JPH02230661A - Holder for dry battery mix molding - Google Patents

Abstract

PURPOSE:To enhance the corrosion resistance and abrasion resistance of the above holder by forming part of the inner surface with a ceramic mainly comprising Si3N4 or sialon. CONSTITUTION:A dry battery mix molding holder is formed by fitting a holder 1 made of a ceramic mainly comprising Si3N4 or sialon to a part on the inner surface of a metallic case 2. The ceramic mainly comprising Si3N4 or sialon includes single form or composite of Si3N4 containing Y2O3, Al2O3 or rear earth elements as the auxiliary, beta-sialon obtained by replacing each part of Si and N of Si3N4 with Al and O respectively, alpha-sialon containing Li, Mg, Ca, Y, and rare earth elements except for La and Ce. The dry battery mix molding holder having high ductility, high strength, high corrosion resistance, and high abrasion resistance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a holder for a mixture molded product of a dry battery such as a manganese battery.

[Conventional technology]

The mixture of dry batteries controls the characteristics of the battery, and there are various types depending on the type of battery. For example, in a manganese battery, manganese dioxide 40-60 wt%, acetylene black 5-15%, graphite O-10%, ammonium chloride 10-20%, zinc oxide 1-8%, water 12-2
Mixtures having a composition of 0% are known.

The mixture molded product is made by compression molding the paste-formed silk composition into a mold made of stellite, metal Ti, or other corrosion-resistant alloy. After molding, the mixture molded product is placed in a holder, moved to a predetermined position, and then placed in a zinc case. Stellite or the like has been used as the material for this holder.

[Problem to be solved by the invention]

Although the above-mentioned Stellite holder has excellent corrosion resistance against the mixture, it has recently become clear that as the speed of mixture molding increases, there is a problem in that the wear resistance is insufficient. In other words, the mixture molded product is made of highly corrosive substances, mainly alkali, and is also composed of hard particles, so the material for the holder must be extremely wear-resistant. It's starting to look like this.

An object of the present invention is to provide a holder for a dry battery mixture molded product that has excellent corrosion resistance and abrasion resistance.

[Means to solve the problem]

In the first aspect of the present invention, at least a part of the inner surface is 5i2
N. ! ．． A holder for a dry battery mixture molded product, characterized in that the inner ceramic surface has honing marks, and the inner ceramic surface has honing marks, and the shaft The holder for a dry battery assembly molded product according to the first invention is comprised of diagonal striations or diagonal striations that intersect with respect to the direction.

Types of ceramics include AI, O, . ZrO,,S
iC, Si2N. , Sialon, etc. Among these, especially when ceramics containing S is N 4 or Sialon as a main component are used, good results can be obtained. Ceramics whose main component is Si2N or Sialon are those whose main composition is 3i2N4 or (1 basic composition, for example, St2N, Y20, At, O,...
6s containing rare earth elements etc. as an auxiliary agent, or Si
β-type sialon (general formula S L.-zAlz
()y. Na-z (Z=0-4.2)), or Mx (
α expressed by the general formula Si, At), t(02N),
Type Xialon (0(X(2, M is Li, Mg, Ca,'
Rare earth elements excluding +4 and La*C e) are included alone or in combination. Therefore, by changing the blended components of the ceramic when manufacturing the holder, desired characteristics can be arbitrarily selected, and it is possible to respond appropriately depending on the type of electrolyte agent. Also St2
Ceramics containing N4 or Sialon as a main component have excellent toughness and high strength, so they are less likely to chip and have good mirror workability. Further, as a result of a detailed study of the wear phenomenon of the ceramic surface on the inner surface of the holder, the inventor found that there is a close relationship between the wear life of the holder and the form of polishing marks. Normally, in final polishing for the inside of the holder, the polishing streaks are parallel to the circumferential direction or the polishing streaks are parallel to the axial direction, and in both cases, the scratches are aligned in the same direction, but the former has large initial wear; In addition, the latter promotes wear in the axial direction and expands wear in the longitudinal grooves, and as a result, both are insufficient in terms of the life of the holder. However, in the case where the inner ceramic surface of the present invention has honed marks consisting of oblique striations or oblique striations that intersect with the axial direction, the frictional resistance is reduced during extrusion of the molded product, and as a result, the Initial wear on the ceramic inner surface is suppressed,
In addition to providing an excellent service life, the molded product can maintain a smooth surface over a long period of time.

The holder for a dry battery mixture molded product made of ceramics of the present invention can be manufactured by fitting the ceramic holder to the entire inner surface or a part of an integral or metal case.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

Examples 1-3 St2N4, AIN. Using At, 0, Y20, powder (all particle sizes are 0.5 to 1.5 μm), it was blended to form β-sialon (Z = 0.3) and α + β-type sialon with an α ratio of 25%. , after molding into a holder shape, 1730
Sintering was carried out at 4H at 1 atm of N. After processing it, the shape shown in Figure 1 is Stellite No. Shrink-fitted into case 4.

In addition, Zro, powder (y, o, is ZrO
, 3 mol %) was used to produce a similar holder. In both cases, honing was performed for finishing.

As a comparison material, Stellite No. The amount of wear on the inner diameter was measured after molding 300,000 pieces of manganese battery mixture using a holder made of these three materials in an actual machine. The results are shown in Table 1.

According to the examples shown in Table 1 and above, it can be seen that by using a ceramic holder, the amount of wear on the holder is significantly reduced. In addition, especially when a sialon holder is used, the amount of wear is small and the surface of the molded product is smooth.

Example 4 A holder was manufactured using the same material as in Example 1 with a different finishing method, and the amount of wear on the inner diameter of the holder was measured after molding 10,000 and 500,000 pieces. The results are shown in Table 2.

〔Effect of the invention〕

According to the present invention, the abrasion resistance of the holder can be significantly improved by using ceramics in the holder for dry battery mixture molded products, which has been insufficient in the past, and by providing honed finishing marks on the inner surface. , is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of a ceramic holder that is shrink-fitted into a Stellite case. 1: Holder 22 Case Table 2

Claims (1)

[Scope of Claims] 1. A holder for a dry battery mixture molded product, characterized in that at least a part of the inner surface is made of ceramics whose main component is Si_2N_4 or Sialon. 2. The holder for a dry battery mixture molded product according to claim 1, wherein the inner ceramic surface has honed scratches, and comprises beveled striations or diagonal striations that intersect with the axial direction.