JPS6044305A - Molding die for manufacturing ceramics foam - 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 The present invention relates to a mold used for manufacturing a ceramic foam by heating and foaming a ceramic material and a foaming agent.

Ceramic foams, as typified by glass foams, are lightweight, nonflammable, heat-insulating, workable, and other materials that are widely used in a variety of applications by taking advantage of their respective properties. It is provided. As one of the methods for manufacturing this Cefmix foam, ceramic material 1'
There is a method to obtain Cefmix foam by filling a raw material for Cefmix foam consisting of 1 and a foaming agent into a desired mold and subjecting it to heat and foaming. The mold is 1 more than before.
For example, a metal mold is used, such as a mold made by Nuten Vs.

However, when this mold made by Kanai is used, during the production of Cefmix foam, heating and cooling (-(1')) may cause deformation of the mold due to thermal distortion or foaming pressure of the foaming agent. It is necessary to repair the mold.In addition, if the deformation of the firmness becomes large, the yield of the product will decrease, and the mold will need to be replaced.Also, due to oxidation and wear due to the adhesive, the mold will deteriorate. Life will also be shorter.

Furthermore, during cooling after heating, the ceramic foam is compressed by significant contraction of the mold due to the difference in thermal expansion coefficient between the mold and the Cefmix foam.

Cracks, cracks, etc. will occur. In order to prevent this.

There is a method of providing a restraining mechanism in the mold, but this restraint-releasing mechanism is very complicated, and its installation is difficult.

Handling 1. It takes a lot of time to repair.

Furthermore, the generation of thermal decomposition gas of the blowing agent due to heating and the
Due to volumetric expansion of pyrolysis gas, etc., cavities (cavities) are formed at the bottom of the mold. In order to prevent this, there is a method of providing a large number of gas vent holes in the mold, but it is difficult to completely prevent the occurrence of cavities.

Therefore, the inventors of the present invention solved the above-mentioned conventional problems by using W!
As a result of various researches aimed at solving this problem, the present invention has been completed.

An object of the present invention is to provide a mold for producing a ceramic foam that does not undergo oxidation, consumption, or deformation due to heating, and does not require complicated devices such as a restraint-release mechanism and a large number of vent holes.

That is, 1. The mold for producing the ceramic foam of the present invention is made of ceramic having a porosity of 5 to 50% and a coefficient of thermal expansion smaller than that of the Cefmix foam. This is a characteristic feature.

According to the present invention, the mold for producing a ceramic foam is made of a ceramic having a relatively large porosity and a coefficient of thermal expansion smaller than that of the ceramic foam, so there is no need for degassing holes or loosening of restraints. ? ! 417M is not required, and oxidation, consumption, deformation, etc. due to heating do not occur. Therefore, the durability of the 1W mold is improved.

It is possible to improve the life of the mold, and there is no need for maintenance or maintenance of the rules. In addition, when ceramic foam is manufactured using a mold, the deformation of the mold is extremely small compared to one metal mold, so the yield can be improved.

The present invention will be explained in more detail below.

In the present invention, the mold for making the ceramic foam 11111 has a core fi9a type porosity of 5 to 50%.

These pores are for allowing the thermal decomposition gas of the foaming agent 1 and the volumetric expansion of the gas/air 2, etc. generated when making the Cefmix foam to escape out of the mold. If it is less than 6%, the above-mentioned purpose cannot be fully achieved and cavities will occur at the bottom of the ceramic foam. On the other hand, if it exceeds 50%, the porosity increases, the lQt& strength of the mold decreases, and problems such as cracks and splits occur when the mold is heated.

Further, the mold of the present invention has a coefficient of thermal expansion smaller than that of a ceramic foam manufactured by a method of measurement. In this case, if the coefficient of thermal expansion of the mold is larger than that of the foam to be manufactured,
When the foam is cooled after heating, it is compressed by the shrinkage of the mold, resulting in 5g of cracking and cracking in one foam.
That's because it is.

Here, a typical manufacturing method of the mold for producing ceramic foam will be briefly explained. First, a raw material such as mufit, 7M mina, or cordierite is mixed with a binder such as clay and water to form a raw material mixture. Next, in step 1, fill the plaster mold 1, which has been prepared in advance in the desired shape, with this raw material mixture.

Once the strength has been developed to the extent that it becomes a solid mixture, it is removed from the mold and dried in a room. After drying thoroughly.

The desired mold is obtained by heating and firing at 1300 to 1600°C.

The mold for producing ceramic foam according to the present invention is as follows.

As mentioned above, it can also be produced by a casting method (Nu'I Fupu A Yasuko Ing method), a press molding method, or the like.

In addition, this mold may be made integrally from the beginning in the shape of the desired mold, or a flat plate may be made by an appropriate method as described in 4. It may be assembled using

Below, nine examples of the present invention will be shown.

In order to make a J-shaped mold, a raw material mixture was prepared by mixing light, clay, and water.
It was poured into the plaster mold shown in the figure. Next, the mold was removed, dried, and molded to form a single mold for a 7114-body finger made by Cerami Nokunu. The resulting mold is shown in Figure 2. The meter had an internal dimension of 95 ox (+Box 180 h) and had the characteristics shown in Table 1.

Next, a glass foam was manufactured using the obtained mold for manufacturing a ceramic foam.

Soda lime glass as glass powder 1 part 1
A mixed powder containing subacid IvV as a foaming agent was prepared and filled into the above-mentioned mold for producing a ceramic foam, which had been previously coated with a viscous release agent. Insert it into a gas furnace, heat it, dry it, set it to Rn o t; and bring this temperature to 1.
Holds time. Ko]yo1].

After completing the foaming of the mixed powder by the action of the foaming agent, it is slowly cooled to form a glass foam.The foam is removed from the mold by a suction method, and at this time, there are no cracks or cracks in the foam. The total was <<1;

The glass foam obtained above is 950X630X
1# is also a type 100 plate-like body with M17 converted into an IH with 4 L volumes. The damaged glass foam has no problems such as formation of cavities, fPL cracks, cracks, etc., and l'1. The table was not filled. In addition, the direct tightness of this encapsulated glass)I(
゛ke0, 2091/c4. Water absorption rate is O, fl 9 vo
l %, IT life: 'i strength is' 28 kg/ca
, the bending strength was 11.9 kq/r casting.

In addition, no ITI, ◇ cracks, etc. were observed in the molds used for this production.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the plaster mold used in Example 1 of the present invention to mold a mold for producing Cefmitsukun foam. Figure 2 is a diagram showing the plaster mold used in Example 1 of the present invention. It is a figure which shows the molding for manufacturing a ceramic foam body. 1...Stone;)H2,g...Gypsum mold (lower mold). 8... Gypsum mold (upper mold), 4... Raw mixture injection 0.
5... Space filled with molded polishing raw material mixture. 6... Molding mold for producing ceramic foam. Patent Applicant Toyota Central Research Institute Co., Ltd. Figure 7 Mutual Ending 2nd

Claims (1)

[Claims] In a mold used to manufacture a ceramic foam by heating and foaming a ceramic material and a foaming agent, the mold has a porosity of 5 to 50% and a coefficient of thermal expansion smaller than that of the Cefmix foam. A mold for producing a ceramic foam, characterized in that it is made of ceramic.