An inorganic non-metallic anchor and method of manufacture

Abstract

The present application relates to the technical field of refractory material, and more particularly to an inorganic non-metal anchor and a preparation method thereof. The inorganic non-metal anchor base (2) is made of 0Cr25Ni20 heat-resistant alloy steel, one end of the inorganic non-metal anchor base (2) is welded on a furnace shell or framework, and the other end of the inorganic non-metal anchor base (2) is buckled into a positioning hole, i.e., a through hole (4) and a lower half-closed hole (5) reserved in the inorganic non-metal anchor; the inorganic non-metal anchor base (2) is wrapped in a heat preservation layer, and the inorganic non-metal anchor base (2) is covered with a refractory lining, so that oxidation and corrosion of the heat-resistant alloy steel can be avoided; the inorganic non-metal anchor base (2) can be installed once and used multiple times, thereby saving construction period; and the inorganic non-metal anchor is composed of the following components in proportion to weight: 45-65 parts of alumina powder, 10-20 parts of silicon carbide whisker, 1-5 parts of industrial silicon powder, and 15-25 parts of silicon dioxide powder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refractory materials, in particular to an inorganic non-metallic anchor and a preparation method. BACKGROUND

[0002] The anchor for high-temperature industrial furnace is a component for connecting the refractory lining, refractory prefabricated parts and refractory fiber felt with the furnace shell or steel structure. The traditional anchor is made of heat-resistant alloy steel. With the increase of temperature, the metal properties will change. Under high temperature, with the continuous extension of the load action time, the mechanical properties of the anchor will decrease, and the connection effect will decrease. Under high temperature, the metal properties are active, and the heat-resistant alloy steel gradually corrodes, expands in volume and deteriorates in performance under the continuous action of oxygen, sulfur dioxide and water vapor, which accelerates the damage of the refractory material. The heat-resistant alloy steel has a high thermal expansion coefficient, which is generally 2-3 times that of the refractory material. It is easy to crack the refractory lining at the temperature intermittent change position, which accelerates the damage of the refractory lining. The heat-resistant alloy steel anchor has poor oxidation resistance and starts to oxidize and deteriorate at a temperature of 1200℃, while the temperature of many parts of the industrial furnace is above 1400℃.

[0003] In view of the problems of the heat-resistant alloy steel anchor in the background art, there is an urgent need to provide an inorganic non-metallic anchor with high use temperature, low thermal expansion coefficient, oxidation resistance and sulfur dioxide corrosion resistance.

[0004] In the Chinese patent database, "inorganic non-metallic and anchor" is used for abstract retrieval, and no related technology is found. SUMMARY

[0005] The purpose of the application is to provide an inorganic non-metallic anchor and a preparation method with better effect, and the specific purposes are shown in the multiple substantial technical effects of the specific implementation part.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] An inorganic non-metallic anchor, characterized in that,

[0008] The inorganic non-metallic anchor comprises a ceramic-based anchor 1, and the ceramic-based anchor 1 is Y-shaped. The Y-shaped ceramic-based anchor 1 comprises a through hole 4, and a lower semi-closed hole 5 is arranged below the Y-shaped ceramic-based anchor 1.

[0009] Further comprising an inorganic non-metallic anchor base 2, the inorganic non-metallic anchor base 2 comprises two arms, and the two arms are connected into one body through an arc-shaped arm on one side.

[0010] The two arms pass through the whole expansion sleeve 31 and the half expansion sleeve 32, and then pass through the through hole 4 and the lower semi-closed hole 5.

[0011] The inorganic non-metal anchorage base 2 is made of 0Cr25Ni20 heat-resistant alloy steel, one end of the inorganic non-metal anchorage base 2 is welded on a furnace shell or framework, and the other end of the inorganic non-metal anchorage base 2 is buckled into a positioning hole, i.e., a through hole 4 and a lower half-closed hole 5, reserved for the inorganic non-metal anchorage;

[0012] The inorganic non-metal anchorage base 2 is wrapped in a thermal insulation layer, and the inorganic non-metal anchorage base 2 is covered outside by a refractory lining, so that oxidation and corrosion of the heat-resistant alloy steel can be avoided; the inorganic non-metal anchorage base 2 can be installed once and used multiple times to save construction period;

[0013] The inorganic non-metal anchorage is composed of the following components in proportion by weight:

[0014] Alumina powder 45-65 parts;

[0015] Silicon carbide whisker 10-20 parts;

[0016] Industrial silicon powder 1-5 parts;

[0017] Silicon dioxide powder 15-25 parts.

[0018] The further technical scheme of the present application is characterized in that,

[0019] The component composition further comprises one or more of the following additives: sintering aid, antioxidant, dispersant and binder, and the content of the additives is 5-10 parts.

[0020] The further technical scheme of the present application is characterized in that,

[0021] The alumina powder has a diameter of 2-5 um, Al2O3≥99.5%, and (Na2O+k2O)≤0.2%;

[0022] The silicon carbide whisker has a diameter of 0.1-0.6 um, a length of 10-50 um, and a purity of >99%;

[0023] The industrial silicon powder has a 500-mesh residue of ≤15% and a purity of >99%;

[0024] The silicon dioxide powder has a diameter of 2-5 um and SiO2≥99%;

[0025] The further technical scheme of the present application is characterized in that, the sintering aid is any one or more of nano-alumina powder, magnesium oxide and calcium oxide; the antioxidant is any one or more of aluminum powder and zinc oxide; the dispersant is sodium pyrophosphate; and the binder is cellulose.

[0026] The application discloses a preparation method of an inorganic nonmetal anchor, and belongs to the technical field of inorganic nonmetal anchors.

[0027] The nonmetal anchor raw material is mainly composed of alumina powder, silica powder and silicon carbide whisker, the alumina powder and the silica powder are reacted to generate mullite at high temperature, and the refractoriness of the mullite is up to 1850 DEG C. The mullite is very stable, has the properties of high refractoriness, heat shock resistance, chemical corrosion resistance, good creep resistance, high load softening temperature, good volume stability and strong electrical insulation, and is an ideal high-grade refractory material; the silicon carbide whisker is a single crystal fiber, has high strength and high temperature resistance, and is added into the inorganic nonmetal anchor body as a reinforcing component to play a good reinforcing and toughening role; the industrial silicon powder has good oxidation resistance, can prevent the silicon carbide from being oxidized in an oxidizing atmosphere at high temperature, and also plays a reinforcing and toughening role by being added; the heat-resistant alloy steel is used as the base, is embedded in the heat preservation material and works at a low temperature, and the outer refractory material working lining prevents harmful substances from invading and avoids corrosion and oxidation.

[0028] The further technical scheme of the application is characterized in that,

[0029] The weight proportions of the components are as follows: the alumina powder is 59 parts, the silica powder is 21 parts, the silicon carbide whisker is 13 parts, the industrial silicon powder is 2 parts, and the additive is 5 parts; all the raw materials are mixed together, deionized water is added, and the mixture is ground in a ball mill for 20 hours; after being degassed, the mixture is poured into a mold for forming; the formed green body is dried at 200 DEG C for 10 hours, and then is heated to 1500 DEG C at a heating rate of 50 DEG C / h, and is kept at 1500 DEG C for 8 hours, so the inorganic nonmetal anchor is obtained; the heat-resistant alloy steel base is made of 0Cr25Ni20 material, and is punched into a U shape by a punch press, and then is sleeved with a 2mm-thick plastic expansion sleeve at the head of the U shape.

[0030] Compared with the prior art, the application has the following beneficial effects: the application solves the problems of the heat-resistant alloy steel anchor, such as large thermal expansion at high temperature, poor acid and alkali corrosion resistance, easy oxidation, and continuously reduced mechanical properties under high temperature load; the split design is adopted, the heat-resistant alloy steel base is matched with the inorganic nonmetal anchor, the heat-resistant alloy steel works at a low temperature, the use amount of the heat-resistant alloy steel is reduced by 70%, the product cost is greatly reduced, the heat-resistant alloy steel base can be used for multiple times after being welded once, and the welding workload on site is reduced; through optimization of the proportioning, a large amount of mullite crystals are generated in the inorganic nonmetal anchor during high-temperature sintering, and the addition of the silicon carbide whisker and the industrial silicon makes the inorganic nonmetal anchor have the advantages of high refractoriness, heat shock resistance, chemical corrosion resistance, good creep resistance, high load softening temperature, good volume stability, high bending tensile strength and high toughness. BRIEF DESCRIPTION OF DRAWINGS

[0031] To further illustrate the present application, further description will be made in connection with the accompanying drawings:

[0032] Figure 1 is a perspective view of the present application;

[0033] Figure 2 is a side view of the non-metal anchor;

[0034] Figure 3 is an elevation view of the non-metal anchor;

[0035] wherein: 1. ceramic base anchor; 2. inorganic non-metal anchor base; 3. plastic expansion sleeve; 4. through hole; 5. lower half closed hole; 31. whole expansion sleeve; 32. half expansion sleeve. DETAILED DESCRIPTION

[0036] The present application will be further described with reference to the drawings and specific embodiments, it should be understood that the following specific embodiments are only used to illustrate the present application and not used to limit the scope of the present application. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, unless otherwise specifically stated and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or apparatus.

[0038] The patent provides various parallel schemes, and different expressions belong to improved schemes or parallel schemes based on the basic scheme. Each scheme has its own unique features. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other. The fixing mode not expressed in the text can be any one of the fixing modes such as threaded fixing, bolt fixing or glue bonding.

[0039] Embodiments one to three: in combination with all the drawings; an inorganic non-metallic anchor, characterized in that,

[0040] The inorganic non-metallic anchor comprises a ceramic-based anchor 1, which is Y-shaped, and comprises a through hole 4, and a lower semi-closed hole 5 arranged below the Y-shaped ceramic-based anchor 1;

[0041] It also comprises an inorganic non-metallic anchor base 2, which comprises two arms connected by an arc-shaped arm on one side;

[0042] The two arms pass through the whole expansion sleeve 31 and the half expansion sleeve 32, and then pass through the through hole 4 and the lower semi-closed hole 5;

[0043] The inorganic non-metallic anchor base 2 is made of 0Cr25Ni20 heat-resistant alloy steel, one end of the inorganic non-metallic anchor base 2 is welded on the furnace shell or framework, and the other end of the inorganic non-metallic anchor base 2 is buckled into the positioning hole of the inorganic non-metallic anchor, that is, the through hole 4 and the lower semi-closed hole 5;

[0044] The inorganic non-metallic anchor base 2 is wrapped in a thermal insulation layer, and the outside of the inorganic non-metallic anchor base 2 is covered with a refractory lining, which can avoid the oxidation and corrosion of the heat-resistant alloy steel; the inorganic non-metallic anchor base 2 can be installed once and used multiple times to save construction period;

[0045] The inorganic non-metallic anchor is composed of the following three groups in terms of weight proportion:

[0046]

[0047] One or more of the sintering aids, antioxidants, dispersants and binders, and the specific content proportion of the admixture of the sintering aids, antioxidants, dispersants and binders is 5-10 parts. The average setting of each component in the admixture is set.

[0048]

[0049] The technical effect and implementation process of the technical scheme of the present application and the basic function are as follows: all the above raw materials are mixed together, and then a proper amount of deionized water is added and ground in a ball mill for 20h, and then poured into a mold after degassing; the formed green body is dried at 200 DEG C for 10h, and then heated to 1500 DEG C at a heating rate of 50 DEG C / h, and kept for 8h, and then obtained; the heat-resistant alloy steel base is made of 0Cr25Ni20 material square steel with a side length of 14mm, which is punched into a U shape by a punch, and a 2mm thick plastic expansion sleeve is sleeved at the U-shaped head, and then obtained.

[0050] The present application uses a heat-resistant steel alloy base combined with an inorganic non-metal anchor, which replaces the traditional heat-resistant alloy steel anchor. The raw materials of the non-metal anchor mainly include alumina powder, silica powder and silicon carbide whiskers. At high temperature, the alumina powder and silica powder react to form mullite, and the refractoriness is as high as 1850 DEG C. Mullite is very stable, has high refractoriness, good thermal shock resistance, chemical corrosion resistance, creep resistance, high load softening temperature, good volume stability, strong electrical insulation, etc. It is an ideal high-grade refractory material. Silicon carbide whisker is a single crystal fiber with few defects, high strength and high temperature resistance. It is added to the inorganic non-metal anchor body as a reinforcing component to play a good reinforcing and toughening effect. Industrial silicon powder has good oxidation resistance, which can prevent silicon carbide from being oxidized in a high-temperature oxidation atmosphere. The addition of industrial silicon also plays a reinforcing and toughening effect. The heat-resistant alloy steel is used as the base and is embedded in the insulation material to work at a lower temperature. The outer covering refractory material working lining prevents harmful substances from entering and avoids erosion and oxidation.

[0051] In example four, as a further improved scheme or a parallel scheme or an alternative independent scheme,

[0052] A preparation method of an inorganic non-metal anchor, characterized in that the inorganic non-metal anchor is used as above,

[0053] The non-metal anchoring material is mainly made of alumina powder, silica powder and silicon carbide whisker. The alumina powder and silica powder react to form mullite at high temperature, and the refractoriness of the mullite is as high as 1850 DEG C. The mullite is very stable, and has the properties of high refractoriness, heat shock resistance, chemical corrosion resistance, good creep resistance, high load softening temperature, good volume stability, strong electrical insulation, etc. It is an ideal high-grade refractory material. The silicon carbide whisker is a single crystal fiber with high strength and high temperature resistance. It is added to the inorganic non-metal anchoring body as a reinforcing component to play a good reinforcing and toughening effect. The industrial silicon powder has good oxidation resistance, which can prevent the oxidation of silicon carbide in an oxidizing atmosphere at high temperature. The addition of industrial silicon also plays a reinforcing and toughening effect. The heat-resistant alloy steel is used as the base, which is embedded in the heat preservation material and works at a low temperature. The outer surface is covered with a refractory material working lining to prevent harmful substances from entering and avoid corrosion and oxidation.

[0054] In a further improved scheme or a parallel scheme or an alternative independent scheme, the alumina powder has a diameter of 2-5 um, Al2O3≥99.5%, and (Na2O+k2O)≤0.2%.

[0055] The silicon carbide whisker has a diameter of 0.1-0.6 um, a length of 10-50 um, and a purity of >99%.

[0056] The industrial silicon powder has a 500-mesh residue of ≤15% and a purity of >99%.

[0057] The silica powder has a diameter of 2-5 um and SiO2≥99%.

[0058] The sintering aid is any one or more of nano-alumina powder, magnesium oxide and calcium oxide. The anti-oxidant is any one or more of aluminum powder and zinc oxide. The dispersing agent is sodium pyrophosphate. The binding agent is cellulose.

[0059] The patent has the advantages of reducing the use of heat-resistant steel materials, reducing the use cost, similar deformation of the non-metal anchoring material and the refractory material at high temperature, reducing the damage of the thermal expansion of the metal anchoring material to the refractory material, convenient installation, metal base in the heat preservation layer, reusable, reducing the welding workload on the maintenance site, only replacing the ceramic-based anchoring material plastic expansion sleeve, and long service life.

[0060] It should be noted that the multiple schemes provided by the patent include a basic scheme itself, are independent of each other, and do not restrict each other, but they can also be combined without conflict to achieve multiple effects together.

[0061] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. An inorganic non-metallic anchorage, characterized in that, the inorganic non-metallic anchorage comprises a ceramic base anchorage (1), the ceramic base anchorage (1) is Y-shaped, the Y-shaped ceramic base anchorage (1) comprises a through hole (4), and a lower semi-closed hole (5) is arranged below the Y-shaped ceramic base anchorage (1); further comprising an inorganic non-metallic anchorage base (2), the inorganic non-metallic anchorage base (2) comprises two arms, and the two arms are connected on one side by an arc-shaped arm; the two arms pass through the whole expansion sleeve (31) and the half expansion sleeve (32) and then pass through the through hole (4) and the lower semi-closed hole (5); the inorganic non-metallic anchorage base (2) is made of 0Cr25Ni20 heat-resistant alloy steel, one end of the inorganic non-metallic anchorage base (2) is welded on a furnace shell or a framework, and the other end of the inorganic non-metallic anchorage base (2) is buckled into the positioning hole, i.e., the through hole (4) and the lower semi-closed hole (5) reserved for the inorganic non-metallic anchorage; the inorganic non-metallic anchorage base (2) is wrapped in a heat preservation layer, and the inorganic non-metallic anchorage base (2) is covered with a refractory lining, so that oxidation and corrosion of the heat-resistant alloy steel can be avoided; the inorganic non-metallic anchorage base (2) can be installed at one time and used multiple times to save construction period; the inorganic non-metallic anchorage comprises the following components in proportion by weight: alumina powder 45-65 parts; silicon carbide whisker 10-20 parts; industrial silicon powder 1-5 parts; silicon dioxide powder 15-25 parts; additive 5-10 parts.

2. An inorganic non-metallic anchor according to claim 1, wherein the additive comprises one or more of sintering aid, antioxidant, dispersant and binder.

3. The inorganic non-metallic anchorage according to claim 1, characterized in that, the alumina powder has a diameter of 2-5 um, Al2O3≥99.5%, and (Na2O+k2O)≤0.2%; the silicon carbide whisker has a diameter of 0.1-0.6 um, a length of 10-50 um, and a purity of >99%; the industrial silicon powder has a 500-mesh residue of ≤15% and a purity of >99%; the silicon dioxide powder has a diameter of 2-5 um and SiO2≥99%. the sintering aid is any one or more of nano-alumina powder, magnesium oxide and calcium oxide; the antioxidant is any one or more of aluminum powder and zinc oxide; the dispersant is sodium pyrophosphate; and the binder is cellulose.

4. An inorganic non-metallic anchor according to claim 2, wherein The inorganic non-metallic anchorage according to any one of claims 1-4 is used, 5. A method of making an inorganic non-metallic anchor, characterized by, ​ The non-metal anchorage raw material is mainly composed of alumina powder, silica powder and silicon carbide whisker; the alumina powder and the silica powder react to generate mullite at high temperature, and the refractoriness is up to 1850 DEG C; the mullite is very stable, has high refractoriness, heat shock resistance, chemical corrosion resistance, good creep resistance, high load softening temperature, good volume stability, strong electrical insulation and other performances, and is an ideal high-grade refractory material; the silicon carbide whisker is a single crystal fiber, has high strength and high temperature resistance, and is added into the inorganic non-metal anchorage body as a reinforcing component to play a good reinforcing and toughening effect; the industrial silicon powder has good oxidation resistance, can prevent the silicon carbide from being oxidized in the high temperature oxidation atmosphere, and also plays a reinforcing and toughening effect by adding the industrial silicon; the inorganic non-metal anchorage base (2) is embedded in the heat preservation material and works at low temperature, and the outer covering refractory material working lining prevents harmful substances from entering to avoid erosion and oxidation. The alumina powder, the silica powder, the silicon carbide whisker, the industrial silicon powder and the additive are mixed together; after being mixed uniformly, a proper amount of deionized water is added and is fully ground in a ball mill for 20h, and then is poured into a mold after exhausting; the formed green body is dried at 200 DEG C for 10h, and then is heated to 1500 DEG C at a heating speed of 50 DEG C / h, and is kept for 8h, and then is obtained; the inorganic non-metal anchorage base (2) is made of 0Cr25Ni20 material square steel with a side length of 14mm, is punched into a U shape by a punching machine, and is sleeved with a 2mm thick plastic expansion sleeve at the U-shaped head.

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