JP2002087874A - Earthenware product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide large-sized plate earthenware products which can be exactly designed in product shapes and dimensions after firing while maintaining necessary mechanical strength as the earthenware products, are good in surface accuracy and dimensional accuracy, hardly give rise to the degradation in yield based on shrinkage and deformation and are better in efficiency of packing into kilns and productivity than heretofore. SOLUTION: The earthenware products consists of earthenware bodies and glaze layers formed in the necessary segments on the bodies. The products may be manufactured by a method including a process step of firing the products at 1,100 to 1,300 deg.C. The shrinkage rate of firing in the longitudinal direction of the bodies in the firing process step described above is <=6%; the softening deformation rate of the bodies in the firing process step is <=10 mm, the bulk density of the bodies is 1.6 to 2.1 g/cm3 and the relation between the bulk density and bending strength (Sb) of the bodies is Sb>60×Db-60 (MPa). The CaO component segregation parts where CaO components are segregated scatter in the bodies. The earthenware products formed by using such bodies are the large-sized earthenware products having plane parts as represented by draft chamber top boards, kitchen front boards, step plate, counters and surgical tables.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized pottery product having a flat portion represented by a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, and an operating table.

[0002]

2. Description of the Related Art Products such as a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, an operating table and the like are large plates having a relatively large flat surface, and are required to have surface accuracy and dimensional accuracy. Further, it is sufficiently considered that an impact or a load is applied in a use condition, and therefore, a mechanical strength that does not cause any problem in practical use is required. Therefore, the draft chamber top plate can be fired at a temperature of 1100 to 1300 ° C, which is easy to secure the stain resistance and chemical stability of the glaze layer in a single firing, especially for glazed ceramics. Glazed hard pottery bases and fused bases which can also exert a proper strength have been generally used. In addition, a cement-based material such as a calcium silicate plate, or the above-mentioned hard pottery base material or fusible base material such as a tile has been generally used for a kitchen front plate. In addition, the above-mentioned hard porcelain base, fusible base, or natural stone has been generally used for the contaminated stone because the surface stain resistance and mechanical strength are regarded as important. In addition, artificial marble, woodwork, stainless steel, natural stone, and other resins, organic, and metallic materials have been generally used for counters because they are easy to increase in size and easily secure surface accuracy and dimensional accuracy.

[0003]

However, in the case of a hard porcelain base material or a fusible base material, the amount of shrinkage during firing and the amount of deformation were large in order to harden until a sufficient mechanical strength was exhibited. For this reason, it is difficult to accurately design the product shape and dimensions after firing, which leads to cracks, variations in shape, and deterioration in step precision, and a polishing step is required or pulled. May cause a decrease in yield. In cementitious materials, cracks due to hydration expansion and contamination due to eflorescence,
As for the surface portion, since organic coating is generally used, there are drawbacks of low hardness and poor durability. For resin and metal,
Natural stones that have low surface hardness, are easily damaged, are liable to undergo deterioration such as discoloration and rust, and have excellent durability are very expensive. Therefore, in the present invention, it is possible to accurately design the product shape and dimensions after firing while maintaining the mechanical strength required as a ceramic product, and obtain a product having good surface accuracy and dimensional accuracy, and shrinkage and deformation. It is an object of the present invention to provide a large-sized pottery product that is less likely to cause a decrease in yield based on the above, and that is more efficient and more productive in kiln packing than in the past.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a pottery product comprising a pottery body and a glaze layer formed on a required portion of the pottery body. Glazing the necessary parts as necessary, 1
It can be manufactured by a method including a step of firing at a temperature of 100 to 1300 ° C., wherein the firing shrinkage in the longitudinal direction of the base in the firing step is 6% or less, and the softening deformation of the base in the firing step The amount is 10 mm or less, and the bulk density (Db) of the base is 1.6 to 2.1 g.
/ Cm ³ and the bulk density and bending strength (S
The relationship with b) is Sb> 60 × Db-60 (MPa), and the ceramic product is a large plate having a flat portion represented by a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, and an operating table. A ceramic product is provided. By doing so, shrinkage and deformation in the firing step are suppressed, the product shape and dimensions after firing can be accurately designed, and reduction in yield due to shrinkage and deformation hardly occurs. Further, since it has sufficient mechanical strength with respect to the bulk specific gravity, it is lightweight and hardly suffers from impact destruction, load destruction and the like in practical use.

In a preferred embodiment of the present invention, there is provided a ceramic product comprising a ceramic body and a glaze layer formed on a required portion of the body, wherein the body comprises a crystal phase mainly composed of mullite and quartz. When a green body comprising a glass phase composed mainly of SiO _2, Al ₂ O _3, cristobalite optionally andalusite, sillimanite, kyanite, and a crystal phase comprising a mineral selected from corundum, green body Is mainly composed of 50 to 65 wt% of SiO ₂ ,
l ₂ O ₃ 30~45wt%, alkali oxides 0.1~2w
0.1% to 10% by weight of a divalent metal oxide, containing at least a CaO component as the divalent metal oxide component, wherein the CaO component is segregated in the base material.
Draft chamber top plate, wherein O component segregation portions are scattered, and the crystal phase is dispersed in the glass phase, and a composition ratio of the glass phase to the base material is less than 60 wt%. , Kitchen front plate, dirty stone,
It is an object of the present invention to provide a large porcelain product having a flat portion represented by a counter and an operating table. By doing so, Ca
O-component segregated CaO component segregated parts are scattered, while maintaining the required mechanical strength, firing shrinkage becomes sufficiently small, and the product shape and dimensions after firing can be accurately designed. In addition, it is possible to provide a pottery product that is less likely to cause a decrease in yield due to shrinkage or deformation and that is more efficiently packed in a kiln and has higher productivity than before. Further, by controlling the ratio of the glass phase to less than 60 wt%, large shrinkage due to liquid phase sintering can be suppressed, and the firing shrinkage can be suppressed to 6% or less.

In a preferred embodiment of the present invention, the above C
The relationship between the abundance ratio (weight ratio) of Ca and Na, K, and Mg in the aO component segregation section is Ca> Na, Ca> K, Ca> M.
Make sure that all of g are satisfied. By doing so, the component of the CaO component segregation part is greatly different from the glass phase component, so that the effect of the CaO component segregation part being scattered is emphasized.

[0007] In a preferred aspect of the present invention, the amount of the CaO component in the substrate is 1 wt% or more. By setting the amount of the CaO component to 1 wt% or more, an excellent relationship between bulk specific gravity and strength can be obtained. CaO
It is considered that when the amount of the component is large, the shrinkage of the glass phase accompanying the liquid phase sintering can be suppressed to a small value.

[0008] In a preferred aspect of the present invention, the relationship between the CaO component and the other divalent metal oxide component in the base material is such that the content of the other divalent metal oxide is 50 parts by weight or less based on 100 parts by weight of CaO. To be there. By doing so, an excellent relationship between bulk specific gravity and strength is obtained. It is considered that when the CaO component is large, the shrinkage accompanying the liquid phase sintering in the glass phase can be suppressed to be small.

[0009] In a preferred aspect of the present invention, the amount of quartz in the substrate is 20 wt% or less. By doing so, it is possible to suppress an excessive increase in the coefficient of thermal expansion of the base material, and in a product having a large and complicated structure such as a pottery product, cracks are less likely to occur in a temperature lowering process during firing. .

In a preferred embodiment of the present invention, when the base contains corundum, the amount of corundum is 20 wt.
%. Since corundum has a high Young's modulus, it is possible to obtain a great strength-improving effect by uniformly dispersing it in a substrate. When the base contains corundum, the amount of corundum is preferably set to 20 wt% or less. This is because if corundum has a higher specific gravity than other minerals and a glass phase and contains more than 20 wt%, the specific gravity of the base material becomes large and a burden is imposed upon construction and the like.

In the present invention, a step of forming a raw material, a step of glazing a necessary portion as necessary,
A porcelain product that can be produced by a method including a step of firing at a temperature of about 1300 ° C., wherein the base material contains a clay mineral, quartz, a raw material containing an alkali metal, and a raw material containing a divalent metal; The mineral is a mineral containing at least one selected from kaolinite, dickite, halloysite, sericite, and pyrophyllite. As the divalent metal-containing raw material, at least wollastonite or limestone or anorthite is contained. The amount of the quartz is 30 wt% or less based on the raw material, the amount of the clay mineral is 30 to 90 wt% based on the raw material, and the raw material has an average particle size based on a laser diffraction particle size analyzer. The particle size is adjusted so that the diameter is 3 to 10 μm,
A ceramic product is provided, wherein the ceramic product is a large plate having a flat portion represented by a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, and an operating table. By using limestone or wollastonite or feldspar as a raw material used to introduce CaO, these raw materials have a CaO component of MgO, Na ₂ O,
Since it does not form a solid solution or compound with a component such as K ₂ O, a portion where the CaO component is segregated in the fired body is easily formed and scattered. Therefore, while maintaining the required mechanical strength, the shrinkage of firing becomes sufficiently small, and the product shape and dimensions after firing can be accurately designed.
It is possible to provide a pottery product that is less likely to cause a decrease in yield due to shrinkage or deformation and that is more efficient and more productive in a kiln than in the past.

In the present invention, a step of forming a base material, a step of glazing a necessary portion as necessary, 1100
A ceramic product which can be produced by a method including a step of firing at a temperature of 1300 ° C., wherein the raw material is a clay mineral, quartz, a raw material containing an alkali metal oxide, a raw material containing a divalent metal oxide, Contains small weight loss raw materials, the clay minerals are kaolinite, dickite, halloysite,
A mineral containing at least one selected from sericite and pyrophyllite, wherein the amount of the quartz is 30 wt% or less based on the raw material, and the clay mineral is 30 to 90 wt% based on the raw material. The raw material having a small ignition loss is 5 to 50% by weight based on the raw material, and the raw material is sized so that the average particle diameter based on a laser diffraction particle size analyzer becomes 3 to 10 μm. A ceramic product is provided, wherein the ceramic product is a large plate having a plane portion represented by a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, and an operating table. By containing a raw material having a small ignition loss, firing shrinkage based on the ignition loss is reduced.

In a preferred embodiment of the present invention,
At least wollastonite or limestone or anorthite is contained as the valent metal-containing raw material. By the synergistic effect of the effect of using a small raw material of ignition loss and the effect of using limestone or wollastonite or anorthite as a base material used to introduce CaO,
In addition, excellent shrinkage due to firing can be obtained and excellent strength can be obtained. In a preferred embodiment of the present invention, the raw material having a small loss on ignition is chamotte, and the main mineral of the chamotte is at least one mineral selected from mullite, cristobalite, quartz, and corundum. Is 1% by weight or more. By using a crystalline chamotte having an amount of CaO of 1 wt% or more, the mechanical strength is improved by the crack deflection effect, and the firing shrinkage can be reduced by reducing the ratio of the glass phase.

In a preferred embodiment of the present invention, the raw material having a small loss on ignition is a hollow glass mainly composed of SiO ₂ and Al ₂ O ₃ . By doing so, the pores of the hollow glass remain as closed pores in the substrate, so that a substrate having a low bulk specific gravity is obtained for the strength.

In a preferred embodiment of the present invention, the raw material having a small ignition loss is at least one selected from shirasu balloon, expanded perlite, and expanded shale. By doing so, since the pores remain as closed pores in the substrate, a substrate having a low bulk specific gravity is obtained for the strength.

In a preferred aspect of the present invention, the bulk density (Db) of the green body is 1.6 to 2.1 g / cm ³ , and the relationship between the bulk density of the green body and the bending strength (Sb) is Sb>
60 × Db−60 (MPa). By doing so, the balance between weight reduction and mechanical strength is maintained at a practical level as a pottery product.

According to the present invention, there is provided a ceramic product having a ceramic body and a glaze layer formed on a required portion of the base material, wherein a step of forming the base material is performed, and glaze is applied to a necessary portion as needed. It can be manufactured by a method including a step of firing at a temperature of 1100 to 1300 ° C., and the firing shrinkage in the longitudinal direction of the substrate in the firing step is 6%.
% Or less, the amount of softening deformation of the substrate in the firing step is 10 mm or less, and the bulk density (D
b) is 1.6 to 2.1 g / cm ³ , and the relationship between the bulk density of the substrate and the bending strength (Sb) is Sb> 60 × D
b-60 (MPa) is provided. By doing so, the balance between weight reduction, mechanical strength, and design freedom is maintained at a practical level as a ceramic product.

In a preferred embodiment of the present invention, the glaze layer has a coefficient of thermal expansion of 0 to 30 × 10 ⁻⁷ more than that of the base material.
/ ° C Make the glaze smaller. By forming a glaze layer having a coefficient of thermal expansion of 0 to 30 × 10 ⁻⁷ / ° C. smaller than that of the base material on the base surface, fine cracks due to aging of the glaze surface are less likely to occur.

In a preferred embodiment of the present invention, the substrate has a coefficient of thermal expansion of 50 to 100 × 10 ⁻⁷ (/ ° C.) (50 ° C.).
６００600 ° C.). By setting the content to 100 × 10 ⁻⁷ or less, cracks are less likely to occur in the temperature lowering process during firing. Further, by setting it to 50 × 10 ⁻⁷ or more, the degree of freedom of design of the glaze layer can be ensured under conditions where defects such as cracks are unlikely to occur.

The molding method in the molding step according to the present invention includes generally used slip casting, extrusion molding,
A molding method such as press molding can be used. By doing so, it is possible to easily manufacture large-sized flat-shaped pottery products at low cost.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, main terms in the present invention will be described. In the crystalline phase present invention, a particular mineral and crystalline phase refers to a portion having a regular diffraction pattern in X-ray diffraction.
The amount of the crystal phase was quantified by an internal standard method from a calibration curve using a standard substance of each crystal phase, and expressed as a weight ratio.

[0022] In the glass phase present invention, a glass phase, refers to a portion other than the above-mentioned crystalline portion exhibiting no regular diffraction pattern Keep X-ray diffraction.

In the present invention, the ratio of the glass phase in the base is defined by the weight ratio of the glass phase to the whole base. In particular,
It is the amount excluding the amount of the crystal phase determined by X-ray diffraction.

Components of the base ceramic components include oxides and solid solutions of a plurality of metal species, such as a complex oxide crystal and a glass phase represented by mullite, and these are also determined by X-ray fluorescence analysis. It is defined in terms of weight ratio in terms of a quantified single component metal oxide.

As a result of elemental analysis by the CaO component segregation part EPMA,
A region having a high concentration is defined as a CaO component segregated portion. Ca
In the O component segregation part, based on the elemental analysis by EPMA,
It is more preferable that the Mg concentration, the Na concentration, and the K concentration are not significantly changed or are lower than those in the periphery in order to reduce firing shrinkage.

Dispersion of CaO component segregation part “ Dispersion ” refers to a state where regions are present not only in one place but in many places. In such a state, a crack deflection effect is effectively exerted.

The bulk density of the green body is measured by the Archimedes method. Width 2
After drying a test piece (baked body) having a thickness of 5 mm, a thickness of 5 mm and a length of 20 mm at 105 ° C. for 24 hours, the test piece is cooled to room temperature in an environment where the test piece does not absorb moisture, and the mass W1 is measured. Next, the test piece is kept in a vacuum for one hour to release bubbles. Further, under the same environment, the test piece is kept in water for 1 hour and then returned to room temperature. Next, the test piece is weighed while freely hanging in water with a thin thread, and the mass W2 is measured. Thereafter, this is taken out of the water, the water droplets on the surface are quickly wiped off with a squeezed compress, and the mass W3 is measured immediately. Bulk density is water density, W1, W2, W
It is obtained from the following equation from 3. Bulk density = water density × W1 / (W3-W2)

The flexural strength of the green body is measured by a three-point bending method using a fired φ13 × 130 mm test piece at a span of 100 mm and a crosshead speed of 2.5 mm / min.

Firing shrinkage rate of the base The unfired test piece having a width of 30 mm, a thickness of 15 mm, and a length of 260 mm is marked with a length of 150 mm, and a change in the length after firing divided by 150 mm is taken as a percentage of the base. The firing shrinkage was used.

Amount of Softening Deformation of the Base The unfired test piece having a width of 30 mm, a thickness of 15 mm, and a length of 260 mm is fired while being supported by a span of 200 mm, and the deflection amount at the center of the fired test piece and the thickness of the test piece are determined. Measure. Since the amount of deflection at this time is inversely proportional to the square of the thickness of the test piece, the amount of deflection converted when the thickness is 10 mm was defined as the amount of softening deformation of the substrate by the following equation. Softening deformation of the matrix = deflection amount measurement value × (thickness of test piece after baking) ^{2/10 2}

The coefficient of thermal expansion of the green body was measured using a calcined diameter of 5 m.
Using a test piece having a length of 20 mm and a length of 20 mm, the coefficient of linear thermal expansion was measured by a differential dilatometer using a compression load method or a measurement temperature range of 50 to 600 ° C.

Impact strength of the green body The impact strength of the green body was measured using a fired φ13 × 130 mm test piece with a Charpy tester.

The thermal shock resistance of the base material is 25 mm in width × 10 mm in thickness × 110 in length.
After holding the test piece of 1 mm at a predetermined temperature for 1 hour or more, the test piece was put into water and rapidly cooled, and the presence or absence of cracks was checked and evaluated. It showed the maximum temperature difference where no cracks occurred.

Next, an example of a method for producing the pottery product of the present invention will be described. As the starting material for the raw material, a clay mineral and a Ca-containing raw material are essential components, and in addition, a quartz, an alkali metal-containing raw material, and a raw material having a small ignition loss may be added. The above-mentioned raw materials are mixed and, if necessary, ground with a ball mill or the like to obtain a raw material. The average particle size of the raw material based on a laser diffraction particle size analyzer is preferably adjusted to 3 to 10 μm. When the casting method is used in the subsequent forming step, the raw material is dispersed in water and used as a suspension. In the suspension, a dispersant, a preservative, a sizing agent, an antibacterial agent and the like may be added. Kaolinite, dickite, halloysite, sericite, and pyrophyllite can be suitably used as the clay mineral. As the alkali metal-containing raw material, sericite, feldspar, and nepheline can be suitably used. Ca
Limestone and wollastonite can be suitably used as the contained material. As for the composition of each raw material, clay minerals
The content is preferably 90 parts by weight.
Preferably, it is used in the range of 5 parts by weight. Alkali-containing raw materials have a total amount of alkali oxides of 2 wt% based on the whole substrate
Can be used within a range not exceeding. When a quartz raw material is used, the content is preferably 30 parts by weight or less, and when a raw material having a small ignition loss is used, it is preferably used within a range of 5 to 50 parts by weight.

Manufacturing method The raw material is molded by a casting method or the like, removed from the mold, dried, glazed on necessary portions and fired. A plaster mold, a resin mold, or the like can be used for the casting mold, and any of pressure application, vacuum suction, mold suction, and head pressure can be used as the pressure application method. Extrusion molding, press molding and the like can also be used depending on the product size and shape. Drying can be performed, for example, at room temperature to about 110 ° C. Glaze is wet spray, dry spray,
(Other examples) can be used. Glaze, feldspar,
Natural raw materials such as quartz and limestone, amorphous raw materials such as frit glaze, and the like to which pigments and emulsifiers are added can be used. The glaze has a coefficient of thermal expansion of 0 to 30 × 10 ^-7 / ° C.
It is preferred to use small raw materials. Firing is 1100
It can be performed at a temperature of 1300 ° C. For firing, either a continuous firing furnace or a batch furnace can be used.

[0036]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the raw materials used in the examples, their chemical compositions, and the amounts of main minerals. FIG. 2 is a diagram showing the raw materials used for the base material according to the present invention, the amount of minerals contained in the raw material,
Shows characteristics and the like. The total amount of alkali oxides in the base composition is the total amount of alkali oxides such as Na ₂ O and K ₂ O in the base chemical composition, and the total amount of alkaline earth oxides is the alkaline earth oxides such as MgO and CaO. Indicates the total amount of

FIG. 2 is a graph showing the results obtained by using pottery stone, kaolin, and clay as main raw materials so that the amount of shrinkage and softening deformation during firing is reduced.
The base material of the present invention in which a sintered flux component such as a valent metal oxide is reduced, wollastonite is used, and CaO unevenly distributed portions are formed in the base material, and the base material contains about 3.8 wt% of CaO. .

The firing shrinkage, softening deformation during firing, and bending strength of the green body of the present invention are 2.8%, 5.5 mm, and 64.7.
MPa, while sufficiently suppressing the mechanical shrinkage and deformation while maintaining the mechanical strength required for ceramic products such as a draft chamber top plate and a kitchen front plate.

FIG. 3 shows the chemical composition of the glaze used in the present invention. This glaze is called Bristol Glaze and is a glaze generally used for ceramic products.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 4 is an external perspective view showing the first embodiment of the draft chamber top plate according to the present invention. FIG. 5 is an external perspective view showing a second embodiment of the kitchen front panel according to the present invention. The pottery products shown in FIG. 4 and FIG. 5 were prototyped by molding using a plaster mold by a slurry casting method, followed by finishing, drying, glaze steps, and firing. The glaze used was the one shown in FIG. The thermal expansion coefficient of the glaze is 51 × 10 ⁻⁷ / ° C.

[0041]

According to the present invention, the product shape and dimensions after firing can be accurately designed while maintaining the mechanical strength required for a pottery product, and the yield due to shrinkage and deformation is not easily reduced. In addition, it becomes possible to provide a pottery product that is more efficiently packed in a kiln and has higher productivity than before.

[Brief description of the drawings]

FIG. 1 shows the chemical composition and the amount of minerals contained in raw materials used in Examples.

FIG. 2 shows composition and physical properties of a substrate used in Examples.

FIG. 3 shows the chemical composition of the glaze used.

FIG. 4 is a schematic view of a draft chamber top plate experimentally manufactured in the embodiment.

FIG. 5 is a schematic view of a kitchen front panel produced as a prototype in the embodiment.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 33/34 C04B 33/34 41/86 41/86 RA (72) Inventor Atsushi Yoshida Kita-ku, Kitakyushu-shi, Fukuoka 2-1-1 Nakajima Totoki Kiki Co., Ltd.

Claims (17)

[Claims] 1. A ceramic product having a ceramic body and a glaze layer formed on a required portion of the body, wherein a step of forming a base material and a step of applying a glaze to a necessary portion as necessary.
It can be produced by a method including a step of firing at a temperature of 1100 to 1300 ° C., wherein the firing shrinkage in the longitudinal direction of the base in the firing step is 6% or less, and the softening deformation of the base in the firing step And the bulk density (Db) of the base is 1.6 to 2.1.
g / cm ³ , and the relationship between the bulk density of the substrate and the bending strength (Sb) is Sb> 60 × Db−60 (MPa).
Wherein the pottery product is a large plate having a plane portion represented by a draft chamber top plate, a kitchen front plate, a contaminated stone, a counter, and an operating table. 2. A ceramic product comprising a ceramic body and a glaze layer formed on a required portion of the body, wherein the body comprises a crystal phase mainly composed of mullite and quartz, SiO ₂ , Al _{The base} material contains a glass phase containing ₂ O ₃ as a main component and, if necessary, a crystal phase made of a mineral selected from cristobalite, andalusite, sillimanite, kyanite, and corundum, and the main component of the base material is SiO. ₂ 50-65wt%, Al ₂ O
₃ 30-45wt%, alkali oxide 0.1-2wt
%, A divalent metal oxide is 0.1 to 10 wt%, and at least a CaO component is contained as the divalent metal oxide component, and CaO component segregated portions in which the CaO component is segregated in the base material are scattered. The ceramic product according to claim 1, wherein the crystal phase is dispersed in the glass phase, and a composition ratio of the glass phase to the base is less than 60 wt%. 3. Ca and N in the CaO component segregation part.
The relation of the abundance ratio (weight ratio) of a, K, and Mg is Ca> N.
The ceramic product according to claim 1, wherein the relationship satisfies all of a, Ca> K, and Ca> Mg. 4. The pottery product according to claim 1, wherein the amount of the CaO component in the substrate is 1 wt% or more. 5. The relationship between the CaO component and the other divalent metal oxide component in the substrate is such that the other divalent metal oxide is 50 parts by weight or less based on 100 parts by weight of CaO. The pottery product according to claim 1. 6. An alkaline oxide component 1 in the substrate.
The pottery product according to any one of claims 1 to 5, wherein the divalent metal oxide component is present in an amount of 100% by weight or more based on 00 parts by weight. 7. The porcelain product according to claim 1, wherein the amount of quartz in the base material is 20 wt% or less. 8. The pottery product according to claim 1, wherein when the base contains corundum, the amount of corundum is 20 wt% or less. 9. A pottery product which can be produced by a method including a step of forming a base material, a step of glazing a necessary portion as necessary, and a step of firing at a temperature of 1100 to 1300 ° C. Contains a clay mineral, quartz, a raw material containing an alkali metal and a raw material containing a divalent metal, and the clay mineral contains at least one selected from kaolinite, dickite, halloysite, sericite, and pyrophyllite. Wherein at least wollastonite, limestone or anorthite is contained as the divalent metal-containing raw material, the amount of the quartz is 30 wt% or less based on the raw material, and the amount of the clay mineral is 30-90w for raw material
The base material has a particle size adjusted to have an average particle size of 3 to 10 μm based on a laser diffraction particle size analyzer, and the pottery product is a draft chamber top plate, a kitchen front plate, a contaminated stone. A pottery product characterized by being a large plate having a flat portion represented by a table, a counter and an operating table. 10. A pottery product that can be produced by a method including a step of forming a base material, a step of glazing a necessary portion as necessary, and a step of firing at a temperature of 1100 to 1300 ° C. Contains a clay mineral, quartz, a raw material containing an alkali metal oxide, a raw material containing a divalent metal oxide, and a raw material having a small loss on ignition. The clay mineral is kaolinite, dickite, halloysite, sericite, pyrophyllite. A mineral containing at least one selected from light; the amount of quartz is 30 wt% or less based on the base material; the clay mineral is 30 to 90 wt% based on the base material; Small raw material is 5 to 50 w
The base material has a particle size adjusted to have an average particle size of 3 to 10 μm based on a laser diffraction particle size analyzer, and the pottery product is a draft chamber top plate, a kitchen front plate, a contaminated stone. A pottery product characterized by being a large plate having a flat portion represented by a table, a counter and an operating table. 11. The porcelain product according to claim 10, wherein the divalent metal-containing raw material contains at least wollastonite, limestone, or feldspar. 12. The raw material having a small ignition loss is chamotte, and the main mineral of the chamotte is at least one mineral selected from mullite, cristobalite, quartz, and corundum, and the amount of CaO in the chamotte is The pottery product according to claim 10, wherein the content is 1 wt% or more. 13. The raw material having a small ignition loss is SiO 2
_2. The ceramic product according to claim 10, wherein the product is a hollow glass containing Al ₂ O ₃ as a main component. 14. The porcelain product according to claim 10, wherein the raw material having a small loss on ignition is at least one selected from shirasu balloon, expanded perlite, and expanded shale. 15. The ceramic product according to claim 1, wherein the glaze layer is a glaze having a coefficient of thermal expansion smaller by 0 to 30 × 10 ⁻⁷ / ° C. than that of the base material. 16. The substrate has a coefficient of thermal expansion of 50 to 100.
The pottery product according to any one of claims 1 to 15, wherein the temperature is × 10 ^-7 (/ ° C) (50 to 600 ° C). 17. The impact strength of the substrate is 2 × 10 ⁻¹ J /
The pottery product according to any one of claims 1 to 16, wherein the size is not less than cm ² .