阅读说明：本技术 一种金属浇铸用螺旋孔型陶瓷过滤器 (Spiral hole type ceramic filter for metal casting ) 是由 李光强 王强 刘昱 黄奥 鄢文 郑万 顾华志 于 2019-10-25 设计创作，主要内容包括：本发明提供的金属浇铸用螺旋孔型陶瓷过滤器,包括螺旋孔型通道和两个泄流孔,螺旋孔型通道以叉排形式分布在陶瓷基体中,结构简单,易于成型和烧结,便于运输和安装；采用螺旋孔型通道结构,可使金属液向前流动的同时发生旋转,产生离心力,促使夹杂物的分离；由于金属浇铸用螺旋孔型陶瓷过滤器的化学成分为90wt％～95wt％的MgO、4wt％～8wt％的SiO<Sub>2</Sub>和2wt％～4wt％的ZrO<Sub>2</Sub>,所以其常温强度高,高温抗热冲击性能好,可以耐受1700℃或者更高温度的金属液冲击而不破碎；陶瓷基体表面及螺旋孔型通道表面有一层成分为CaO·2Al<Sub>2</Sub>O<Sub>3</Sub>或CaO·6Al<Sub>2</Sub>O<Sub>3</Sub>或Al<Sub>2</Sub>O<Sub>3</Sub>或TiO<Sub>2</Sub>或Re<Sub>2</Sub>O<Sub>3</Sub>功能氧化物涂层,提高了对夹杂物的吸附效率。(The spiral hole type ceramic filter for metal casting comprises a spiral hole type channel and two drainage holes, wherein the spiral hole type channel is distributed in a ceramic substrate in a fork-shaped manner, and the spiral hole type ceramic filter is simple in structure, easy to form and sinter and convenient to transport and install; the spiral hole type channel structure is adopted, so that molten metal can rotate while flowing forwards, centrifugal force is generated, and impurities are separated; the chemical components of the spiral hole type ceramic filter for metal casting are 90-95 wt% of MgO and 4-8 wt% of SiO 2 And 2 to 4 wt% of ZrO 2 Therefore, the alloy has high normal temperature strength and good high-temperature thermal shock resistance, and can resist the impact of molten metal at 1700 ℃ or higher without being broken; the surface of the ceramic matrix and the surface of the spiral hole type channel have a layer of CaO.2Al 2 O 3 Or CaO.6 Al 2 O 3 Or Al 2 O 3 Or TiO 2 Or Re 2 O 3 The functional oxide coating improves the adsorption efficiency of the impurities.)

1. A spiral hole type ceramic filter for metal casting comprises a filtering channel, and is characterized in that: the bottom of the ceramic filter is provided with two drain holes, the filter channel is in a spiral hole shape, the upper and lower rows of spiral hole-shaped channels are distributed in the ceramic matrix in a fork row shape, the vertical section of each spiral hole-shaped channel is circular, and the surface of the ceramic matrix and the surface of each spiral hole-shaped channel are provided with a layer of CaO.2Al serving as a chemical component₂O₃Or CaO.6 Al₂O₃Or Al₂O₃Or TiO₂Or Re₂O₃The functional oxide coating of (1).

2. The metal casting spiral pass ceramic filter of claim 1, wherein: the diameter of the spiral hole type channel is 1/4-1/3 of the thickness of the ceramic filter.

3. The metal casting spiral pass ceramic filter of claim 1, wherein: the horizontal distance between the two spiral hole type channels is 2-3 times of the diameter of the spiral line.

4. The metal casting spiral pass ceramic filter of claim 1, wherein: the vertical distance between the upper and lower rows of spiral hole-shaped channels is 2.5-3.5 times of the diameter of the spiral line.

5. The metal casting spiral pass ceramic filter of claim 1, wherein: the number of the spiral coils is not more than 3.

6. The metal casting spiral pass ceramic filter of claim 1, wherein: the diameter of the spiral line is 1.5 to 2.5 times of the diameter of the channel.

7. The metal casting spiral pass ceramic filter of claim 1, wherein: the thickness of the filter ranges from 60mm to 120mm according to the size of the filter.

8. The metal casting spiral pass ceramic filter of claim 1, wherein: the ceramic filter substrate is flat.

9. The metal casting spiral pass ceramic filter of claim 1, wherein: the chemical components of the spiral hole type ceramic filter are 90-95 wt% of MgO and 4-8 wt% of SiO₂And 2 to 4 wt% of ZrO₂。

Technical Field

The invention relates to a spiral hole type ceramic filter for metal casting, and belongs to the technical field of metal casting.

Background

The cleanliness of molten metal has important influence on the improvement of mechanical properties and mechanical properties of metal castings. With the increasing performance requirements of castings and subsequent processing products, the reduction of non-metallic inclusions in molten metal through various ways has become a key research point of metallurgists.

Because of the advantages of simple structure, high removal efficiency, convenient use and the like, the ceramic filter becomes a widely-used metal liquid purifying and filtering device at present. They are classified into ceramic foam filters and porous ceramic filters according to their structures. The preparation of the foamed ceramic filter generally adopts silicon carbide, aluminum oxide, zirconium oxide, alumina-carbon and the like, and the foamed ceramic filter similar to foam has good filtering effect, but has the defects of low high-temperature strength, poor impact resistance, incapability of resisting long-time impact of molten metal at high temperature, carburization of metal and the like, is not suitable for filtering and purifying a large amount of high-temperature molten metal, and limits wide application of the foamed ceramic filter in the field of metal casting.

The other type is a porous ceramic filter newly developed in recent years, and the filter has thick framework, smooth appearance, high thermal state strength, strong impact resistance and low production cost. At present, all porous ceramic filters are straight-hole type ceramic filters, and are characterized in that circular straight holes are uniformly distributed in a ceramic matrix. When the molten metal flows through the straight through hole, the change of the streamline makes the inclusions deviate from the original movement track, move towards the wall surface of the ceramic matrix, and then are adsorbed by the ceramic matrix, and finally are separated from the molten metal. But because the hole type structure is simpler, the capability of changing the motion trail of the inclusions is limited, and the removal rate of the inclusions is not high.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides the spiral hole type ceramic filter for metal casting, which has the advantages of simple structure, high-temperature thermal shock resistance, low cost and high impurity removal rate.

The technical scheme adopted for achieving the purpose of the invention is as follows: the spiral hole type ceramic filter for metal casting comprises a filtering channel, wherein two drainage holes are formed in the bottom of the ceramic filter, the filtering channel is in a spiral hole type, the upper and lower rows of spiral hole type channels are distributed in a ceramic matrix in a fork row mode, the vertical section of each spiral hole type channel is circular, and a layer of chemical component CaO.2Al is arranged on the surface of the ceramic matrix and the surface of each spiral hole type channel₂O₃Or CaO.6 Al₂O₃Or Al₂O₃Or TiO₂Or Re₂O₃The functional oxide coating of (1).

The diameter of the spiral hole type channel is 1/4-1/3 of the thickness of the ceramic filter.

The horizontal distance between the two spiral hole type channels is 2-3 times of the diameter of the spiral line.

The vertical distance between the upper row of the spiral hole-shaped channels and the lower row of the spiral hole-shaped channels is 2.5-3.5 times of the diameter of the spiral line.

The number of the spiral coils is not more than 3.

The diameter of the spiral line is 1.5-2.5 times of the diameter of the channel.

The thickness of the filter ranges from 60mm to 120mm according to the size of the filter.

The spiral hole type ceramic filter base body for metal casting is of a flat plate type.

The spiral hole type ceramic filter for metal casting comprises the chemical components of 90-95 wt% of MgO and 4-8 wt% of SiO₂And 2 to 4 wt% of ZrO₂。

According to the technical scheme, the spiral hole type ceramic filter for metal casting comprises a spiral hole type channel and two drainage holes, wherein the spiral hole type channel is distributed in a ceramic matrix in a fork-row mode, the number of spiral coils is not more than 3, the structure is simple, the forming and sintering are easy, the transportation and the installation are convenient, and the spiral hole type ceramic filter is suitable for the existing refractory material preparation process; and the spiral hole type channel structure is adopted, so that molten metal can flow forwards and rotate at the same time, and further, the molten metal can flow forwards and rotateCentrifugal force is generated to promote the separation of the impurities; the chemical components of the spiral hole type ceramic filter for metal casting are 90-95 wt% of MgO and 4-8 wt% of SiO₂And 2 to 4 wt% of ZrO₂The filter has high normal temperature strength and good high-temperature thermal shock resistance, and can resist the impact of molten metal at 1700 ℃ or higher without being broken; the surface of the ceramic matrix and the surface of the spiral hole type channel have a layer of CaO.2Al₂O₃Or CaO.6 Al₂O₃Or Al₂O₃Or TiO₂Or Re₂O₃The functional oxide coating improves the adsorption efficiency of the ceramic matrix to the impurities.

In conclusion, the technical scheme of the invention has the beneficial effects that:

(1) the spiral hole type ceramic filter for metal casting provided by the invention has the advantages of simple structure, easiness in molding and sintering, convenience in transportation and installation, and suitability for the existing refractory material preparation process;

(2) the spiral hole type ceramic filter for metal casting has high normal temperature strength and good high-temperature thermal shock resistance, and can resist the impact of molten metal at 1700 ℃ or higher without being broken;

(3) the spiral hole type channel can enable molten metal to rotate while flowing forwards, so that centrifugal force is generated, and impurities are separated;

(4) the functional oxide coating can improve the adsorption efficiency of the ceramic matrix to the impurities.

Drawings

FIG. 1 is a schematic structural view of a spiral hole type ceramic filter for metal casting according to the present invention;

FIG. 2 is a schematic view of a spiral bore type channel;

FIG. 3 is a side view of a spiral bore type passage;

FIG. 4 is a front view of a spiral hole type ceramic filter;

in the figure: 1 is the spiral pass passageway, 2 is the discharge orifice, and a is circular passageway diameter, and b is the helix pitch, and c is the helix diameter, and d is the horizontal distance between two spiral pass passageways, and e is the vertical distance between the upper and lower two rows of spiral pass passageways.

Detailed Description

The invention is further explained by the figures and the examples.

The structure of the spiral-hole type ceramic filter for metal casting provided by the invention is shown in figure 1 and comprises a spiral-hole type channel 1 and a drain hole 2. A schematic of a spiral bore type channel is shown in figure 2.