CN108456006A - The recyclability restorative procedure of Nixing pottery hallrcuts - Google Patents

Abstract

The present invention provides the recyclability restorative procedures of Nixing pottery hallrcuts, include the following steps：1) by flyash and SmCl₃Grinding, adds water to stir evenly, obtains mixed serum；2) mixed serum is dipped with brush uniformly to smear at Nixing pottery green body slight crack until complete wetting, spontaneously dries；Continue to dip at mixed serum smearing slight crack until complete wetting, natural drying so repeat, until the crack of dry base substrate is filled；3) green body is smoothed out, 15~30min, natural cooling are fired at 1000~1100 DEG C.The present invention at powerful mullite network structure and slight crack by carrying out cross-fixing, to play the role of repairing slight crack, thin but also more mullite network structure intensity is larger not only, can hinder the sliding of crystal boundary, the extension that can prevent crackle, to effectively prevent secondary cracking.

Description

Renewable repair method for microcracks in Nixing pottery

technical field

The invention relates to a manufacturing process of Nixing pottery, in particular to a reproducible repair method for microcracks in Nixing pottery.

Background technique

The process of Nixing pottery mainly includes the following steps: 1) Preparation of blank: the blank is selected from the soil east of the Qinjiang River across the urban area of Qinzhou City, commonly known as Dongni (soft clay, yellow-white in color, containing a small amount of quartz sand) , which plays the role of adjusting plasticity and combination in the production process of Nixing pottery), and the soil in the area west of the Qinjiang River, commonly known as Ximu (contains a small amount of K ₂ O, NaO, CaO, MgO, Fe ₂ 0 ₃ , TiO ₂ , MnO ₂ is a kind of purple mudstone with high iron content, the color is purple red, the surface layer has a small amount of iron dissemination, it is hard clay, and the plasticity and bonding are poor), according to Dongni 40-60%, Mix 40-60% of Xini by weight, and make blanks through a series of processes such as grinding and dehydration; the moisture content of the blanks is 24-25%; Various types of blanks; 3) trimming the blanks: trimming the blanks to meet the design requirements; 4) drying: using the air-drying method to dry the blanks to remove moisture from the blanks; 6) Dry the green body; 7) Firing the green body: put the dried green body in a kiln to fire, the firing temperature is controlled at 1100-1200°C, the firing time is 10 hours, and it is released after cooling. kiln; 8) Polishing and polishing: polishing and polishing the green body to obtain.

The defect of Nixing pottery is its high brittleness. Nixing pottery has a polycrystalline structure composed of ionic bonds or covalent bonds. The atoms of these chemical bonds are not as tightly arranged as metal bonds, and there are many pores that are difficult to cause dislocation movement. Covalent bonds are directional, which makes the crystal structure complex, and has a high ability to resist distortion and hinder displacement movement, and lacks a slip system that can promote material deformation. Once Nixing pottery is subjected to an external load, coupled with the existence of micro-defects formed on the surface of the material that are difficult to avoid in ceramic technology, they all constitute crack sources, and stress will concentrate at the tips of these cracks. Does Nixingtao have any other system that can consume external energy, only to exchange it with new free energy. The so-called new free energy is the energy absorbed by the new surface formed by the extension of the crack tip. The result of this is the rapid propagation of cracks that manifest as so-called brittle fractures.

Contents of the invention

The technical problem to be solved by the present invention is to provide a reproducible method for repairing the microcracks of Nixing pottery. This process completely repairs the cracks of the green body and can effectively prevent secondary cracks after firing.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is a reproducible repair method for Nixing pottery micro-cracks, comprising the following steps:

1) Grinding the fly ash and _SmCl3 , adding water and stirring evenly to obtain a mixed slurry;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1000-1100°C for 15-30 minutes, and cool naturally.

Al ₂ O ₃ , Fe ₂ O ₃ , and MgO in fly ash are eutectic oxides, which can form a liquid phase at 1000-1100 ° C, which promotes the synthesis of mullite. The presence of Cl ^- can reduce the liquid phase. Viscosity, the atoms in the liquid phase are easier to diffuse. Under this condition, the initial stage of mullite precipitation has a high nucleation rate, and the easy atomic diffusion accelerates the growth of rod-shaped grains, so more mullite rods are formed. grain. Sm ³⁺ can refine the rod-shaped mullite grain size, the particles are closely connected, and the effective migration area and contact area between particles are increased. These many and fine mullite rod-shaped grains form a huge network structure and penetrate into the Deep in the crack, it forms a cross network with the crack, thus playing the role of repairing the crack. And because the fine and numerous mullite network structure is strong, it can hinder the slippage of the grain boundary, prevent the expansion of cracks, and thus effectively prevent secondary cracking.

Although the rare earth oxide can also play a role in refining the grains, it cannot increase the number of grains. The grains are fine but few, and cannot play a good repair effect, and it is very easy to cause secondary cracking.

The eutectic oxide in fly ash fills the gaps between the rod-shaped mullite grains during the sintering and cooling stage to play a bonding role, avoiding the loose structure caused by the growth of mullite, and further improving the Repair effect.

The water content of the mixed slurry is 30-50%.

Grind the fly ash to 200-400 mesh.

The weight of SmCl ₃ is 0.01-0.05% of the fly ash.

Fire at 1000-1050°C for 15-20 minutes.

Compared with the prior art, the present invention cross-fixes the cracks through the strong mullite network structure, thereby repairing the cracks, and the thin and numerous mullite network structure has a higher strength, which can hinder the grain boundary The slippage can prevent the expansion of cracks, thus effectively preventing secondary cracking.

Detailed ways

The following examples are used to further illustrate the substantive content of the present invention, but the present invention is not limited thereto.

The Nixing pottery bodies used in the following experiments are all Nixing pottery vessels made in the same batch with the same size, the same process, and the same formula. mm).

Example 1

1) Grind fly ash and _SmCl3 to 200 mesh, add water and stir evenly to obtain a mixed slurry with a water content of 30%; the weight of _SmCl3 is 0.01% of fly ash;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1000°C for 15 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 104MPa.

Comparative example 1

1) Grind the fly ash and _Sm2O3 to 200 mesh, _add water and _stir evenly to obtain a mixed slurry with a water content of 30%; the weight of _Sm2O3 is 0.01% of the flyash;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1000°C for 15 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 49MPa.

Comparative example 2

1) Grinding the fly ash to 200 mesh, adding water and stirring evenly to obtain a mixed slurry with a moisture content of 30%;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1000°C for 15 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 31MPa.

Comparative example 3

1) Use a brush to dip the Nixing pottery blank slurry (moisture content is 30%) and evenly apply it to the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the slurry and apply the slurry until it is completely wet, and then dry naturally Repeat this until the cracks in the dry body are filled;

3) Smooth the green body, fire at 1000°C for 15 minutes, and cool naturally.

The flexural strength test is carried out on the crack repair part, and its strength is 15MPa.

Example 2

1) Grind fly ash and _SmCl3 to 400 mesh, add water and stir evenly to obtain a mixed slurry with a water content of 50%; the weight of _SmCl3 is 0.05% of fly ash;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1100°C for 30 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 99MPa.

Example 3

1) Grind fly ash and _SmCl3 to 300 mesh, add water and stir evenly to obtain a mixed slurry with a water content of 40%; the weight of _SmCl3 is 0.03% of fly ash;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1020°C for 18 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 110MPa.

Example 4

1) Grind fly ash and _SmCl3 to 2000 mesh, add water and stir evenly to obtain a mixed slurry with a water content of 50%; the weight of _SmCl3 is 0.01% of fly ash;

2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled;

3) Smooth the green body, fire at 1100°C for 15 minutes, and cool naturally.

The flexural strength test was carried out on the crack repaired part, and its strength was 96MPa.

Claims (5)

1. The regenerative repairing method of Nixing pottery microcrack, is characterized in that: comprise the following steps: 1) Grinding the fly ash and _SmCl3 , adding water and stirring evenly to obtain a mixed slurry; 2) Use a brush to dip the mixed slurry and evenly apply the cracks of the Nixing pottery body until it is completely wet, and then dry naturally; continue to dip the mixed slurry to apply the cracks until it is completely wet, and then dry naturally, and repeat until the cracks of the green body are dry until it is filled; 3) Smooth the green body, fire at 1000-1100°C for 15-30 minutes, and cool naturally. 2. The reproducible method for repairing microcracks in Nixing pottery according to claim 1, characterized in that the water content of the mixed slurry is 30-50%. 3. The reproducible repair method for microcracks in Nixing pottery according to claim 1, characterized in that: the fly ash is ground to 200-400 mesh. 4. The reproducible method for repairing microcracks in Nixing pottery according to claim 1, characterized in that: the weight of _SmCl3 is 0.01-0.05% of the fly ash. 5. The reproducible method for repairing microcracks in Nixing pottery according to claim 4, characterized in that: firing at 1000-1050° C. for 15-20 minutes.