Manufacturing method of non-cohesive-gel ceramic knife

Abstract

The invention discloses a manufacturing method of a non-cohesive gel ceramic knife, which comprises the following steps: 1) preparing slurry, namely putting nanoscale yttrium-stabilized zirconia powder, a dispersing agent, an adhesive, a plasticizer and a solvent into a ball-milling tank for mixing and ball-milling to prepare the slurry; 2) tape casting: carrying out tape casting on the slurry to prepare a raw membrane; (3) isostatic pressing treatment: covering the upper surface and the lower surface of the raw diaphragm with release paper with the surface roughness Ra of 3-5 microns, putting the raw diaphragm into a sealing bag for vacuumizing treatment, then carrying out isostatic pressing treatment to form the roughness of the release paper on the surface of the raw diaphragm, and separating the sealing bag and the release paper from the raw diaphragm after isostatic pressing treatment; (4) pre-cutting: cutting the raw diaphragm subjected to isostatic pressing treatment into a blade shape; 5) degumming: feeding into a degreasing furnace for degumming; 6) sintering: sintering in a sintering furnace; and (7) edging is conducted, specifically, a rough grinding wheel is used for edging, and a rough edge face and a sawtooth-shaped cutting edge are formed. The manufactured ceramic cutting tool is good in anti-sticking effect, compact and uniform in blade and high in strength.

Description

Technical Field

[0001] The present invention generally relates to the field of ceramic knives. Background Art

[0002] When cutting sticky materials like tape, existing ceramic knives are susceptible to adhesive sticking to their cutting edges, reducing cutting efficiency and making them difficult to clean. Traditional non-stick ceramic knives (such as those with porous structures or raised dot designs) are primarily designed to prevent food from sticking. However, these pores or raised dots can easily be filled with sticky materials like tape, rendering them ineffective. Traditional ceramic knives rely on dry pressing or injection molding in manufacturing, which can lead to uneven density and high defect rates. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a method for manufacturing a non-stick ceramic knife with good anti-stick effect, dense and uniform blades and high strength is provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for manufacturing a non-stick ceramic knife, characterized by comprising the following steps:

[0006] 1) Slurry preparation: nano-scale yttrium-stabilized zirconia powder, dispersant, binder, plasticizer, and solvent are placed in a ball mill and mixed and ball-milled to form a slurry;

[0007] 2) Tape casting, the slurry is tape-cast to form a green film sheet;

[0008] 3) Isostatic pressing: Cover the upper and lower surfaces of the green film with release paper having a surface roughness of Ra = 3-5 μm, place it in a sealed bag, evacuate it, and then perform isostatic pressing to form the roughness of the release paper on the surface of the green film. After the isostatic pressing, separate the sealing bag and release paper from the green film.

[0009] 4) Pre-cutting: cutting the green film after isostatic pressing into blade shapes;

[0010] 5) Degumming, sending to degreasing furnace for degumming;

[0011] 6) Sintering, sending into a sintering furnace for sintering;

[0012] 7) Sharpening: Use a coarse grinding wheel to sharpen the blade to form a rough blade surface and a serrated edge.

[0013] As a further improvement of the present invention, the nano-scale yttrium-stabilized zirconia powder has a particle size of 0.3-0.5 μm and contains 95-98% zirconium oxide and 2-5% yttrium oxide by mass.

[0014] As a further improvement of the present invention, the mass ratio of the powder to the additives is: 65%-75% nano-grade yttrium-stabilized zirconia powder, 0.5-1.0% dispersant, 7-14% binder, 1-2% plasticizer, and 15-20% solvent. By adjusting the amount of solvent added, the viscosity of the slurry prepared after ball milling is 500-1000 mPa·s.

[0015] As a further improvement of the present invention, in the slurry preparation step, wet ball milling is adopted, the ball-to-material ratio is 3:1, the diameter of the zirconia balls is Φ6 mm, and the ball milling time is 12-24 h.

[0016] As a further improvement of the present invention, the pressing pressure of the isostatic pressing treatment is set to 150 MPa±10 MPa, and the holding time is 2-10 min.

[0017] As a further improvement of the present invention, in the degumming step, the temperature of the degreasing furnace is set to 550° C.±10° C. and kept warm for 2-4 hours.

[0018] As a further improvement of the present invention, in the sintering step, the temperature of the sintering furnace is set to 1350° C.±10° C. and kept warm for 2-4 hours.

[0019] As a further improvement of the present invention, in the sharpening step, a 100-300 mesh diamond resin grinding wheel is used for sharpening.

[0020] Compared with existing technologies, the present invention offers the following advantages: It utilizes tape casting combined with isostatic pressing using rough release paper to enhance the blade's surface roughness, significantly reducing the contact area between the blade and the tape when cutting, thus preventing adhesive adhesion. The use of a coarse grinding wheel for sharpening creates a roughened blade surface and serrated edge, further disrupting the continuous adhesion of adhesives and providing a double guarantee of adhesive resistance. Furthermore, the ceramic blades produced using tape casting combined with isostatic pressing are dense, uniform, and highly strong. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below through specific embodiments. It should be noted that the protection scope of the present invention is not limited to the following embodiments. Any improvements and modifications made to the present invention without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

[0022] The manufacturing method of the non-stick ceramic knife of the present invention comprises the following steps:

[0023] 1) Slurry preparation: Nano-sized yttrium-stabilized zirconia powder, a dispersant (preferably polyammonium acrylate), a binder (preferably PVA), a plasticizer (preferably PEG400), and a solvent (preferably water) are placed in a ball mill and mixed and ball-milled to form a slurry. The nano-sized yttrium-stabilized zirconia powder has a particle size of 0.3-0.5 μm and contains 95-98% zirconium oxide and 2-5% yttrium oxide by weight. The mass ratio of powder to additives is preferably: 65%-75% nano-sized yttrium-stabilized zirconia powder, 0.5-1.0% dispersant, 7-14% binder, 1-2% plasticizer, and 15-20% solvent. The amount of solvent added is adjusted to achieve a slurry viscosity of 500-1000 mPa·s after ball milling. Wet milling is performed with a ball-to-material ratio of 3:1, zirconia balls with a diameter of Φ6 mm, and a milling time of 12-24 hours. As one preferred embodiment, a powder with a particle size of 0.4 μm can be selected, comprising 97% zirconium oxide and 3% yttrium oxide. The mass ratio of the powder and additives is: 70% nano-scale yttrium-stabilized zirconium oxide powder, 0.5% dispersant, 10% binder, 1.5% plasticizer, and 18% solvent.

[0024] 2) Tape casting: The slurry is tape-casted to form a green film sheet. An automatic tape casting machine (with adjustable blade gap, accuracy ±0.002mm) is used. The parameters are as follows: blade gap: 0.5-2.5mm (controls green body thickness), casting speed: 0.5-3m / min, and drying conditions: hot air circulating drying oven, temperature 80°C ± 5°C, drying time 10-30 minutes (humidity ≤ 30%), to obtain a green film sheet with a thickness of 0.5mm.

[0025] 3) Isostatic pressing: Cover the upper and lower surfaces of the raw film with release paper with a surface roughness of Ra = 3-5μm, place it in a sealed bag for vacuum treatment, and then perform isostatic pressing to make the surface of the raw film form the roughness of the release paper. After isostatic pressing, separate the sealing bag and release paper from the raw film. Isostatic pressing improves the surface roughness of the raw film and enhances the uniformity of the density of the raw film. The isostatic pressing equipment uses a cold isostatic press (pressure range 50-300MPa), set the pressing pressure to 150MPa±10MPa, and the pressure holding time is: 2-10min.

[0026] 4) Pre-cutting: Cut the isostatically pressed green film into blade shapes using a laser cutter (150W, CO2) with a cutting speed of 30-50 mm / s and a cutting power of 60%-70%.

[0027] 5) Degumming: Send the product to the degreasing furnace for degumming. Set the degreasing furnace temperature to 550℃±10℃ and keep it warm for 2-4 hours.

[0028] 6) Sintering: Send the product to a sintering furnace for sintering. The sintering furnace uses a high-temperature box furnace, the temperature is set to 1350℃±10℃, and the temperature is kept for 2-4 hours.

[0029] 7) Sharpening: Use a coarse grinding wheel to create a rough, serrated edge. Use a 100-300 mesh diamond resinoid grinding wheel, set the wheel speed to 1000-2500 rpm, the feed rate to 0.005-0.05 mm / rev, and the blade angle to 15° ± 5°. By optimizing the blade angle, a balance between adhesive resistance and sharpness is achieved.

Claims

1. A method for manufacturing a non-stick ceramic knife, characterized in that The following steps are involved: 1) Slurry preparation: nano-scale yttrium-stabilized zirconia powder, dispersant, binder, plasticizer, and solvent are placed in a ball mill and mixed and ball-milled to form a slurry; 2) Tape casting, the slurry is tape-cast to form a green film sheet; 3) Isostatic pressing: Cover the upper and lower surfaces of the green film with release paper having a surface roughness of Ra = 3-5 μm, place it in a sealed bag, evacuate it, and then perform isostatic pressing to form the roughness of the release paper on the surface of the green film. After the isostatic pressing, separate the sealing bag and release paper from the green film. 4) Pre-cutting: cutting the green film after isostatic pressing into blade shapes; 5) Degumming, sending to degreasing furnace for degumming; 6) Sintering, sending into a sintering furnace for sintering; 7) Sharpening: Use a coarse grinding wheel to sharpen the blade to form a rough blade surface and a serrated edge.

2. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: The nano-scale yttrium-stabilized zirconia powder has a particle size of 0.3-0.5 μm and contains 95-98% by mass of zirconium oxide and 2-5% by mass of yttrium oxide.

3. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: The mass ratio of the powder to the additives is: 65%-75% of nano-grade yttrium-stabilized zirconia powder, 0.5-1.0% of dispersant, 7-14% of binder, 1-2% of plasticizer, and 15-20% of solvent. The viscosity of the slurry prepared after ball milling is adjusted to 500-1000 mPa·s by adjusting the amount of solvent added.

4. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: In the slurry preparation step, wet ball milling is adopted, the ball-to-material ratio is 3:1, the diameter of the zirconia ball is Φ6 mm, and the ball milling time is 12-24 h.

5. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: The pressing pressure of the isostatic pressing treatment is set to 150MPa±10MPa, and the holding time is 2-10min.

6. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: During the degumming step, the degreasing furnace temperature is set to 550°C ± 10°C and kept warm for 2-4 hours.

7. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: During the sintering step, the sintering furnace temperature is set to 1350°C ± 10°C and kept at this temperature for 2-4 hours.

8. The method for manufacturing a non-stick ceramic knife according to claim 1, characterized in that: In the sharpening step, a 100-300 mesh diamond resin grinding wheel is used for sharpening.