JPS6374975A - Ceramic composite body - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ceramic composite. Furthermore, in detail, it is resistant to thermal shock, and the raw material particle size and amount of fiber added can be changed.
The present invention relates to a ceramic composite for firing whose density can be changed by 4.

[Prior technology] Various crucibles and materials for firing such as molded pods used at high temperatures have traditionally been made of ceramics such as magnesia, alumina, and cordierite. In the field of ceramic firing materials for parts, they are often used under severe conditions, such as exposure to extremely high temperatures, rapid temperature changes, and special atmospheres. In such cases, conventional firing materials have many drawbacks, such as being weak against thermal shock and often losing strength as a structure against special atmospheric gases, and are not suitable. In particular, with the recent development and sophistication of electronic equipment, and the current situation where products of increasingly high purity are required,9 even stricter measures must be taken to prevent the formation of contours and minerals and to produce materials for firing even under severe conditions. High-grade materials that do not change in properties are desired.

Furthermore, crucibles and the like are required to be fired at high temperatures and used at high temperatures, and the usage conditions are becoming increasingly strict.

Therefore, high temperature stability is required, and expansion due to temperature changes,
Highly resistant to changes in properties. Relatively inexpensive materials are required.

Since the MgO sintered body is dense and has a high melting point, it is a monolithic and good material for firing, and has been used as a firing pod material and a material for crucibles. However, the MgO sintered body is extremely susceptible to thermal shock and easily cracks due to thermal shock during firing, so it cannot be used under severe conditions.

[Problems to be Solved by the Invention] An object of the present invention is to provide a composite ceramic body for use in various firing setter materials, firing pod materials, crucibles, etc. that meets strict requirements of 9 or more. Another object of the present invention is to provide a composite ceramic body that does not generate cracks at high temperatures and has excellent heat resistance, and a method for manufacturing the same. A further object of the present invention is to provide a composite ceramic material that can be used in a crucible for producing electronic materials used for high-temperature firing. Another object of the present invention is to provide a composite ceramic material that has improved strength and high temperature resistance and can be used to manufacture firing pods, crucibles, etc., and a method for manufacturing the same.

[Means for Solving the Problems] The present invention involves adding zirconia fibers to fine MgO powder.
A ceramic composite for firing is produced by mixing ~40% by weight, adding an appropriate amount of binder to obtain a mixture of appropriate viscosity, molding it into an appropriate shape, and firing it. Furthermore, a ceramic for firing characterized in that 1 to 40% by weight of zirconia fiber is mixed with fine powder of lMgO, an appropriate amount of binder is added, a mixture of appropriate viscosity is obtained, the mixture is formed into an appropriate shape, and then fired. This is a method for producing a composite.

The present invention has added tough zirconia fibers. A composite material of a sintered body of MgO fine powder is used as a firing material, and the material is suitable for crucibles and firing shells that can prevent thermal shock cracks. Using appropriate amounts of powder, zirconia fibers, and an appropriate binder as raw materials, mix these in an appropriate ratio to form a mixture with an appropriate viscosity, and mold it into an appropriate shape by slip casting, mold pressing, extrusion molding, suction press molding, etc. This molded body was heated to about 14
It was fired at a temperature of 00 to 1800°C.

The ceramic composite of the present invention has a raw material particle size of fine powder,
By changing the amount of zirconia fiber added, properties such as the density of the ceramic composite that can be manufactured can be changed. The smaller the raw material particle size is, the higher the density of the produced ceramic composite becomes.

On the other hand, the density decreases as the amount of zirconia fiber added increases.

Furthermore, by changing the aspect ratio of the zirconia fibers used, the properties of the produced ceramic composite can be changed. That is, by adding fibers with a large aspect ratio, the density of the produced ceramic composite can be reduced, and a ceramic body with a small heat capacity can be produced.

The ceramic composite of the present invention is a zirconia fiber-added composite (7'S Evelyt) type material, and therefore can be used as a firing material such as setter material and Naya material that are resistant to thermal shock. Since the zirconia fibers act to pull the matrix ink, strain energy is absorbed and this has the effect of alleviating the occurrence of cracks. That is, the strength is further improved by the zirconia fibers, resulting in a ceramic composite for firing that has high high-temperature elasticity.

In the ceramic composite of the present invention, the density of the produced ceramic composite can be controlled and changed to some extent by the amount of added zirconia fibers, that is, a porous ceramic composite is created.

The ceramic composite obtained by the present invention is as follows.

Since it is a polymorphic body and can be molded into any shape during molding, a sintered body of any shape can be easily obtained. A high-grade sintered body of any shape can be obtained.

According to the present invention, there are nine inventive ceramic composites.

It is preferable to perform firing within a firing temperature range in which the matrix MgO and zirconia fibers do not react. This is because the zirconia fiber does not deteriorate thermally during firing. In addition, the magnesia in the matrix reacts with the zirconia fibers and they melt together, causing the zirconia fibers to lose their mechanical strength or be thermally degraded, so firing must be done in a way that can prevent this. No.

The raw material finely powdered MgO is preferably as fine as possible to improve sinterability.

The fine powder raw material can be easily manufactured using the usual Toramix fine particle manufacturing technique, such as the sol-gel method using metal alkoxide as a starting material.

Zirconia fibers that can be used include commercially available zirconia fibers such as Safil (
Saffil) Alumina fiber can be used sufficiently. Also,
Its usable aspect ratio range is approximately 10-1000
An aspect ratio of 0 is preferable, and the aspect ratio can be selected according to the desired properties of the firing material.

1iX product with addition q of zirconia fiber is 1~4O
ffi amount%, and it is suitable to select 9 according to the desired properties. If the amount is 1% by weight or less, no significant improvement in thermal shock resistance or composite strength is observed;
If more than % by weight of fiber is contained, polling and flapping will occur and the product will be difficult to handle.
The amount of electricity is 0%.

The ceramic composite obtained by the present invention is as follows.

Setter materials for firing, pods for firing, melting crucibles.

Crucibles for various types of glass, crucibles for general metal melting.

Suitable for crucibles for firing electronic ceramics, refractory sheaths, etc.

Next, a method for manufacturing a ceramic composite according to the present invention will be described, but the present invention is not limited to the following ninth embodiment.

[Example] Example 1 MgO fine powder raw material and zirconia fiber were first
Mix well in the weight part ratio shown in the table, add an organic binder, mix and knead, mold this, and then heat it in an electric furnace for about 1 hour.
It was baked at 600°C for about 3 hours.

The density of this sintered ceramic composite was measured. The results are shown in Table 1.Furthermore, when a thermal shock test was conducted, it was found that the thermal shock resistance was higher and the high temperature strength was improved compared to the results of the MgO single component monolithic body.

Table 1 In the table above, MgO and fiber are.

The proportions are shown in parts by weight.9 Both were molded by press molding.

Example 2 Next, the aspect ratio of the zirconia fibers was changed, and 100 parts by weight of fine powder magnesia and 2 zirconia fibers were added.
0 parts by weight were mixed, kneaded with a binder, molded, and baked at 1600°C for about 3 hours in the same manner as in Example 1. When the density of the produced fired body was measured, the results were as shown in Table 2 below.

By changing the aspect ratio of the zirconia fibers as shown in Table 2 and above, the density of the Hiramix composite can be controlled.

Smaller aspect ratios allow the creation of denser ceramic composites. That is, when the aspect ratio is small, mixing is easy, the two structures are uniform without forming fiber clumps, and a fired body with high density can be produced.

Conversely, by using zirconia fibers with a large aspect ratio, a ceramic composite with a low density could be manufactured, that is, a ceramic composite with a small heat capacity could be provided.

[Effects of the Invention] Due to the structure and manufacturing method described above, the ceramic composite of the present invention has, firstly,
We have provided setter materials, pod materials, and crucible materials for firing that have excellent thermal shock resistance.Secondly, we have developed a ceramic composite whose heat capacity and density can be adjusted by changing the ratio of raw materials and the aspect of fibers. Thirdly, by changing the fine powder particle size of the WL material, the fiber addition 'xk, and the fiber aspect, the density and heat capacity of the manufactured ceramic composite can be reduced, and the furnace interior can be shortened. We have been able to provide a ceramic composite material that can be used for firing setters, firing pods, crucible materials, etc., which can be used for firing setters, firing shells, crucible materials, etc., which can be used for firing setters, firing shells, crucible materials, etc., which can produce uniform heat loss and reduce heat loss. , fourthly, the strength was improved by 1. scientific.

Technical effects such as the ability to manufacture thermally stable firing units, pods, crucibles, etc. were obtained.

Claims (2)

[Claims] (1) 1 to 4 zirconia fibers added to MgO fine powder
0% by weight, add an appropriate amount of binder to obtain a mixture of appropriate viscosity, mold it into an appropriate shape, and bake it.
A ceramic composite for firing, characterized in that it has been manufactured. (2) 1 to 4 zirconia fibers added to MgO fine powder
1. A method for producing a ceramic composite for firing, which comprises mixing 0% by weight, adding an appropriate amount of a binder to obtain a mixture of appropriate viscosity, shaping the mixture into an appropriate shape, and firing.