Composite ceramic and forming process thereof

Abstract

The invention provides a composite ceramic, which can effectively reduce the fragility of the ceramic and improve the yield of the ceramic, and is characterized by comprising the following materials in percentage by weight: 80-90% of a base material and 10-20% of a binder, and the binder comprises an EVA (Ethylene Vinyl Acetate) material. The invention also provides a forming process of the composite ceramic.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic production, in particular to a composite ceramic and a molding process thereof. Background Art

[0002] Ceramic materials refer to a type of inorganic non-metallic material made from natural or synthetic compounds through forming and high-temperature sintering. It has the advantages of high melting point, high hardness, high wear resistance, and oxidation resistance. It can be used as a structural material and tool material. Since ceramics also have some special properties, they can also be used as functional materials. However, the existing ceramic material manufacturing process is relatively complicated, and due to the fragility of ceramics, the ceramic yield is low. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a composite ceramic, which effectively reduces the fragility of the ceramic and improves the yield of the ceramic. The present invention also provides a molding process for the composite ceramic.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions: A composite ceramic, characterized in that it is composed of the following materials: 80-90% (weight percentage) of a base material and 10-20% (weight percentage) of a binder, wherein the binder is an EVA material.

[0005] It is further characterized in that: the base material is one or more mixtures of ZrO2, magnesium oxide, and calcium oxide, which are crushed and mixed; A composite ceramic and a forming process thereof, characterized in that it comprises the following steps: Step 1: crushing the base material, pouring the base material into a crusher for crushing, sieving the material, and obtaining material powder; Step 2: Add the base material and PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature, heat to 60-100°C, and evaporate the water; Step 3: Add EVA and stir to form a hot-soluble slurry; Step 4: hot-pressing the hot-melt slurry formed in step 3 into a mold to form a product blank; Step 5: Soak the product blank in water to remove PEG; Step six: debinding and sintering the product obtained in step five to form a ceramic blank.

[0006] Furthermore, the sintering temperature in step six is ​​controlled to be 1350°C to 1400°C.

[0007] Furthermore, the ratio of the weight of clean water added in step three to the weight of the mixture is 1:2.

[0008] Furthermore, the PEG and the EVA are binders, and the proportion of the PEG to the EVA is 80-90% (weight percentage) of the EVA and the PEG is 10-20% (weight percentage) of the EVA. The base material and the binder account for 80-90% (weight percentage) of the base material and 10-20% (weight percentage) of the binder; In the above components of the present invention, 10-20% (weight percentage) of the binder is used, and the binder is EVA material. Due to the high water resistance and toughness of the EVA material, the fragility of the ceramic is effectively reduced and the yield of the ceramic is improved. DETAILED DESCRIPTION

[0009] A composite ceramic is composed of the following materials: 80-90% (weight percentage) of a base material and 10-20% (weight percentage) of a binder, wherein the binder is an EVA material. The binder is an EVA material. Due to the high water resistance and toughness of the EVA material, the fragility of the ceramic is effectively reduced and the yield of the ceramic is improved.

[0010] The base material is composed of one or more materials of monoclinic ZrO2 which are crushed and mixed to form one or more mixtures.

[0011] Embodiment 1: A composite ceramic forming process comprises the following steps: (1) Grinding the base material: pour the base material, magnesium stearate and calcium stearate into a grinder, grind them, and sieve the materials to obtain powder; (2) Add 80% (weight percentage) of the base material and 2% (weight percentage) of PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature and heat it to 60-100°C to evaporate the water; (3) Add 18% EVA (by weight) and stir to form a hot-soluble slurry; (4) hot pressing the hot-melt slurry formed in (3) into a product blank in a mold; (5) Soak the product blank in water to remove PEG; (6) The product obtained in (5) is subjected to binder removal sintering at 1000°C and sintering at 1350°C to form a ceramic blank.

[0012] Embodiment 2: A composite ceramic forming process comprises the following steps: (1) Grinding the base material: pour the base material, magnesium stearate and calcium stearate into a grinder, grind them, and sieve the materials to obtain powder; (2) Add 85% (weight percentage) of the base material and 3% (weight percentage) of PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature and heat it to 60-100°C to evaporate the water; (3) Add 17% EVA (by weight) and stir to form a hot-soluble slurry; (4) hot pressing the mixture formed in step (3) in a mold to form a product blank; (5) Soak the product blank in water to remove PEG; (6) The product obtained in step (5) is subjected to binder removal sintering at 1100° C. and sintering at 1360° C. to form a ceramic blank.

[0013] Embodiment three: A composite ceramic forming process comprises the following steps: (1) Grinding the base material: pouring the base material into a grinder, grinding it, sieving it, and obtaining powder; (2) Add 90% (weight percentage) of the base material and 1% (weight percentage) of PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature and heat it to 60-100°C to evaporate the water; (3) Add 9% EVA (by weight) and stir to form a hot-soluble slurry; (4) hot pressing the mixture formed in step (3) in a mold to form a product blank; (5) Soak the product blank in water to remove PEG; (6) The product obtained in step (5) is subjected to binder removal sintering at 1200° C. and sintered at 1370° C. to form a ceramic blank.

[0014] Embodiment 4: A composite ceramic forming process comprises the following steps: (1) Grinding the base material: pouring the base material into a grinder, grinding it, sieving it, and obtaining powder; (2) Add 85% (weight percentage) of the base material and 1.5% (weight percentage) of PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature and heat it to 60-100°C to evaporate the water; (3) Add 8.5% EVA (by weight) and stir to form a hot-soluble slurry; (4) hot pressing the mixture formed in step (3) in a mold to form a product blank; (5) Soak the product blank in water to remove PEG; (6) The product obtained in step (5) is subjected to binder removal sintering at 1100° C. and sintering at 1380° C. to form a ceramic blank.

[0015] Embodiment five: A composite ceramic and a forming process thereof, comprising the following steps: (1) Grinding the base material: pour the base material, magnesium stearate and calcium stearate into a grinder, grind them, and sieve the materials to obtain powder; (2) Add 80% (weight percentage) of the base material and 4% (weight percentage) of PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature and heat it to 60-100°C to evaporate the water; (3) Add 16% EVA (by weight) and stir to form a hot-soluble slurry; (4) hot pressing the mixture formed in step (3) in a mold to form a product blank; (5) Soak the product blank in water to remove PEG; (6) The product obtained in step (5) is subjected to binder removal sintering at 1100° C. and sintered at 1400° C. to form a ceramic blank.

[0016] In the above embodiment: PEG is soluble in water. After adding water and kneading, PEG and the ceramic powder base can be fully dispersed. Then the water is removed, and the magnesium oxide, calcium oxide and zirconium oxide are fully mixed, so that PEG is evenly wrapped on the surface of the ceramic powder base, the fluidity of the slurry is increased, the product is more evenly dispersed, and the product density and fracture toughness are increased.

Claims

1. A composite ceramic, characterized in that: The invention is composed of the following materials: 80-90% (weight percentage) of a base material and 10-20% (weight percentage) of a binder, wherein the binder comprises an EVA material.

2. A composite ceramic material according to claim 1, characterized in that: The base material is one or more mixtures of monoclinic ZrO2, magnesium oxide and calcium oxide which are crushed and mixed.

3. A composite ceramic material according to claim 1, characterized in that: The binder is composed of one or more substances of magnesium stearate, calcium stearate, EVA and PEG, which are crushed and mixed.

4. A composite ceramic forming process, characterized in that: It includes the following steps: Step 1: Grinding the base material: magnesium stearate and calcium stearate. Pour the base material into a grinder, grind it, and sieve the material to obtain powder; Step 2: Add the base material and PEG into a kneader, add water and knead into a mud material, turn on the kneader temperature, heat to 60-100°C, and evaporate the water; Step 3: Add EVA and stir to form a hot-soluble slurry; Step 4: hot-pressing the hot-melt slurry formed in step 3 into a mold to form a product blank; Step 5: Soak the product blank in water to remove PEG; Step six: debinding and sintering the product obtained in step five to form a ceramic blank.

5. A composite ceramic forming process according to claim 4, characterized in that: The PEG and the EVA are binders, and the proportion of the PEG to the EVA is 80-90% (weight percentage) of the EVA and the PEG accounts for 10-20% of the EVA (weight percentage); The proportion of the base material to the binder is: the base material accounts for 80-90% (weight percentage) and the binder accounts for 10-20% (weight percentage).

6. A composite ceramic forming process according to claim 5, characterized in that: The sintering temperature in step six is ​​controlled to be 1350°C to 1400°C.

7. A composite ceramic forming process according to claim 5, characterized in that: Furthermore, the ratio of the weight of clean water added in step three to the weight of the mixture is 1:2.