阅读说明：本技术 一种氧化铝陶瓷件的粉料及制备方法 (Powder of alumina ceramic part and preparation method thereof ) 是由 高勇 赵小玻 王玉宝 徐先豹 崔凯 魏华阳 鲍晓芸 张永翠 于 2018-05-29 设计创作，主要内容包括：本发明公开了一种氧化铝陶瓷件的粉料及制备方法,所述粉料由以下重量分数的原料组成70wt％～95wt％Al<Sub>2</Sub>O<Sub>3</Sub>、0wt％～15wt％苏州土、0wt％～8wt％烧滑石、1wt％～8wt％方解石、1wt％～10wt％硅酸锆、0wt％～5wt％锂辉石,其中,所述苏州土和烧滑石不同时取0。本发明要求保护的氧化铝陶瓷材料的粉料制造的产品,同一批次及不同批次烧结后产品的尺寸波动值均小于百分之一。(The invention discloses a powder material of an alumina ceramic part and a preparation method thereof, wherein the powder material comprises the following raw materials, by weight, 70-95% of Al2O3, 0-15% of Suzhou soil, 0-8% of calcined talc, 1-8% of calcite, 1-10% of zirconium silicate and 0-5% of spodumene, wherein the Suzhou soil and the calcined talc are not 0 at the same time. The size fluctuation value of the products made of the alumina ceramic material powder claimed by the invention is less than one percent after sintering in the same batch and different batches.)

1. The powder of the alumina ceramic material is characterized in that: the aluminum alloy material is prepared from the following raw materials, by weight, 70-95% of Al2O3, 0-15% of Suzhou soil, 0-8% of burnt talc, 1-8% of calcite, 1-10% of zirconium silicate and 0-5% of spodumene, wherein the Suzhou soil and the burnt talc are not 0 at the same time.

2. A preparation method of an alumina ceramic part is characterized by comprising the following steps: the method comprises the following steps:

(1) Ball milling a powder of the alumina ceramic material of claim 1;

(2) Drying the ball-milled powder, putting the powder into a mixing roll, adding an organic binder with the powder mass fraction of 10-20%, and uniformly mixing at a certain temperature;

(3) Granulating the mixed raw materials, feeding the granulated raw materials into a hopper of a high-pressure injection molding machine, applying high temperature and high pressure to inject the granulated raw materials into a precise mold, and opening the mold to obtain a ceramic blank;

(4) degreasing the ceramic blank;

(5) and drying the degreased ceramic blank, performing glue removal treatment, and heating for sintering.

3. The method for producing an alumina ceramic article according to claim 2, wherein: and (2) putting the powder into a ball mill for ball milling in the step (1), wherein the ball mill is a horizontal ceramic ball mill, a stirring mill, a sand mill, a V-shaped mixer or an air flow mill.

4. The method for producing an alumina ceramic article according to claim 2, wherein: the ball milling time is 1-18 hours.

5. The method for producing an alumina ceramic article according to claim 2, wherein: the organic binder in the step (2) is a multi-component wax-based system and consists of 50 to 75 weight percent of paraffin, 10 to 30 weight percent of high-density polyethylene and 3 to 15 weight percent of stearic acid.

6. The method for producing an alumina ceramic article according to claim 5, wherein: the preparation method of the organic binder comprises the steps of adding all the components into a mixing machine for melting and stirring, fully and uniformly mixing, and cooling for later use.

7. The method for producing an alumina ceramic article according to claim 2, wherein: the injection pressure in the step (3) is 20-50 MPa, and the injection temperature is 120-180 ℃.

8. The method for producing an alumina ceramic article according to claim 2, wherein: the degreasing solvent in the step (4) is dichloromethane, trichloromethane or environment-friendly oil.

9. The method for producing an alumina ceramic article according to claim 2, wherein: the step (5) is specifically as follows: drying the degreased ceramic blank, then preserving heat at 650 ℃ for 2 hours for glue removal treatment, wherein the heating rate is 20 ℃/h, then heating to 1470-1550 ℃ for sintering, the heating rate is 120-180 ℃/h, and the heat preservation time is 2-16 hours.

10. An alumina ceramic article produced by the method for producing an alumina ceramic article according to any one of claims 2 to 9.

Technical Field

the invention relates to the technical field of ceramic material preparation, in particular to powder of an alumina ceramic part and a preparation method thereof.

background

because of a series of advantages of high hardness, high strength, high temperature resistance, corrosion resistance and the like, the alumina ceramic can play an important role in various extreme environments, is incomparable with organic polymer materials and metal materials, has been developed into various fields of industrial and agricultural production, national economy, science and technology, has been rapidly developed in recent decades, such as space technology, energy technology, biomedical technology and the like, is increasingly applied to the alumina ceramic, and has been continuously widened in application field. However, the characteristics of low production yield and poor dimensional accuracy controllability of alumina ceramic parts greatly limit the large-scale application of the alumina ceramic parts, particularly, the alumina ceramic parts with complex shapes are more difficult to produce in batches, the required accuracy is difficult to effectively control in the ceramic production process, the dimensional accuracy of structural parts can only be realized by means of machining, and the alumina ceramic has high hardness and high brittleness, and complex structures such as thin-wall and curved-surface structures are extremely difficult to machine, so that the cost is high, and the capacity is severely limited. In the industry, the qualification rate of the alumina ceramic part with the complex shape is less than 20 percent, and the main reason is from the characteristic of poor controllability of ceramic forming and sintering processes.

The blank of the alumina ceramic part with a complex shape formed by the currently and generally adopted dry pressing and isostatic pressing processes has poor dimensional accuracy, and a large dimensional allowance needs to be reserved for machining; the existing injection molding process is also difficult to produce alumina ceramic parts in batches, and the main reasons are that the content of alumina feeding organic matters is high, and the organic matters are difficult to completely eliminate in the sintering process, so that the injection-molded alumina ceramic parts have many pore defects and low density, and the product performance cannot meet the requirements; the shrinkage and consistency of the ceramic piece caused by large shrinkage of the sintering size are uncontrollable, and the difficulty which cannot be overcome by the existing alumina ceramic system is overcome. The defect is caused in an alumina ceramic system 'a tire', the sintering shrinkage of the existing alumina ceramic system is up to 20%, the size change temperature zone is narrow, the size of an alumina ceramic part is not changed only in the sintering temperature zone of 10-20 ℃, the fluctuation of the sintering temperature obviously has great influence on the size shrinkage and deformation of the alumina ceramic part, and the industrialization process of the alumina ceramic part is directly restricted. Therefore, the alumina ceramic system needs to be adjusted from the source, so that the dimensional precision of the alumina ceramic system is really controllable.

Disclosure of Invention

In order to solve the above technical problems, an embodiment of the present invention provides a powder material for an alumina ceramic part and a preparation method thereof, wherein the powder material has a wide sintering temperature region, and the size fluctuation values of products in the same batch and different batches after sintering are less than one percent in the sintering range of 1470 ℃ to 1550 ℃.

In order to achieve the purpose, the technical scheme of the invention is as follows:

The powder of the alumina ceramic material comprises, by weight, 70-95% of Al2O3, 0-15% of Suzhou soil, 0-8% of burnt talc, 1-8% of calcite, 1-10% of zirconium silicate and 0-5% of spodumene, wherein the Suzhou soil and the burnt talc are not 0 at the same time.

The invention also provides a preparation method of the alumina ceramic part, which comprises the following steps:

(1) ball milling the powder of the alumina ceramic material;

(2) Drying the ball-milled powder, putting the powder into a mixing roll, adding an organic binder with the powder mass fraction of 10-20%, and uniformly mixing at a certain temperature;

(3) Granulating the mixed raw materials, feeding the granulated raw materials into a hopper of a high-pressure injection molding machine, applying high temperature and high pressure to inject the granulated raw materials into a precise mold, and opening the mold to obtain a ceramic blank;

(4) Degreasing the ceramic blank;

(5) And drying the degreased ceramic blank, performing glue discharging treatment, and heating for sintering to obtain the alumina ceramic part with controllable sintering shrinkage and consistency.

Preferably, the powder material in the step (1) is put into a ball mill for ball milling, the ball mill is a horizontal ceramic ball mill, a stirring mill, a sand mill, a V-shaped mixer or an air flow mill, and the ball milling time is 1-18 hours.

preferably: the organic binder in the step (2) is a multi-component wax-based system and consists of 50 to 75 weight percent of paraffin, 10 to 30 weight percent of high-density polyethylene and 3 to 15 weight percent of stearic acid, and all the components are added into a mixing machine to be melted and stirred, and are cooled for standby after being fully and uniformly mixed.

preferably: the injection pressure in the step (3) is 20-50 MPa, and the injection temperature is 120-180 ℃.

Preferably: the degreasing solvent in the step (4) is dichloromethane, trichloromethane or environment-friendly oil.

Preferably: the step (5) is specifically as follows: drying the degreased ceramic blank, then preserving heat at 650 ℃ for 2 hours for glue removal treatment, wherein the heating rate is 20 ℃/h, then heating to 1470-1550 ℃ for sintering, the heating rate is 120-180 ℃/h, and the heat preservation time is 2-16 hours, thus obtaining the alumina ceramic material with controllable sintering shrinkage and consistency.

The invention further aims to protect the alumina ceramic part prepared by the preparation method of the alumina ceramic part.

The invention has the beneficial effects that:

The product made of the alumina ceramic material powder claimed in the embodiment has the size fluctuation value of less than one percent in the same batch and different batches after sintering.

The method for preparing the alumina ceramic part claimed in the embodiment has the advantages that the product manufactured by adopting the high-pressure injection molding process has high precision, the near-net-size molding of the alumina ceramic part can be realized without any processing, the traditional ceramic injection process can only realize products with the weight of less than 200 g and the wall thickness of less than 5mm, and the process provided by the invention realizes the batch production of the products with the weight of more than 600 g, the height of more than 200 mm and the wall thickness of more than 10 mm.

the alumina structural member prepared by the preparation method of the invention has wide application field, realizes low-deformation sintering of the three-dimensional precise structural member, can meet the requirements of metal and high polymer materials on dimensional precision in batches without processing the product, greatly expands the ceramic application field, and has the potential of widely replacing metal, high polymer materials and the like.

Detailed Description

In order to better understand the technical solution of the present invention, the following embodiments are provided to further explain the present invention.