JPS6027505A - Manufacture of ceramic structure - 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 [Technical Field of the Invention] The present invention relates to a method of manufacturing a ceramic structure. Specifically, the present invention relates to a method of manufacturing a ceramic structure in which a plurality of green ceramic materials are combined and sintered to form an integral structure.

[Technical background of the invention and its problems]

Various uses of recent ceramic materials have been developed in order to effectively utilize their properties. Along with this, in the past, it was used simply in the shape of a plate, a rod, a cylinder, a polygon, etc., but recently it has been used as a laminate of plates or a combination of plates and rods, and even in the form of a plate. There is a growing demand for vertical combinations of objects. In response to these demands, it is known that a plate-shaped laminate of any thickness can be obtained by hot-pressing a plurality of green sheets made by the doctor blade method and then firing them. be. In addition, structures having a plate and a rod or a convex portion on a plate as shown in Figs. 1 and 2 can be formed by integral molding with a mold,
Alternatively, it is manufactured by sintering it as a block and then grinding it by mechanical processing, and these methods are also known methods.

However, in the conventional method, for example, in the case of the above-mentioned plate and zelkova, or even in a structure having a convex portion on the plate, when the ceramic material is a hard material such as alumina, the following problems occur.

That is, it is extremely difficult to grind by machining after sintering due to its hardness, and the manufacturing cost is also significantly increased. on the other hand,
Even if you make a mold in advance and perform the molding, the cost of the mold is expensive as well as the cost of the mold is high as we have been producing a wide variety of products in small quantities recently.
A large number of molds must be prepared depending on the product type, and there is also a large amount of time wasted in making the molds.
Due to shrinkage of the ceramic material due to sintering, if a sintered product of the expected dimensions cannot be obtained, there is a problem in that expensive molds cannot be used.

These conventional problems are caused by the ff1f mechanical grinding process.
Although EL was mainly noticeable in hard materials such as alumina materials, problems related to molds were common to other general materials.

[Purpose of the invention]

The present invention solves the above-mentioned problems and provides a manufacturing method for easily obtaining a complex-shaped ceramic structure with excellent strength.

[Summary of the invention]

In the method of the present invention, as shown in FIG.
A plurality of molded products 1.2 are prepared, and a groove 3 is formed in at least one of the molded products 1 at a gap that allows another adhesive molded product 2 to fit therein. Next, slip (sludge) is made of the same inorganic material as these unfired molded products and has a solvent and A-ingu component similar to that of the unfired molded product.
is applied to the groove 3 and the adhesive portion of another adhesive molded product 2, and then the adhesive molded product 2 is sandwiched and fixed in the groove 3.

Furthermore, when making a box-shaped integral structure as shown in FIG.
・Also 1. Apply the slip described above so that the coated areas are in contact with each other.

By putting the unfired molded product in this way into a firing furnace and firing it, complex-shaped ceramic structures with arbitrary wall thicknesses can be manufactured easily, at low cost, and with high strength without using any special molds. We can manufacture products of superior quality.

〔Effect of the invention〕

The present invention has the following effects.

b) Conventionally, when attempting to integrate complex-shaped ceramic structures such as those shown in Figures 3 and 4 and make them strong by firing, a dedicated and expensive mold was required, or other casting methods were used to form the molded product. In order to obtain this, an expensive mold was required. However, the present invention does not require any such mold. If you simply make an unfired molded product to the required thickness and size, and one of them has a jig to create a groove according to the required shape, you can respond to any size and shape requested by the user, and therefore it is that much easier. And it can be manufactured at low cost.

Mouth) The fact that a separate mold for the lees is not required means that there is no time loss in making a mold, which takes two months per layer, and production can be completed in a correspondingly shorter time.

c) For example, if the structure is as shown in Figure 3, or if the height of the part 2 in Figure 3 is relatively low and the wall thickness is thick, the structure can be made into a rectangular parallelepiped without using a special mold. Although it is possible to shape the entire block into a large block, fire it, and then cut and grind the unnecessary parts using mechanical grinding, the grinding cost would be enormous. Particularly for alumina products, because of the high price tag, the cost is about the same as or more than making a special mold.

In contrast, the present invention has a structure in which the two members shown in Fig. 3 are prepared in advance at arbitrary heights and widths and are inserted into the groove of the bottom plate member 1, so that no grinding process etc. is required after firing. This is not necessary, which makes it possible to manufacture at a lower price and in a shorter period of time.

2) Furthermore, when attempting to manufacture structures with complex shapes by firing, the dimensions before and after firing will differ due to shrinkage due to firing.

Therefore, it is necessary to experimentally confirm the degree of shrinkage (shrinkage rate) in advance and use the data obtained to determine the dimensions of the green molded product.

To obtain this shrinkage rate, if you use a mold, you will need a test mold with iU+ value in advance to determine the shrinkage rate, and according to that value, you will also need a mold for the product. Double mold costs are required. On the other hand, the present invention combines unfired molded bodies cut into arbitrary dimensions even when determining the shrinkage rate,
All you have to do is fire it and find the shrinkage rate by comparing their dimensions, and there is no need for any special and expensive molds, which is much more advantageous in terms of cost.

[Embodiments of the invention]

Aluminum oxide (Al, o,) 92 wt% (hereinafter referred to as the interval), silicic anhydride (Sin) 5%, magnesium oxide (Mgo), and calcium 1.5% each were weighed and the average particle size was determined using a vibration mill. The mixture was mixed, ground, and dried to a size of 1.8 to 19 μm.

Next, a solvent and a binder plasticizer were added to the pulverized powder in the following proportions to adjust slippage.

Alumina powder 100 parts Trichlorethylene 20〃 n-butanol 10〃 Bootrachlorethylene 8〃 Polyvinyl butyral 5〃 T B P 2 # The thus obtained slip was molded to a thickness of 0.5 mm by the Doctor Prede molding method. Five unfired sheets (green sheets) were obtained.

Stack 4 of these green sheets and make 1 (lOKli')
/r! The material was heat-pressed at 100° C. for 40 minutes to obtain a pressure-bonded sheet with a thickness of 18 mm.

Next, in order to make a structure as shown in Fig. 4, the bottom plate, the side plates 2.
, 3, '4, and 5 were cut as shown in FIG. 5, FIG. 6, and FIG. 7, respectively.

In Figure 5, the thickness of the groove 6 side plate +Q, 3 nrrn
It was easy to process because it was about the same width and the material to be processed was an unfired green sheet. The groove portion 6 in FIG. 5, the portion of the side plate inserted into the groove portion 6 in FIGS. 6 and 7, and the portion that contacts each other when assembled as shown in FIGS. 6 and 7, that is, the portion 7 in FIG. In 8,9.10 parts, 1゛(average particle size obtained by vibration mill grinding in Section 1), alumina powder of 8 to 19 μm,
Apply a slip made of terpine all. Thereafter, the side plates 2.degree. 3.4.5 are inserted into the grooves 6 and bonded to each other. In this way, the assembled structure +400
At a firing temperature of 1500°C to 1500°C, the binder was removed, fired, and slowly cooled for about 30 hours, and the bottom plate and side plate had good adhesion and were aged as one piece.

(,'!' The shrinkage rate of 31 ton per 6 liters can be achieved by making a test product in which the dimensions of the bottom plate, side plate, groove, etc. are set accurately to the set values, assembling it, and firing it.
It was possible to obtain a hole in the cylinder without using a special mold.

In other words, the dimensions before firing of the fixed points in 11-1, ■, and the dimensions after firing, e! It! l 7i: By doing this, we obtain the degree of contraction due to ヅ+ρ formation in the cylinder, and using this (n'4,
We determined the dimensions of one li item required at a crossroads.

Furthermore, shapes such as triangular tubes or cylindrical shapes as shown in No. 8 (1) and No. 91 (1) can also be easily manufactured by applying this embodiment.

Furthermore, the method of the present invention is applicable to the entire transportation of ceramic material 1.
C is possible.

[Brief explanation of drawings]

f(', Figures 1 and 2 are perspective views of ceramic structures conventionally made mainly using molds, etc., and Figures 3 and 4 are box-shaped ceramic structures made by the method of the present invention. 4:11
5 to 7 are front views of the structural member of FIG. 4, and FIGS. 8 and 9 are perspective views of the ceramic structure obtained by the method of the present invention. 1: Bottom plate, 2, 3, 4. ! 5: Side plate, 6: (I part, 7
．． 8,9. io: Adhesion between side plates. Figure 1 Figure 3 Figure 5 Figure 8 Figure 2 Figure 4 Figure 9

Claims (1)

[Claims] A step of preparing a plurality of unfired molded products made of the same inorganic material, solvent, and binder, and at least one of the molded products.
forming a groove into which another molded product can be inserted; a step of turning the inorganic material into a slurry and creating a slip with a solvent that scatters at 300°C to 400°C;
It is characterized by comprising the steps of applying the adhesive to the groove and the mutually adhering portion of the molded product, then inserting the molded product into the groove and bringing the molded products into close contact with each other, and firing them. Method of manufacturing ceramic structures.