CN110845231A - Method for preparing ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting - Google Patents
Method for preparing ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting Download PDFInfo
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- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
A method for preparing ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting takes zirconia, alumina, silicon carbide, yttria, ceria and titanium dioxide as raw materials, and the raw materials are divided into a plurality of parts by weight; weighing water by taking prepared slurry with solid content of 80-85% as a target, uniformly mixing the water, a dispersing agent, a binder and a reinforcing agent to form a premixed liquid, placing the premixed liquid into a ball milling tank, then putting the raw materials into the ball milling tank in parts by parts according to the parts of the raw materials, carrying out ball milling after each part of the raw materials are put into the ball milling tank, sequentially prolonging the ball milling time after each batch of the raw materials are put into the ball milling tank, injecting the slurry prepared by ball milling into a mould, gradually increasing the grouting pressure, carrying out pressure maintaining for a certain time, demoulding to obtain a blank, drying and degumming, and sintering in an atmosphere furnace to obtain the ceramic cylinder sleeve. The prepared ceramic cylinder sleeve has the relative density of 98.9-99.3%, the bending strength of 1200-1275MPa, the fracture toughness of 10.5-11.8 MPa-m 1/2 and excellent comprehensive performance.
Description
Technical Field
The invention relates to a preparation method of a ceramic cylinder sleeve of a high-pressure slurry pump, in particular to a method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting.
Background
In oil drilling, a high-pressure mud pump is a heart of a drilling platform, wherein a cylinder sleeve is the most important part of the mud pump, the high-pressure mud pump is one of main wearing parts of the drilling pump under the working conditions of high pressure, high abrasion and strong corrosion when in operation, and the quality and the performance of the high-pressure mud pump directly influence the normal operation of the drilling operation.
At present, the more used cylinder sleeves mainly comprise a bimetallic cylinder sleeve, a ceramic cylinder sleeve taking alumina as a main body, a ceramic cylinder sleeve taking zirconia as a main body and the like, wherein the bimetallic cylinder sleeve is not wear-resistant and is easy to corrode, and the service life of the bimetallic cylinder sleeve is not more than 500 h. Most ceramic cylinder liners are formed by a dry forming method, for example, Chinese patent publication Nos. CN106699175A and CN106286274B, a blank is prepared by pre-pressing and then Cold Isostatic Pressing (CIP) the granulated powder after ball milling, and the forming method has the following defects: 1) no matter prepressing in a rigid mould, or in the process of cold isostatic pressing after covering, gradient loss exists in the pressure transmission of the blank along the thickness direction of the cylinder sleeve blank, so that the density distribution of the blank is uneven, the blank is easy to wholly or locally deform macroscopically, the cost and difficulty of post processing are increased, the uniformity of the internal structure of the blank is not ideal microscopically, and pores and abnormal-sized grains are easy to appear; 2) in the dry molding method, even if high isostatic pressure is used for pressure maintaining, the difference between the density of the obtained blank and the theoretical limit value is large, when micron-sized raw material powder is used, good density can be realized only by high sintering temperature, but the grain size of a sintered product is enlarged due to high sintering temperature, so that the strength and the wear resistance are reduced; if submicron or nanometer-level higher sintering active raw materials are used, although the densification temperature can be reduced, the cost is increased; 3) the dry forming has low automation degree, needs a plurality of processes, only a small part of the processes can be automated, and the rest processes need manual operation. Therefore, the dry forming method has differences from the use requirements in the aspects of strength, fracture toughness, wear resistance and the like of the sintered ceramic cylinder sleeve, and the actual service life of the ceramic cylinder sleeve is difficult to exceed 4000 hours.
At present, under the complex or severe conditions of oceans, deep wells and the like, especially with the application of large-displacement and high-pressure pumps, higher requirements are provided for the strength, wear resistance, corrosion resistance and service life of a cylinder sleeve.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect of non-ideal internal structure uniformity of the blank in the prior forming technology. The problem of low strength, and provides a method for preparing the ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) taking zirconia, alumina, silicon carbide, yttria, cerium oxide and titanium dioxide as raw materials, and dividing the raw materials into a plurality of parts by weight for later use.
(2) Weighing water according to the raw materials obtained in the step (1) by taking the slurry with the solid content of 80-85% as a target, and uniformly mixing the water, the dispersant, the binder and the reinforcing agent to form a premixed solution.
(3) Placing the premixed liquid prepared in the step (2) into a ball milling tank, then putting the raw materials into the ball milling tank in parts by parts and batches according to the parts of the raw materials, carrying out ball milling after putting each part of the raw materials, prolonging the ball milling time of each batch of the raw materials, and preparing the slurry for later use by ball milling.
(4) And (4) injecting the slurry prepared in the step (3) into a mould, gradually increasing the grouting pressure, maintaining the pressure for a certain time, and demoulding to obtain a blank.
(5) And (4) drying the blank obtained in the step (4), heating for degumming, and sintering in an atmosphere furnace to obtain the ceramic cylinder sleeve.
The dispersing agent is ammonium polyacrylate, ammonium citrate, ammonium polycarboxylate or polycarbonate.
The binder is polyvinyl alcohol.
The reinforcing agent is modified starch, tannin extract or cotton fiber.
The weight portions of the added components are respectively: 40-60 parts of zirconium oxide, 10-40 parts of aluminum oxide, 15-30 parts of silicon carbide, 5-8 parts of yttrium oxide, 3-5 parts of cerium oxide, 1-3 parts of titanium dioxide, 0.8-2.5 parts of dispersing agent, 1-3 parts of binder and 0.3-0.8 part of reinforcing agent.
The raw materials are divided into 3 equal parts, the 1 st part of raw material is directly put into the premixed liquid of a ball milling tank, the rotating speed of the ball milling tank is stabilized at 200-300r/m, and the ball milling is carried out for 1-2 h; keeping the ball milling rotation speed unchanged, adding the 2 nd raw material into a ball milling tank containing the 1 st raw material, continuing ball milling for 3-5h, directly adding the 3 rd batch into the ball milling tank containing the 2 nd raw material, and continuing ball milling for 6-10h to prepare slurry with the viscosity of 650-980 mpa · s.
In the step (4), injecting the slurry into a die cavity of a die at the pressure of 0.2-0.4MPa, and maintaining the pressure for 1-3 min; then, the grouting pressure is increased to 2.0-2.5MPa and the pressure is maintained for 3-5 min; then the grouting pressure is increased to 3.5-4.0MPa and the pressure is maintained for 8-10 min; and finally, the grouting pressure is increased to 4.5-5.0MPa, the pressure is maintained for 20-30min, and the blank is obtained after demolding.
The mould comprises an inner mould consisting of a plaster mould and an outer mould consisting of a resin mould with micropores, wherein a mould cavity formed by the ceramic cylinder sleeve is arranged in the plaster mould, and the resin mould is coated on the outer side of the plaster mould.
In the step (5), the blank is dried for 24-48h at room temperature, and then dried for 24-48h in an oven at the temperature of 120 ℃ and 180 ℃.
In the step (5), the dried blank is subjected to glue removal in a resistance furnace at the temperature of 600-900 ℃ for 30-40h, and finally sintered in an atmosphere furnace at the temperature of 1400-1450 ℃ for 5-8 h.
The invention has the beneficial effects that: the raw material system is designed by taking zirconium oxide and aluminum oxide as main materials, yttrium oxide and cerium oxide as a zirconium oxide synergistic stabilizer, silicon carbide as a toughening material and titanium dioxide as a sintering aid, and is beneficial to preparing the high-density and high-strength ceramic cylinder sleeve at a lower sintering temperature.
By selecting the auxiliary agents such as the dispersing agent, the binding agent, the reinforcing agent and the like and a multi-time feeding ball milling mode, raw material particles can be fully and uniformly ground, the preparation of fine particle slurry is ensured under the condition that the slurry with high solid content is prepared only by using a small amount of water, and a precondition is provided for preparing a high-density green body by grouting forming. The grouting pressure is gradually increased during grouting forming, so that defects such as air holes and uneven density caused by too fast dehydration and solidification of local slurry due to too high initial grouting pressure can be avoided, and the overall blank has higher density by utilizing final high pressure. The relative density of the formed cylinder liner blank can reach 70-73%, the density is higher than that of the cylinder liner blank formed by CIP (the relative density is usually in the range of 55-65%), the higher blank density means that the average distance among particles in the blank is shorter, the sintering power under the same condition is higher, the densification is easier to realize at a lower sintering temperature, a finished product with finer grain size is obtained, and the reduction of the grain size can greatly improve the strength, the fracture toughness, the wear resistance and the service life of the ceramic cylinder liner.
The selected adhesive can ensure the strength of the green body in the forming process and the low-temperature (room-temperature) drying period, and the selected reinforcing agent can enhance the strength of the green body (in the drying temperature range of 80-150 ℃) along with the rise of the drying temperature, so that the green body is prevented from cracking easily due to uneven stress generated in the drying process, the yield of products is reduced, and the strength of the green body kept in the moving process is improved. The prepared ceramic cylinder sleeve has the relative density of 98.9-99.3%, the bending strength of 1200-1275MPa, the fracture toughness of 10.5-11.8 MPa-m 1/2 and excellent comprehensive performance.
Detailed Description
The following examples are provided to specifically describe embodiments of the present invention.
The method for preparing the ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) taking zirconia, alumina, silicon carbide, yttria, cerium oxide and titanium dioxide as raw materials, and taking a dispersing agent, a binder and a reinforcing agent as auxiliary agents. The weight portions of the raw materials and the addition amount of the auxiliary agent are respectively as follows: 40-60 parts of zirconium oxide, 10-40 parts of aluminum oxide, 15-30 parts of silicon carbide, 5-8 parts of yttrium oxide, 3-5 parts of cerium oxide, 1-3 parts of titanium dioxide, 0.8-2.5 parts of dispersing agent, 1-3 parts of binder and 0.3-0.8 part of reinforcing agent. The components are divided into a plurality of parts by weight for standby.
(2) And (2) weighing water according to the raw materials obtained in the step (1) by taking the prepared slurry with the solid content of 80-85% as a target, wherein the using amount of the water accounts for about 17.6-25% of the total feeding amount. Water, a dispersant, a binder and a reinforcing agent are uniformly stirred and mixed to form a premixed solution.
(3) And (3) placing the premixed liquid prepared in the step (2) into a ball milling tank, then putting the raw materials into the ball milling tank in parts by parts and batches according to the parts of the raw materials, and carrying out ball milling after putting each part of the raw materials. The grinding medium is yttrium-stabilized zirconia, the ball milling tank is a polyurethane or nylon tank, the ball-material ratio is 1:1-2:1, and the rotating speed is stabilized at 200-300 r/m. The ball milling time after each batch of feeding is sequentially prolonged, for example, each raw material is divided into 3 equal parts, the 1 st raw material is directly added into the premixed liquid of the ball milling tank, the rotating speed of the ball milling tank is stabilized at 200-300r/m, and the ball milling is carried out for 1-2 h; keeping the ball milling rotation speed unchanged, adding the 2 nd raw material into a ball milling tank containing the 1 st raw material, continuing ball milling for 3-5h, directly adding the 3 rd batch into the ball milling tank containing the 2 nd raw material, continuing ball milling for 6-10h to prepare slurry with the viscosity of 650-980 mpa · s, and preparing the slurry for later use by ball milling.
(4) And (4) injecting the slurry prepared in the step (3) into a mould, gradually increasing the grouting pressure, maintaining the pressure for a certain time, and demoulding to obtain a blank. The grouting pressure is gradually increased in the grouting process, so that the moisture of the slurry at each part in the mold cavity has sufficient time to gradually flow towards the mold wall to gradually dehydrate, and the defects of uneven internal structure density, air holes and the like caused by too fast dehydration and solidification of the local slurry are prevented.
The used mould comprises an inner mould consisting of a plaster mould and an outer mould consisting of a resin mould with micropores, wherein a mould cavity formed by the ceramic cylinder sleeve is arranged in the plaster mould, and the resin mould is coated on the outer side of the plaster mould. The outside protection frame that still has of mould, the die cavity specification can design as required, and slip casting pressure is provided by the air compressor machine.
The specific method comprises the following steps: pushing the slurry by using compressed air, injecting the slurry into a mold cavity of a mold at the pressure of 0.2-0.4MPa, and maintaining the pressure for 1-3 min; then, the grouting pressure is increased to 2.0-2.5MPa and the pressure is maintained for 3-5 min; then the grouting pressure is increased to 3.5-4.0MPa and the pressure is maintained for 8-10 min; and finally, the grouting pressure is increased to 4.5-5.0MPa, the pressure is maintained for 20-30min, water in the powder slurry is discharged from the inside to the outside through the micropores of the gypsum mold and the micropores of the resin mold respectively (a drainage pipeline is reserved in the resin mold), and the slurry is subjected to pressure maintaining molding and then is demoulded to obtain a blank.
(5) Drying the green body obtained in the step (4) at room temperature for 24-48h, drying the green body in an oven at the temperature of 120-180 ℃, removing glue in a resistance furnace at the temperature of 600-900 ℃ for 30-40h, and finally placing the green body in a ZrO furnace during sintering in an atmosphere furnace2Sintering the material on a synchronous shrinkage liner ring at the temperature of 1400 ℃ and 1450 ℃ for 5-8h to obtain the ceramic cylinder sleeve.
The dispersing agent is ammonium polyacrylate, ammonium citrate, ammonium polycarboxylate or polycarbonate.
The binder is polyvinyl alcohol.
The reinforcing agent is modified starch, tannin extract or cotton fiber.
Example 1
A method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) weighing 40 parts of zirconia, 20 parts of alumina, 30 parts of silicon carbide, 5 parts of yttria, 3 parts of cerium oxide and 2 parts of titanium dioxide according to parts by weight, and evenly dividing into 3 parts by weight for later use.
(2) And preparing a premixed solution according to the target solid content of 80%, wherein 0.8 part of ammonium polyacrylate dispersant, 1 part of polyvinyl alcohol binder, 0.3 part of modified starch reinforcing agent and 25% of water in the total amount of the added powder, adding the auxiliary agent, and mechanically stirring for 5min to uniformly mix the auxiliary agent and the modified starch reinforcing agent.
(3) Directly adding the first part of raw materials into the premixed liquid, placing the premixed liquid into a planetary ball milling tank for ball milling for 1h (a grinding medium is zirconia balls, the ball milling tank is made of polyurethane, the ball-material ratio is 1.5:1, and the rotating speed is 230 r/m), then adding the second part of raw materials into the ball milling tank, continuing ball milling for 3h, finally adding the third part of raw materials into the ball milling tank, and continuing ball milling for 6h to obtain slurry which is suitable for high-pressure slip casting and has the viscosity of 650mpa · s.
(4) And pushing the slurry by compressed air by using a combined pressure grouting system, and pressing the slurry into a cavity in the gypsum internal mold by a 4-step pressurizing method (the first step is to increase the grouting pressure to 0.2MPa and maintain the pressure for 1min, the second step is to increase the pressure to 2.0MPa and maintain the pressure for 3min, the third step is to increase the pressure to 3.5MPa and maintain the pressure for 8min, and the fourth step is to increase the pressure to 4.5MPa and maintain the pressure for 20 min), wherein the water in the slurry is discharged from inside to outside through the gypsum mold micropores and the resin mold micropores respectively. And (5) demolding after pressure maintaining and molding the powder slurry to obtain the cylinder sleeve blank with the required specification.
(5) Drying the formed cylinder sleeve blank for 24 hours at room temperature, and drying the cylinder sleeve blank for 24 hours in a clean oven at 120 ℃ (the relative density of the blank reaches 70% by test); and (3) carrying out glue removal on the dried blank in a resistance furnace at the temperature of 600 ℃ for 30h, and finally sintering the blank in an atmosphere furnace at the temperature of 1400 ℃ for 5h (a synchronous shrinkage liner ring made of ZrO2 is used during sintering), so as to obtain the ceramic cylinder sleeve with the relative density of 98.9%, the bending strength of 1200MPa and the fracture toughness of 10.5 MPa-m 1/2.
Example 2
A method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) weighing 50 parts of zirconia, 25 parts of alumina, 15 parts of silicon carbide, 5 parts of yttria, 3 parts of cerium oxide and 2 parts of titanium dioxide according to parts by weight, and evenly dividing into 3 parts by weight for later use.
(2) And preparing a premixed solution according to the target solid content of 85%, wherein 1.2 parts of ammonium polyacrylate dispersant, 2 parts of polyvinyl alcohol binder, 0.5 part of modified starch reinforcing agent and 17.6% of water in the total amount of the added powder, adding the auxiliary agent, and mechanically stirring for 5min to uniformly mix the auxiliary agent and the modified starch reinforcing agent.
(3) Directly adding the first part of raw materials into the premixed solution, placing the premixed solution into a planetary ball milling tank for ball milling for 2 hours (a grinding medium is zirconia balls, the ball milling tank is made of polyurethane, the ball-material ratio is 2:1, and the rotating speed is 300 r/m), then adding the second part of raw materials into the ball milling tank, and continuing ball milling for 5 hours; and finally, adding the third part of raw materials into a ball milling tank, and continuing ball milling for 9 hours to obtain the slurry with viscosity of 829mpa · s and suitable for high-pressure slip casting.
(4) And pushing the slurry by compressed air by using a combined pressure grouting system, and pressing the slurry into a cavity in the gypsum internal mold by a 4-step pressurizing method (the first step is to increase the grouting pressure to 0.3MPa and maintain the pressure for 2min, the second step is to increase the pressure to 2.2MPa and maintain the pressure for 5min, the third step is to increase the pressure to 3.8MPa and maintain the pressure for 9min, and the fourth step is to increase the pressure to 5MPa and maintain the pressure for 25 min), wherein the water in the slurry is discharged from inside to outside through the gypsum mold micropores and the resin mold micropores respectively. And (5) demolding after pressure maintaining and molding the powder slurry to obtain the cylinder sleeve blank with the required specification.
(5) Drying the formed cylinder sleeve blank for 24 hours at room temperature, and drying the cylinder sleeve blank for 24 hours in a clean oven at 150 ℃ (the relative density of the blank reaches 72.5 percent through testing); removing the gel from the dried blank in a resistance furnace at 800 deg.C for 35h, and sintering in an atmosphere furnace at 1430 deg.C for 6h (ZrO is used during sintering)2Synchronous shrinkage liner ring made of material) to prepare the ceramic cylinder sleeve with the relative density of 99.1 percent, the bending strength of 1220MPa and the fracture toughness of 10.9 MPa.m 1/2.
Example 3
A method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) weighing 45 parts of zirconia, 10 parts of alumina, 20 parts of silicon carbide, 8 parts of yttria, 5 parts of cerium oxide and 3 parts of titanium dioxide according to parts by weight, and evenly dividing into 3 parts by weight for later use.
(2) And preparing a premixed solution according to the target solid content of 85%, wherein 2 parts of ammonium polyacrylate dispersant, 1.5 parts of polyvinyl alcohol binder, 0.6 part of modified starch reinforcing agent and 20% of water in the total amount of the added powder, adding the auxiliary agent, and mechanically stirring for 6min to uniformly mix the auxiliary agent and the modified starch reinforcing agent.
(3) Directly adding the first part of raw materials into the premixed solution, placing the premixed solution into a planetary ball milling tank for ball milling for 1.5 hours (a grinding medium is zirconia balls, the ball milling tank is made of polyurethane, the ball-material ratio is 1:1, and the rotating speed is 200 r/m), supplementing the second part of raw materials into the ball milling tank, and continuing ball milling for 5 hours; and finally, adding the third part of raw materials into a ball milling tank, and continuing ball milling for 10 hours to obtain the slurry with the viscosity of 840mpa & s and suitable for high-pressure slip casting.
(4) And pushing the slurry by compressed air by using a combined pressure grouting system, and pressing the slurry into a cavity in the gypsum internal mold by a 4-step pressurizing method (the first step is to increase the grouting pressure to 0.4MPa and maintain the pressure for 1.5min, the second step is to increase the pressure to 2.5MPa and maintain the pressure for 3.5min, the third step is to increase the pressure to 4MPa and maintain the pressure for 8.5min, and the fourth step is to increase the pressure to 4.8MPa and maintain the pressure for 30 min), wherein the water in the slurry is discharged from inside to outside through the micropores of the gypsum mold and the micropores of the resin mold respectively. And (5) demolding after pressure maintaining and molding the powder slurry to obtain the cylinder sleeve blank with the required specification.
(5) Drying the formed cylinder sleeve blank for 32h at room temperature, and drying the cylinder sleeve blank for 28h in a clean oven at 180 ℃ (the relative density of the blank reaches 73% by testing); the dried green body is degummed in a resistance furnace at 900 ℃ for 30h, and finally sintered in an atmosphere furnace at 1450 ℃ for 6h (ZrO is used during sintering)2Synchronous shrinkage liner ring made of material) to prepare the ceramic cylinder sleeve with the relative density of 99.3 percent, the bending strength of 1275MPa and the fracture toughness of 11.8 MPa-m 1/2.
Example 4
A method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting comprises the following steps:
(1) 60 parts of zirconia, 40 parts of alumina, 30 parts of silicon carbide, 6 parts of yttria, 4 parts of cerium oxide and 2.5 parts of titanium dioxide are weighed according to parts by weight, and are evenly divided into 3 parts by weight for later use.
(2) And preparing a premixed solution according to the target solid content of 85%, wherein 2.5 parts of ammonium polyacrylate dispersant, 3 parts of polyvinyl alcohol binder, 0.8 part of modified starch reinforcing agent and 21% of water in the total amount of the added powder, adding the auxiliary agent, and mechanically stirring for 4min to uniformly mix the auxiliary agent and the modified starch reinforcing agent.
(3) Directly adding the first part of raw materials into the premixed solution, placing the premixed solution into a planetary ball milling tank for ball milling for 1.5h (a grinding medium is zirconia balls, the ball milling tank is made of polyurethane, the ball-material ratio is 1.5:1, and the rotating speed is 300 r/m), supplementing the second part of raw materials into the ball milling tank, and continuing ball milling for 4 h; and finally, adding the third part of raw materials into a ball milling tank, and continuing ball milling for 8 hours to obtain powder slurry with the viscosity of 980mpa · s and suitable for high-pressure slip casting.
(4) And pushing the slurry by compressed air by using a combined pressure grouting system, and pressing the slurry into a cavity in the gypsum internal mold by a 4-step pressurizing method (the first step is to increase the grouting pressure to 0.3MPa and maintain the pressure for 2min, the second step is to increase the pressure to 2.3MPa and maintain the pressure for 4min, the third step is to increase the pressure to 3.5MPa and maintain the pressure for 10min, and the fourth step is to increase the pressure to 4.5MPa and maintain the pressure for 28 min), wherein the water in the slurry is discharged from inside to outside through the gypsum mold micropores and the resin mold micropores respectively. And (5) demolding after pressure maintaining and molding the powder slurry to obtain the cylinder sleeve blank with the required specification.
(5) Drying the formed cylinder sleeve blank for 24 hours at room temperature, and drying the cylinder sleeve blank for 24 hours in a clean oven at 160 ℃ (the relative density of the blank reaches 72 percent through testing); the dried blank is subjected to glue removal for 40h in a resistance furnace at 700 ℃, and finally sintered for 8h in an atmosphere furnace at 1400 ℃ (ZrO is used during sintering)2Synchronous shrinkage liner ring of material) to prepare the ceramic cylinder sleeve with the relative density of 99.1 percent, the bending strength of 1230MPa and the fracture toughness of 10.6 MPa.m 1/2.
Claims (10)
1. A method for preparing a ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting is characterized by comprising the following steps: the method comprises the following steps:
(1) taking zirconium oxide, aluminum oxide, silicon carbide, yttrium oxide, cerium oxide and titanium dioxide as raw materials, and dividing the raw materials into a plurality of parts by weight for later use;
(2) weighing water according to the raw materials obtained in the step (1) by taking slurry with solid content of 80-85% as a target, and uniformly mixing the water, a dispersing agent, a binder and a reinforcing agent to form a premixed solution;
(3) placing the premixed liquid prepared in the step (2) into a ball milling tank, then putting the raw materials into the ball milling tank in parts by parts and batches according to the parts of the raw materials, carrying out ball milling after putting each part of the raw materials, and prolonging the ball milling time of each batch of the raw materials in sequence to prepare slurry for later use;
(4) injecting the slurry prepared in the step (3) into a mold, gradually increasing the grouting pressure, maintaining the pressure for a certain time, and demolding to obtain a blank;
(5) and (4) drying the blank obtained in the step (4), heating for degumming, and sintering in an atmosphere furnace to obtain the ceramic cylinder sleeve.
2. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: the dispersing agent is ammonium polyacrylate, ammonium citrate, ammonium polycarboxylate or polycarbonate.
3. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: the binder is polyvinyl alcohol.
4. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: the reinforcing agent is modified starch, tannin extract or cotton fiber.
5. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to any one of claims 1 to 4, wherein the method comprises the following steps: the weight portions of the added components are respectively: 40-60 parts of zirconium oxide, 10-40 parts of aluminum oxide, 15-30 parts of silicon carbide, 5-8 parts of yttrium oxide, 3-5 parts of cerium oxide, 1-3 parts of titanium dioxide, 0.8-2.5 parts of dispersing agent, 1-3 parts of binder and 0.3-0.8 part of reinforcing agent.
6. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: the raw materials are divided into 3 equal parts, the 1 st part of raw material is directly put into the premixed liquid of a ball milling tank, the rotating speed of the ball milling tank is stabilized at 200-300r/m, and the ball milling is carried out for 1-2 h; keeping the ball milling rotation speed unchanged, adding the 2 nd raw material into a ball milling tank containing the 1 st raw material, continuing ball milling for 3-5h, directly adding the 3 rd batch into the ball milling tank containing the 2 nd raw material, and continuing ball milling for 6-10h to prepare slurry with the viscosity of 650-980 mpa · s.
7. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: in the step (4), injecting the slurry into a die cavity of a die at the pressure of 0.2-0.4MPa, and maintaining the pressure for 1-3 min; then, the grouting pressure is increased to 2.0-2.5MPa and the pressure is maintained for 3-5 min; then the grouting pressure is increased to 3.5-4.0MPa and the pressure is maintained for 8-10 min; and finally, the grouting pressure is increased to 4.5-5.0MPa, the pressure is maintained for 20-30min, and the blank is obtained after demolding.
8. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1 or 7, wherein the method comprises the following steps: the mould comprises an inner mould consisting of a plaster mould and an outer mould consisting of a resin mould with micropores, wherein a mould cavity formed by the ceramic cylinder sleeve is arranged in the plaster mould, and the resin mould is coated on the outer side of the plaster mould.
9. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: in the step (5), the blank is dried for 24-48h at room temperature, and then dried for 24-48h in an oven at the temperature of 120 ℃ and 180 ℃.
10. The method for preparing the ceramic cylinder sleeve for the petroleum drilling by the high-pressure slip casting according to claim 1, wherein the method comprises the following steps: in the step (5), the dried blank is subjected to glue removal in a resistance furnace at the temperature of 600-900 ℃ for 30-40h, and finally sintered in an atmosphere furnace at the temperature of 1400-1450 ℃ for 5-8 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115490501A (en) * | 2022-10-11 | 2022-12-20 | 广西北流市新源瓷业有限责任公司 | High-pressure slip casting process for ceramic blank |
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Application publication date: 20200228 |