heat material thus obtained is used for the same purpose at the same time.

We manufacture a standard material that is widely mass-produced as a rust-free metal material, shape it into a predetermined shape, and then perform special treatment depending on the purpose of use to achieve the desired uniformly dispersed inclusions. I have high hopes that if possible, it would be possible to easily and inexpensively obtain products with excellent workability and utilization efficiency, and with good surface quality. In view of the above-mentioned current situation, the present invention has been developed by uniformly mixing and sintering elemental components that produce surface-tlI compounds such as carbides and nitrides by reaction with a non-rusting metal material, and creating and dispersing the compounds during sintering. It is designed to strengthen metal compounds, such as titanium carbide, titanium oxide, and nitride, compared to the sintering powder of 18.8 iron, chromium, and nickel-based stainless copper heat. The elements that react with titanium are mixed and sintered in a uniformly dispersed state, and the metal compounds are reacted and produced by the sintering heating, and these products are diffused and dispersed in the ground of the stainless steel that is sintered. and sintering with some solid solution and some intervening (hereinafter referred to as dispersion strengthening),
It is an object of the present invention to improve the material properties, in particular the strength, wear resistance and rust resistance.

The example of titanium has already been shown, but other metal compounds include aluminum, boron, zircon, carbide of silica,
Can be used to disperse oxides and nitrides.

Further, according to the present invention, the object can be easily achieved by using the material contained in a dispersed non-corrosive material as a sintering body. Furthermore, one or more elements arbitrarily selected from rare earth metals such as mitschmetal, lanthanum, sericum, samarium, praseodymium, yttrium, neodymium, glometium and other rare earth elements are allowed to coexist with the titanium and other metal compounds, Each or a mixture of carbon, oxygen, nitrogen, etc. generated in connection with the metal compound is reacted in the atmosphere generated during sintering and forming, thereby dispersing and strengthening the metal compound. In this case, each rare earth element has an extremely high reactivity, and a very noticeable #quality improvement (with a weight ratio of 0.1 to 1.0)
It brings about the effect shown in Table 1.

The non-rusting metal sintered body has high corrosion resistance and wear resistance in water, seawater, and chemical solutions.

Next, the present invention will be explained with reference to one embodiment.

18-8 Sf-, 7V S steel 300 mesh powder 10
0 vol*+Titanium powder 5 voj To +Graphite powder 5voI! As shown in Table 1, the sintered body Aa, which is obtained by mixing % of the sintered material and heating and molding it by a normal sintering method, has high strength, corrosion resistance, and wear resistance. Also, instead of the mixed powder titanium 5 VOJ 俤, titanium 2 VO1! % and titanium oxide 3vol! The heated sintered body B to which the powder was added showed similar good properties as shown in Table 1.

Next, the above 18-8 stainless steel 174 powder 100
voj Yu, titanium 5 voI! 'llr p lantern 0
．． As shown in Table 1, the sintered body C obtained by dispersing each powder at 5 vo/% and heating and forming it by the same normal sintering method as above has better corrosion resistance than those of the two examples above. It showed strength and abrasion resistance. Also, the above lantern 0.5vo151
The sintered body obtained by adding 0.5 vol fk of boron to the sintered body showed even better improved properties as shown in Table 1.

Table 1 Examples of changes in properties due to addition of 18-8 stainless steel and dispersion strengthening As shown in Table 1, the sintered bodies dispersion strengthened with rare earth elements showed very remarkable improvements in corrosion resistance and wear resistance.

Metal oxides are reduced to metals, metals generate metal carbides with carbon, and metal nitrides are generated. These products are highly active, and the solid solution in stainless steel is dispersed and strengthened. It is considered that Uniformity due to the dispersion of inclusions is also good.

Similar results were obtained when other types of non-rusting metals were used instead of stainless steel.

Similar results were obtained when boronic acid, aluminum, silicon, and zircon were used instead of titanium. The same was true for the oxides of these metals.

Similar results were obtained when other carbon generating agents and carbonitriding agents were arbitrarily selected from commercially available products in place of graphite.

Even when lanthanum was replaced with one or more of Mitsushmetal and other rare earth elements, extremely good results were also obtained.

Focusing on its extremely good corrosion resistance and wear resistance underwater and in seawater, we tested it on parts for submersible pumps, seawater pumps, sludge pumps, concrete pumps, etc., and found that:
This resulted in extremely low wear and high corrosion resistance. This is the perfect book for these purposes.

It has extremely good heat resistance as well as corrosion resistance, and the ease of molding is also extremely improved.

Furthermore, it is expected to be effective in many fields, and many applications are being developed. As demand continues to increase, new application areas are being developed.

Claims (1)

[Claims] 1. Titanium and silicon in sintering powder of non-rust metal. Boron, aluminum, and their respective oxides]
A homogeneous mixed dispersion containing an appropriate amount of one or more sintering powders arbitrarily selected from carbides, carbides, or mixtures thereof, or one or more arbitrarily selected rare earth metals in the homogeneous mixed dispersion. With a homogeneous dispersion obtained by adding and mixing an appropriate amount of powder for sintering, carbon, a carbon generating agent, a carbonitriding agent, or a mixture thereof is added and mixed, and the mixture is heated and sintered.
A method for producing a non-rusting, wear-resistant metal, characterized in that during sintering, compounds of oxides, carbides or nitrides of the above elements are generated and dispersed and strengthened in the sintered compact.