阅读说明：本技术 一种绝缘定位陶瓷套件材料及其制备工艺 (Insulating and positioning ceramic external member material and preparation process thereof ) 是由 晏志新 吴涛 于 2020-08-03 设计创作，主要内容包括：本发明公开一种绝缘定位陶瓷套件材料及其制备工艺,涉及陶瓷材料技术领域。本发明公开的绝缘定位陶瓷套件材料由以下重量份数的原料组成：氧化锆40-70份、氧化铝纤维10-20份、氧化铜5-10份、氧化铁5-10份、氧化钇5-10份、二硒化铌2-5份、石墨2-5份、水玻璃0.5-1份和除泡剂0.1-0.5份,所述除泡剂为聚二甲基硅氧烷。此外,本发明还提供了绝缘定位陶瓷套件材料的制备方法。本发明的绝缘定位陶瓷套件材料不导电、不导磁,具有高强度、高韧性和高耐磨性,在高温条件下工作,不易变形,不易磨损,不易断裂,延长了定位陶瓷套件的使用寿命,且制备工艺简单,加工成本较低。(The invention discloses an insulating and positioning ceramic external member material and a preparation process thereof, and relates to the technical field of ceramic materials. The invention discloses an insulating positioning ceramic external member material which is composed of the following raw materials in parts by weight: 40-70 parts of zirconium oxide, 10-20 parts of aluminum oxide fiber, 5-10 parts of copper oxide, 5-10 parts of ferric oxide, 5-10 parts of yttrium oxide, 2-5 parts of niobium diselenide, 2-5 parts of graphite, 0.5-1 part of water glass and 0.1-0.5 part of defoaming agent, wherein the defoaming agent is polydimethylsiloxane. In addition, the invention also provides a preparation method of the insulating positioning ceramic suite material. The insulating positioning ceramic external member material provided by the invention is non-conductive and non-magnetic, has high strength, high toughness and high wear resistance, is not easy to deform, wear and break when working under a high-temperature condition, prolongs the service life of the positioning ceramic external member, and is simple in preparation process and low in processing cost.)

1. An insulating positioning ceramic external member material is characterized by comprising the following raw materials in parts by weight: 40-70 parts of zirconium oxide, 10-20 parts of aluminum oxide fiber, 5-10 parts of copper oxide, 5-10 parts of ferric oxide, 5-10 parts of yttrium oxide, 2-5 parts of niobium diselenide, 2-5 parts of graphite, 0.5-1 part of water glass and 0.1-0.5 part of defoaming agent, wherein the defoaming agent is polydimethylsiloxane.

2. The insulating and positioning ceramic kit material as claimed in claim 1, which is composed of the following raw materials in parts by weight: 50-60 parts of zirconium oxide, 12-18 parts of aluminum oxide fiber, 6-8 parts of copper oxide, 6-9 parts of ferric oxide, 7-8 parts of yttrium oxide, 3-4 parts of niobium diselenide, 2-5 parts of graphite, 0.6-0.8 part of water glass and 0.2-0.4 part of defoaming agent.

3. The insulating and positioning ceramic external member material as claimed in claim 2, characterized by comprising the following raw materials in parts by weight: 55 parts of zirconium oxide, 15 parts of alumina fiber, 7 parts of copper oxide, 7 parts of iron oxide, 7.5 parts of yttrium oxide, 3.5 parts of niobium diselenide, 4 parts of graphite, 0.7 part of water glass and 0.3 part of defoaming agent.

4. The preparation method of the insulating and positioning ceramic suite material as claimed in claims 1-3, which is characterized by comprising the following steps:

(1) respectively weighing zirconium oxide, aluminum oxide fiber, copper oxide, iron oxide, yttrium oxide and graphite according to the weight parts, uniformly mixing, and grinding to obtain granular powder with the average particle size of 40-60 mu m to obtain a mixture A;

(2) adding the niobium diselenide, the water glass and the defoaming agent in parts by weight into the mixture A, stirring for 30min, uniformly mixing with water, then placing into a ball mill, and carrying out ball milling for 6-8h to obtain the required slurry;

(3) filtering the slurry ground in the step (2) in a suction way, and processing the slurry into granular powder with the average grain diameter of less than 40 mu m by using a centrifugal spray dryer for later use;

(4) putting the powder prepared in the step (3) into a hot-pressing die with a required shape, and performing compression molding under the pressure of 250-350MPa to prepare a blank;

(5) and (3) placing the blank prepared in the step (4) in a sintering furnace, setting the pressure in the sintering furnace to be 2-3MPa, heating to 1300-1500 ℃ at the speed of 5-10 ℃/min in an oxygen atmosphere for sintering, keeping the temperature for 8-10h, cooling to room temperature at the speed of 5 ℃/min, and taking out to prepare the insulating positioning ceramic sleeve material.

5. The method for preparing the insulating positioning ceramic kit material as claimed in claim 4, wherein the mass of the water in the step (2) is 2-3 times of the total mass of the raw material components of the insulating positioning ceramic kit material.

6. The method as claimed in claim 4, wherein the ball milling rate in step (2) is 200-250r/min, and the ball-to-material ratio is 6: 1.

Technical Field

The invention belongs to the technical field of ceramic materials, and particularly relates to an insulating and positioning ceramic sleeve material and a preparation process thereof.

Background

The positioning kit is a part which participates in limiting the free movement of an article, and is a positioning part designed for accurately positioning two adjacent parts of a mold in the mold consisting of two or more parts. The positioning kit is used as an important mechanical basic part of modern mechanical equipment and is widely applied to various fields of science and technology and economy. The existing positioning external member can be divided into a positioning metal external member, a positioning plastic external member and a positioning ceramic external member. The positioning metal sleeve is poor in corrosion resistance, not wear-resistant and conductive, and is not suitable for some special fields; the positioning plastic sleeve has poor hardness, is easy to deform, cannot resist high temperature and has short service life, and is only suitable for specific fields. Due to the continuous development of industrial technology, under some harsh conditions, such as the fields of aviation, aerospace, nuclear energy, chemistry, petroleum, food and the like, the positioning sleeve still can normally work under special environments of high temperature, high pressure, corrosion, vacuum, no lubrication and the like, and the positioning plastic sleeve and the positioning metal sleeve can not meet the use requirements far away, so that the positioning ceramic sleeve is gradually applied.

The positioning ceramic external member has extremely strong corrosion resistance, can be used in strong acid, strong alkali and seawater, and also has excellent performances of high hardness, non-conductivity, non-permeability and the like, which is incomparable with the positioning metal external member. However, the use of ceramic materials for the manufacture of positioning kits presents problems, such as: when the positioning piece is used as a positioning piece, the positioning piece is positioned between two dies, and when the pressure is overlarge, the material is easy to brittle fracture; the material is easy to crack under the high-temperature condition; the material has poor wear resistance, easy abrasion and short service life; the problems of high sintering temperature, difficult processing, higher processing cost and the like of the material influence the application effect of the positioning ceramic.

Disclosure of Invention

The invention mainly aims to provide an insulating and positioning ceramic sleeve material and a preparation process thereof.

In order to realize the purpose of the invention, the invention provides an insulating and positioning ceramic sleeve material which is prepared from the following raw materials in parts by weight: 40-70 parts of zirconium oxide, 10-20 parts of aluminum oxide fiber, 5-10 parts of copper oxide, 5-10 parts of ferric oxide, 5-10 parts of yttrium oxide, 2-5 parts of niobium diselenide, 2-5 parts of graphite, 0.5-1 part of water glass and 0.1-0.5 part of defoaming agent, wherein the defoaming agent is polydimethylsiloxane.

Further, the insulating positioning ceramic external member material is composed of the following raw materials in parts by weight: 50-60 parts of zirconium oxide, 12-18 parts of aluminum oxide fiber, 6-8 parts of copper oxide, 6-9 parts of ferric oxide, 7-8 parts of yttrium oxide, 3-4 parts of niobium diselenide, 2-5 parts of graphite, 0.6-0.8 part of water glass and 0.2-0.4 part of defoaming agent.

Further, the insulating positioning ceramic external member material comprises the following raw materials in parts by weight: 55 parts of zirconium oxide, 15 parts of alumina fiber, 7 parts of copper oxide, 7 parts of iron oxide, 7.5 parts of yttrium oxide, 3.5 parts of niobium diselenide, 4 parts of graphite, 0.7 part of water glass and 0.3 part of defoaming agent.

The preparation method of the insulating positioning ceramic suite material specifically comprises the following steps:

(1) respectively weighing zirconium oxide, aluminum oxide fiber, copper oxide, iron oxide, yttrium oxide and graphite according to the weight parts, uniformly mixing, and grinding to obtain granular powder with the average particle size of 40-60 mu m to obtain a mixture A;

(2) adding the niobium diselenide, the water glass and the defoaming agent in parts by weight into the mixture A, stirring for 30min, uniformly mixing with water, then placing into a ball mill, and carrying out ball milling for 6-8h to obtain the required slurry;

(3) filtering the slurry ground in the step (2) in a suction way, and processing the slurry into granular powder with the average grain diameter of less than 40 mu m by using a centrifugal spray dryer for later use;

(4) putting the powder prepared in the step (3) into a hot-pressing die with a required shape, and performing compression molding under the pressure of 250-350MPa to prepare a blank;

(5) and (3) placing the blank prepared in the step (4) in a sintering furnace, setting the pressure in the sintering furnace to be 2-3MPa, heating to 1300-1500 ℃ at the speed of 5-10 ℃/min in an oxygen atmosphere for sintering, keeping the temperature for 8-10h, cooling to room temperature at the speed of 5 ℃/min, and taking out to prepare the insulating positioning ceramic sleeve material.

Further, the mass of water in the step (2) is 2-3 times of the total mass of the raw material components of the insulating and positioning ceramic sleeve material.

Further, the ball milling rate in the step (2) is 200-.

The invention achieves the following beneficial effects:

1. the zirconia of the invention has higher melting point, larger hardness, better wear resistance, low thermal conductivity and low expansion coefficient, and when yttrium oxide, copper oxide and ferric oxide are added in the preparation process of the zirconia ceramics, the zirconia ceramics sintered at high temperature generates two crystals, namely cubic crystal and tetragonal crystal. When the ceramic is subjected to an external force, the tetragonal crystal becomes a monoclinic crystal, and the volume rapidly expands. The volume of the crystal is rapidly increased, and thus the propagation of the micro cracks existing in the ceramic can be prevented. Therefore, the invention is not easy to generate cracks and increases the toughness of the insulating positioning ceramic.

2. The alumina fiber is a polycrystalline inorganic fiber with the main component of alumina, is added into zirconia ceramic, is used for stabilizing zirconia crystalline phase and inhibiting the growth of zirconia crystal grains at high temperature, so that the zirconia ceramic keeps compact crystal structure, and the high-strength alumina fiber can share part of external load, thereby improving the strength of the insulating positioning ceramic; a weak interface is formed between the alumina fiber and the zirconia matrix and is used for washing hands with external energy, and the brittleness of the ceramic material is improved, so that the toughness of the insulating positioning ceramic is improved.

3. The copper oxide and the iron oxide are used together as the solid lubricant, so that the friction coefficient can be effectively reduced, the generation of friction heat can be reduced, the high-temperature use performance of the insulating positioning ceramic can be effectively improved, and the service life of the insulating positioning ceramic can be prolonged.

4. The niobium diselenide and the graphite are used as a solid lubricant and a dispersing agent, so that other raw materials can be uniformly dispersed, the friction coefficient can be effectively reduced, and the wear resistance of the insulating positioning ceramic is enhanced.

5. The silicon dioxide component and the yttrium oxide in the water glass have synergistic effect, the decomposition of the zirconium oxide can be inhibited, and the densification of the material is completed by dissolution and diffusion through liquid phase sintering; the water glass is used as a binder and is melted under the action of high temperature, so that other raw materials can be tightly bound together, and the phenomena of dispersion and collapse can not be generated in the sintering process.

6. The zirconia of the present invention is an oxygen ion conductor doped with low valence ions such as Cu²⁺、Fe³⁺Etc. will replace part of Zr⁴⁺Will generate O^2-However, the sintering process of the present invention is carried out in an oxygen atmosphere, under a high temperature condition, Zr⁴⁺Can not be replaced, and has no or little O in the insulating and positioning ceramic material^2-Therefore, the conductivity of the present invention is not enhanced with the increase of temperature, and the insulating positioning ceramic material has excellent insulating property under high temperature condition.

7. The invention adopts the oxidation ditch as a matrix, and by adding zirconia, alumina fiber, copper oxide, ferric oxide, yttrium oxide, niobium diselenide, water glass and defoaming agent, all the components are matched with each other, so that under the synergistic action of all the components, the wear resistance, hardness and toughness of the insulating positioning ceramic external member material are improved, and the insulating positioning ceramic external member material is not easy to deform, wear and fracture when working under a high-temperature condition, so that the service life of the positioning ceramic external member is prolonged; the preparation process is simple, the sintering temperature is low, and the processing cost of the ceramic is reduced.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The insulating positioning ceramic sleeve material, the preparation process thereof, the preparation method thereof and the preparation method thereof of the invention are described below with reference to specific embodiments.

The agent-material ratio is the specific gravity of the mass of water and the total mass of each raw material component of the insulating and positioning ceramic sleeve material.