Alloy wear-resistant sliding block and preparation and production process

Abstract

The invention discloses an alloy wear-resistant sliding block and a preparation and production process, and belongs to the technical field of alloy sliding blocks. A position hole is formed in an upper base body, and position grooves are formed in the periphery of the position hole. The included angle between the position holes and the vertical axis is 17-35 degrees, an L-shaped pressing block is installed on the outer side of the arc-shaped body, and a curve part and a bevel part are arranged in the side direction of the L-shaped pressing block; the end parts of the curve parts are welded on the longitudinal water beam; and an anti-bending strip is arranged in the multiple groups of curve parts and is welded with the L-shaped pressing block. The alloy comprises the following components in parts by weight: 2 to 3 parts of C, 10 to 15 parts of Fe, 3 to 5 parts of S , 2 to 3 parts of Al, 15 to 19 parts of Cr, 3 to 5 parts of T , 0.3 to 1.5 parts of Nb, 6 to 9 parts of Co, 0.1 to 0.2 part of P and the balance of N and trace residual impurities, wherein REC is set to be equal to (A < l > + S + T + Cr) / 3N + (Nb + T ) / 2 (N + Cr), and REC is larger than or equal to 0.16 and smaller than or equal to 0.31. The technical problems that longitudinal expansive force is generated in the heat-resistant sliding block due to heating, cracks are generated on the surface of the longitudinal water beam under the action of tensile force, and then breakage is caused are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy sliders, and in particular relates to an alloy wear-resistant slider and a preparation and production process. Background Art

[0002] Heating furnace alloy slider is a key component in the heating furnace, mainly used to withstand high temperature and heavy load. Heating furnace alloy slider is usually made of cobalt-based alloy, nickel-based alloy or other high-temperature alloy. These alloys have excellent heat resistance, wear resistance and corrosion resistance, and can maintain stable performance in extremely high temperature and harsh environment. For example, the alloy slider:

[0003] 1. Cobalt-based alloy sliders: Cobalt-based alloy sliders have good mechanical properties and corrosion resistance, moderate hardness and good toughness, and are particularly suitable for working conditions that withstand large shock waves at high temperatures. For example, Co20 cobalt-based alloy sliders have excellent high temperature resistance, high strength and good oxidation resistance, which can significantly improve the high temperature wear resistance of the equipment and extend the service life of the equipment.

[0004] 2. Nickel-based alloy slider: Nickel-based alloy slider also has high heat resistance and wear resistance, suitable for various high temperature environments. Its advantages include good thermal stability, creep resistance and fatigue resistance.

[0005] The heat-resistant slider is an important part of the heating furnace. It is located on the water beam inside the furnace and plays an important role in the transportation of billets in the furnace. In the prior art, the slider has a low hardness and is not wear-resistant, which causes the slider to gradually become lower in long-term use, resulting in serious black marks on parts of the billet and eventually failure.

[0006] In view of this defect, reference document CN103725865A discloses a slider for a steel rolling heating furnace and a production method thereof, wherein the upper and lower parts of the slider are precision cast respectively, the upper part is made of a high heat-resistant alloy, and the lower part is made of a low heat-resistant alloy, a high-temperature resistant heat-insulating coating is applied on the top of the fishtail-type component, and after the coating is dried, the upper and lower parts are clamped, welded, and shot blasted;

[0007] The current problem is: after the heating furnace heats the steel billet, the temperature of the steel billet is relatively high, and part of the heat will be conducted to the slider through the steel billet, causing a longitudinal expansion force inside the heat-resistant slider. The longitudinal water beam is subjected to tension, causing cracks on the surface and leading to fracture.

[0008] Therefore, in order to solve the above problems, a preparation and production process of an alloy wear-resistant sliding block is proposed. Summary of the invention

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An alloy wear-resistant sliding block comprises an upper base and an arc-shaped body, wherein the upper base and the arc-shaped body are integrally connected, and the arc-shaped body is suitable for being connected to a longitudinal water beam at the bottom;

[0011] A position hole is provided on the upper base body, and the position hole passes through the upper base body; and position grooves are provided around the position hole, and the position grooves are adapted to the position hole;

[0012] The position holes are provided in four groups and the angle between them and the vertical axis is 17-35°. An L-shaped pressing block is installed on the outside of the arc-shaped body, and the side of the L-shaped pressing block is provided with a curved portion and an angled portion; the curved portion is provided in multiple groups, and the end portion is welded on the longitudinal water beam;

[0013] Anti-bending strips are installed in the multiple curved parts, and the tops of the anti-bending strips are welded to the L-shaped pressing blocks;

[0014] The angled portion is suitable for segmentally fixedly connecting the arc-shaped body;

[0015] The components of the alloy wear-resistant slider include:

[0016] C: 2.0-3.0 parts, Fe: 10-15 parts, Si: 3.2-5.2 parts, Al: 2.4-3.2 parts, Cr: 15-19 parts, Ti: 3.0-5.0 parts, Nb: 0.3-1.5 parts, Co: 6.0-9.0 parts, P: 0.1-0.2 parts, and the balance is Ni and trace residual impurities; wherein, REC=(Al+S i+Ti+Cr) / 3Ni+(Nb+T i) / 2(Ni+Cr), and 0.16≤REC≤0.31.

[0017] Among them, the position hole is set to reduce the vertical stretching caused by vertical thermal stress and avoid thermal deformation, which may cause deformation of the contact position between the heat-resistant alloy slider and the longitudinal water beam and cause water leakage.

[0018] The alloy substrate of the present application is a nickel-chromium alloy. A high content of Ni improves the stability of the face-centered cubic γ phase of the matrix and improves the tendency of the heat-resistant alloy to precipitate various harmful phases, so that it can improve the strength of the steel while maintaining good plasticity and toughness. Nickel has a high corrosion resistance to acids and alkalis, and has rust prevention and heat resistance at high temperatures. The heat-resistant alloy is added with the solid solution element Cr, so that the heat-resistant alloy has a multi-element solid solution strengthening effect and improves the use temperature of the slider; Co is added to ensure the high-temperature creep strength of the heat-resistant alloy; an appropriate amount of Si and Al are added to help increase the fluidity of the heat-resistant alloy and serve as a deoxidizer. Nickel elements easily form nickel oxide with oxygen elements at high temperatures, and pores are easily generated during crystallization. In order to avoid a large number of pores remaining, which causes the connection parts to fall off easily, Si and Al are added; among them, Al, Si, Ti, and Cr are all oxygen-absorbing elements, and Si is easy to produce compounds such as silicates, which affects the performance of the alloy; Ti is easy to absorb oxygen and hydrogen during the alloy preparation process to form an oxide layer. The grains in high-temperature alloys tend to grow under high temperature conditions, resulting in unstable grain boundaries, easy formation of pores and cracks, and thus reducing the mechanical properties of the material. The addition of titanium can combine with impurity elements at the grain boundaries to form stable compounds, thereby inhibiting the growth of grains and stabilizing the grain boundary structure. The stability of this microstructure helps to improve the mechanical properties and heat resistance of the alloy. Cr and Al can also react with oxygen in the alloy to form an oxide protective film, thereby enhancing the corrosion resistance of the alloy. In actual operation, it is possible to consider reducing the oxygen content by introducing nitrogen. Therefore, it is necessary to control the proportion of oxygen-absorbing elements in heat-resistant alloys. Too high a content will lead to a decrease in performance. For example, Si exceeding 4% will lead to increased brittleness.

[0019] Adding an appropriate amount of C can form skeleton carbides and eutectic carbides, which has a positive effect on improving the high-temperature strength of the heat-resistant alloy; adding P and Nb can refine the crystal particle size, enhance its strength and wear resistance, and control the P content to avoid affecting the high-temperature durability of the heat-resistant alloy; Nb element can form a stable γ' strengthening phase, and the segregation of Nb element in the alloy will affect the organizational differences inside the grains. Furthermore, the refining ability of Nb and Ti is based on their proportion content, which needs to be controlled to avoid cracks and precipitation phase morphology. The addition of Nb forms a nano-scale carbide second phase inside the coating, which significantly reduces the overheating sensitivity of the coating, refines the grains, and forms a variety of metal compound phases, such as NbCo2, NbCo5 and other series of compounds; during the solidification process of the alloy, the series of compound phases can serve as the core of non-uniform nucleation, promote the nucleation and growth of grains, thereby obtaining fine grains, and refine the grains by hindering the growth of grains and inhibiting the movement of grain boundaries, so that the metal compound has high strength, high hardness, good corrosion resistance and high temperature stability.

[0020] In a further technical solution, the curved portion is "L"-shaped, and the top is connected to the L-shaped pressing block; the bottom of the curved portion is welded to the longitudinal water beam.

[0021] In a further technical solution, the anti-bending strip includes an arc bottom surface, working surface one and working surface two, the arc bottom surface is suitable for abutting the bottom on the longitudinal water beam; the working surface one is arranged perpendicular to the L-shaped pressure block, and the working surface two is suitable for abutting the bottom side of the corresponding curved portion.

[0022] In a further technical solution, a bevel surface is also provided in the middle of the anti-bending strip, and the bottom end of the bevel surface is suitable for welding on the longitudinal water beam.

[0023] In a further technical solution, a composite ceramic piece is installed in the position hole, and the composite ceramic piece is provided with four corners and extends into the position slot;

[0024] The component materials of the composite ceramic part include, by weight, 76 to 82 parts of Al2O3, 1 to 5 parts of TiC, 1 to 8 parts of TiO, 1 to 5 parts of Si, and the balance is ceramic fiber.

[0025] In a further technical solution, the composite ceramic part includes a middle cylinder portion, and an inner cylinder is arranged inside, and a filling portion is arranged between the inner cylinder and the middle cylinder portion, and the filling portion is ceramic fiber;

[0026] An edge sealing ring is arranged at the end of the middle cylinder, and the length of the inner cylinder is smaller than the length of the middle cylinder.

[0027] A preparation and production process of an alloy wear-resistant slider comprises the following steps:

[0028] Step 1, melting the raw material containing the heat-resistant alloy component in a nitrogen-protected resistance furnace, casting to obtain a casting, and subjecting the casting to a solid solution molding process to obtain an alloy wear-resistant slider;

[0029] Step 2, solution treatment:

[0030] The method comprises the first step of solid solution treatment, the second step of solid solution treatment and the third step of solid solution treatment. The first step of solid solution treatment comprises: heating the temperature to 280-340°C and keeping the temperature for 4-12 hours; the second step of solid solution treatment, the third step of solid solution treatment and the fourth step of solid solution treatment all comprise: heating the temperature to 400-460°C and keeping the temperature for 12-14 hours, cooling the furnace to 300-320°C and then quenching the temperature to 23-28°C after taking out of the furnace;

[0031] Step 3, granulating, pressing, drying and sintering the raw materials containing the components of the composite ceramic component to obtain the composite ceramic component, the pressing pressure is 250 MPa, the holding time is 30s-50s; the sintering temperature is 1250-1440°C;

[0032] Step 4: assemble and install the composite ceramic part in the position hole, and install heat-resistant bolts to strengthen and fix the composite ceramic part in the alloy wear-resistant slider;

[0033] Step 5, welding the alloy wear-resistant slider on the longitudinal water beam, using a current of 160A for welding, using standard welding rods to weld on the longitudinal water beam from both ends, and using fish pattern welding;

[0034] Step 6, cutting or prefabricating the anti-bending strip, processing the working surface 1 and the working surface 2 on the anti-bending strip, and inserting them into the curved part after welding;

[0035] Step 7, reduce the welding current to 130A, use a thin electrode, and weld an oblique circular line to avoid overheating of the heat-affected zone of the joint and grain growth; swing appropriately during the welding process to overcome the poor fluidity of the liquid nickel alloy and reduce the probability of incomplete fusion and porosity defects. The amplitude of the swing cannot be greater than 2 times the diameter of the electrode;

[0036] Step 8: Weld the bevel surface on the longitudinal water beam at a welding angle of 30°. After welding, polish the two sides within 20 mm to a metallic luster;

[0037] Step 9, control the interlayer temperature and hammer the weld; the multi-layer and multi-pass welds on both sides should be welded in sequence, and the interlayer temperature should be controlled to be less than 100°C during welding; the layers of the multi-layer and multi-pass welds should overlap each other by 1 / 3 of the welds; after welding, the weld and heat-affected zone should be moderately hammered to relax the excessive concentration of stress.

[0038] In a further technical solution, in step 7, the curved portion and the longitudinal water beam are welded in sequence; and then the angled portion is welded to the arc body; all are welded in sections and the welding temperature difference is not greater than 100°C.

[0039] Beneficial Effects

[0040] The alloy substrate of the present application is a nickel-chromium alloy. A high content of Ni improves the stability of the face-centered cubic γ phase of the matrix and improves the tendency of the heat-resistant alloy to precipitate various harmful phases, so that it can improve the strength of the steel while maintaining good plasticity and toughness. Nickel has a high corrosion resistance to acids and alkalis, and has rust prevention and heat resistance at high temperatures. The heat-resistant alloy is added with the solid solution element Cr, so that the heat-resistant alloy has a multi-element solid solution strengthening effect and improves the use temperature of the slider; Co is added to ensure the high-temperature creep strength of the heat-resistant alloy; an appropriate amount of Si and Al are added to help increase the fluidity of the heat-resistant alloy and serve as a deoxidizer. Nickel elements easily form nickel oxide with oxygen elements at high temperatures, and pores are easily generated during crystallization. In order to avoid a large number of pores remaining, which causes the connection parts to fall off easily, Si and Al are added; among them, Al, Si, Ti, and Cr are all oxygen-absorbing elements, and Si is easy to produce compounds such as silicates, which affects the performance of the alloy; Ti is easy to absorb oxygen and hydrogen during the alloy preparation process to form an oxide layer. The grains in high-temperature alloys tend to grow under high temperature conditions, resulting in unstable grain boundaries, easy formation of pores and cracks, and thus reducing the mechanical properties of the material. The addition of titanium can combine with impurity elements at the grain boundaries to form stable compounds, thereby inhibiting the growth of grains and stabilizing the grain boundary structure. The stability of this microstructure helps to improve the mechanical properties and heat resistance of the alloy. Cr and Al can also react with oxygen in the alloy to form an oxide protective film, thereby enhancing the corrosion resistance of the alloy. In actual operation, it is possible to consider reducing the oxygen content by introducing nitrogen. Therefore, it is necessary to control the proportion of oxygen-absorbing elements in heat-resistant alloys. Too high a content will lead to a decrease in performance. For example, Si exceeding 4% will lead to increased brittleness.

[0041] Adding an appropriate amount of C can form skeleton carbides and eutectic carbides, which has a positive effect on improving the high-temperature strength of the heat-resistant alloy; adding P and Nb can refine the crystal particle size, enhance its strength and wear resistance, and control the P content to avoid affecting the high-temperature durability of the heat-resistant alloy; Nb element can form a stable γ' strengthening phase, and the segregation of Nb element in the alloy will affect the organizational differences inside the grains. Furthermore, the refining ability of Nb and Ti is based on their proportion content, which needs to be controlled to avoid cracks and precipitation phase morphology.

[0042] Position holes are set in the heat-resistant alloy slider and a composite ceramic structure is installed to improve the oxidation, softening, creep and other phenomena of the existing heat-resistant alloy, which leads to a decrease in its mechanical properties. The longitudinal expansion force generated inside the heat-resistant slider is further reduced, and the longitudinal water beam is subjected to tension to cause cracks on the surface, which leads to fracture and leakage. Therefore, the high thermal shock resistance and high melting point of the composite ceramic part relative to the heat-resistant alloy can effectively maintain the strength and toughness of the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a structural diagram of the alloy wear-resistant slider installation of the present invention;

[0045] Figure 2 for Figure 1 A magnified view of part A;

[0046] Figure 3 for Figure 1 A magnified view of part B;

[0047] Figure 4 It is a side view schematic diagram of the anti-bending strip of the present invention on the curved portion;

[0048] Figure 5 is a cross-sectional view of the composite ceramic member of the present invention;

[0049] In the figure: 1. upper base; 2. arc-shaped body; 3. longitudinal water beam; 4. position hole; 5. position groove; 6. L-shaped pressure block; 7. curved part; 8. corner part; 9. anti-bending strip; 91. arc bottom surface; 92. working surface one; 93. working surface two; 94. bevel surface; 10. composite ceramic part; 101. middle cylinder part; 102. built-in cylinder; 103. filling part; 104. edge sealing ring. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] See also Figure 1-5As shown, it is an implementation scheme of the present invention, which provides an alloy wear-resistant sliding block, including an upper substrate 1 and an arc-shaped body 2, the upper substrate 1 is integrally connected with the arc-shaped body 2, and the arc-shaped body 2 is suitable for connecting to the longitudinal water beam 3 at the bottom; a position hole 4 is opened on the upper substrate 1, and the position hole 4 runs through the upper substrate 1; and position grooves 5 are arranged around the position hole 4, and the position grooves 5 are adapted to the position hole 4; the position holes 4 are arranged in four groups, and the angles with the vertical axis are 17-35°, an L-shaped pressing block 6 is installed on the outer side of the arc-shaped body 2, and the side of the L-shaped pressing block 6 is arranged with a curved portion 7 and an angled portion 8; there are multiple groups of curved portions 7, and the ends are welded to the longitudinal water beam 3; anti-bending strips 9 are installed in the multiple groups of curved portions 7, and the tops of the anti-bending strips 9 are welded to the L-shaped pressing block 6; the angled portion 8 is suitable for segmented fixed connection with the arc-shaped body 2;

[0054] The curved portion 7 is "L"-shaped, and the top is connected to the L-shaped pressure block 6; the bottom of the curved portion 7 is welded to the longitudinal water beam 3. The anti-bending strip 9 includes an arc bottom surface 91, a working surface 1 92 and a working surface 2 93, and the arc bottom surface 91 is suitable for the bottom to abut against the longitudinal water beam 3; the working surface 1 92 is arranged perpendicular to the L-shaped pressure block 6, and the working surface 2 93 is suitable for abutting against the bottom side of the corresponding curved portion 7. An angled surface 94 is also provided in the middle of the anti-bending strip 9, and the bottom end of the angled surface 94 is suitable for welding to the longitudinal water beam 3. A composite ceramic component 10 is installed in the position hole 4, and the composite ceramic component 10 is provided with four corners and extends into the position groove 5;

[0055] The composite ceramic part 10 comprises a middle cylinder part 101, and an inner cylinder 102 is arranged inside the middle cylinder part 101, and a filling part 103 is arranged between the inner cylinder 102 and the middle cylinder part 101, and the filling part 103 is ceramic fiber;

[0056] The end of the middle cylinder 101 is provided with an edge sealing ring 104, and the length of the inner cylinder 102 is less than the length of the middle cylinder 101. This embodiment adopts a position groove with an angle in the heat-resistant alloy slider to reduce the deformation caused by thermal stress. Among them, although the position hole is set in the heat-resistant alloy slider and the composite ceramic structure is installed, although it will cause the thermal resistance of the slider to increase, it is compared with the loss of high temperature performance of the heat-resistant alloy. For example, at high temperature, the heat-resistant alloy may oxidize, soften, creep and other phenomena, resulting in a decrease in its mechanical properties. Although the high temperature performance of the alloy can be significantly improved by adding specific alloy elements and optimizing the heat treatment process. However, thermal deformation occurs, causing a longitudinal expansion force to be generated inside the heat-resistant slider, and the longitudinal water beam is subjected to tension to cause cracks on the surface and then break, resulting in a leak. Therefore, the strength and toughness of the slider can be effectively maintained by the high thermal shock resistance and high melting point of the composite ceramic relative to the heat-resistant alloy.

[0057] Furthermore, this embodiment reduces the adverse effects of welding thermal stress on the longitudinal water beam during the installation and manufacturing process by providing a staged thermal welding technology at the connection between the alloy slider and the longitudinal water beam. A curved portion 1 is provided, and anti-bending strips are provided and connected in sections to perform a multi-angle welding process and avoid the effects of anti-bending and torsion, thereby strengthening the welding strength of the arc surface and the total water volume, and reducing the probability of water leakage caused by warping at the welding point between the arc surface and the longitudinal water beam caused by thermal stress.

[0058] The components of the alloy wear-resistant slider include:

[0059] C: 2-3 parts, Fe: 10-15 parts, Si: 3-5 parts, Al: 2-3 parts, Cr: 15-19 parts, Ti: 3-5 parts, Nb: 0.3-1.5 parts, Co: 6-9 parts, P: 0.1-0.2 parts, and the balance is Ni and trace residual impurities; wherein, REC is set to (Al+Si+Ti+Cr) / 3Ni+(Nb+Ti) / 2(Ni+Cr), and 0.16≤REC≤0.31.

[0060] Example 2

[0061] Based on Example 1, the component materials of the alloy wear-resistant slider are measured by weight, including:

[0062] C: 2 parts, Fe: 10 parts, Si: 3 parts, Al: 2 parts, Cr: 19 parts, Ti: 3 parts, Nb: 0.3 parts, Co: 6 parts, P: 0.1 parts, the balance is Ni and trace residual impurities; (Al+Si+Ti+Cr) / 3Ni=0.14, (Nb+Ti) / 2(Ni+Cr)=0.022, REC=0.162. In this embodiment, the Cr content is increased and the content of other elements is reduced.

[0063] Example 3

[0064] Based on Example 1, the component materials of the alloy wear-resistant slider are measured by weight, including:

[0065] C: 2 parts, Fe: 10 parts, Si: 5 parts, Al: 3 parts, Cr: 15 parts, Ti: 5 parts, Nb: 1.5 parts, Co: 6 parts, P: 0.1 parts, the balance is Ni and trace residual impurities; where (Al+Si+Ti+Cr) / 3Ni=0.178, (Nb+Ti) / 2(Ni+Cr)=0.048, REC=0.226. In this embodiment, the content of Si, Al, Ti and Nb elements is increased.

[0066] Example 4

[0067] Based on Example 1, the component materials of the alloy wear-resistant slider are measured by weight, including:

[0068] C: 2 parts, Fe: 15 parts, Si: 5 parts, Al: 3 parts, Cr: 15 parts, Ti: 3 parts, Nb: 0.3 parts, Co: 9 parts, P: 0.1 parts, the balance is Ni and trace residual impurities; (Al+Si+Ti+Cr) / 3Ni=0.182, (Nb+Ti) / 2(Ni+Cr)=0.026, REC=0.208. In this embodiment, the contents of Fe, Co, Si and Al are increased.

[0069]

[0070] The melting point temperature, strength and hardness of the three groups were tested. The hardness test was a Vickers hardness test, in which a square pyramid made of diamond was used as an indenter. A certain test force was pressed into the surface of the sample, and the length of the diagonal of the indentation was measured, and the hardness value was calculated accordingly. The test was carried out to ensure that the loading speed, holding time and unloading method during the test met the standards. The samples were taken as alloy metal blocks of equal size, and the diagonal length of the indentation was measured by being pressed, and the hardness value was calculated according to the formula.

[0071] Strength refers to the maximum tensile stress that an alloy material can withstand without breaking in a high-temperature tensile strength test. The ultimate strength of the fracture in the high-temperature tensile strength at 700°C is used.

[0072]

[0073] Si and Al are added; among them, Al, Si, Ti, and Cr are all oxygen-absorbing elements, Si is easy to produce compounds such as silicates, which affect the properties of the alloy; Ti is easy to absorb oxygen and hydrogen during the alloy preparation process to form an oxide layer. It can be seen from Example 2 that the strength and hardness are enhanced, and titanium oxide, aluminum oxide and silicates enhance the melting point temperature.

[0074] The components of the composite ceramic part 10 are measured by weight, including: Al2O3: 76-82 parts, TiC: 1-5 parts, TiO: 1-8 parts, Si: 1-5 parts, and the balance is ceramic fiber. The composite ceramic part of the present application is added with appropriate amounts of TiC, TiO, and BO, so that the composite ceramic part has good strength and toughness, and improves the high temperature resistance and wear resistance of the composite ceramic part. The addition of an appropriate amount of Si reduces the apparent porosity of the composite ceramic part, improves the room temperature strength, high temperature strength, and improves thermal shock resistance.

[0075] A preparation and production process of an alloy wear-resistant slider comprises the following steps:

[0076] Step 1, melting the raw material containing the heat-resistant alloy component in a nitrogen-protected resistance furnace, casting to obtain a casting, and subjecting the casting to a solid solution molding process to obtain an alloy wear-resistant slider;

[0077] Step 2, solution treatment:

[0078] The method comprises the first step of solid solution treatment, the second step of solid solution treatment and the third step of solid solution treatment. The first step of solid solution treatment comprises: heating the temperature to 280-340°C and keeping the temperature for 4-12 hours; the second step of solid solution treatment, the third step of solid solution treatment and the fourth step of solid solution treatment all comprise: heating the temperature to 400-460°C and keeping the temperature for 12-14 hours, cooling the furnace to 300-320°C and then quenching the temperature to 23-28°C after taking out of the furnace;

[0079] Step 3, granulating, pressing, drying and sintering the raw materials containing the components of the composite ceramic part 10 to obtain the composite ceramic part 10, the pressing pressure is 250 MPa, the holding time is 30s-50s; the sintering temperature is 1250-1440°C;

[0080] Step 4: assemble and install the composite ceramic part 10 in the position hole 4, and install heat-resistant bolts to strengthen and fix the composite ceramic part 10 in the alloy wear-resistant slider;

[0081] Step 5, welding the alloy wear-resistant slider on the longitudinal water beam 3, using a current of 160A for welding, using standard welding rods to weld on the longitudinal water beam 3 from both ends, and using fish pattern welding;

[0082] Step 6, cutting or prefabricating the anti-bending strip 9, processing a working surface 1 92 and a working surface 2 93 on the anti-bending strip 9, and inserting the anti-bending strip 9 into the curved portion 7 after welding;

[0083] Step 7, reduce the welding current to 130A, use a thin electrode, and weld the oblique circular line to avoid overheating and grain growth in the heat affected zone of the joint; swing appropriately during the welding process to overcome the poor fluidity of the liquid nickel alloy and reduce the probability of unfused and porosity defects. The amplitude of the swing cannot be greater than twice the diameter of the electrode; weld the curved portion 7 and the longitudinal water beam 3 in turn; and then weld to the arc body 2 through the angled portion 8; all are segmented welding and the welding temperature difference is not greater than 100°C.

[0084] Step 8, welding the bevel surface 94 on the longitudinal water beam 3, the welding angle is 30°, and after welding, the two sides within 20 mm are polished to a metallic luster;

[0085] Step 9, control the interlayer temperature and hammer the weld; the multi-layer and multi-pass welds on both sides should be welded in sequence, and the interlayer temperature should be controlled to be less than 100°C during welding; the layers of the multi-layer and multi-pass welds should overlap each other by 1 / 3 of the welds; after welding, the weld and heat-affected zone should be moderately hammered to relax the excessive concentration of stress.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0087] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An alloy wear-resistant sliding block, comprising an upper base (1) and an arc-shaped body (2), wherein the upper base (1) and the arc-shaped body (2) are integrally connected, and the arc-shaped body (2) is suitable for being connected to a longitudinal water beam (3) at the bottom; It is characterized in that A position hole (4) is provided on the upper base body (1), and the position hole (4) passes through the upper base body (1); and position grooves (5) are provided around the position hole (4); The position holes (4) are provided in four groups and the angle between them and the vertical axis is 17-35 degrees. An L-shaped pressing block (6) is provided on the outer side of the arc-shaped body (2), and a curved portion (7) and an angled portion (8) are provided on the side of the L-shaped pressing block (6); the curved portion (7) is provided in multiple groups, and the ends are welded to the longitudinal water beam (3); Anti-bending strips (9) are installed in the multiple groups of curved portions (7), and the tops of the anti-bending strips (9) are welded to the L-shaped pressing blocks (6); The angled portion (8) is suitable for fixedly connecting the arc-shaped body (2) in sections; The components of the alloy wear-resistant slider include: C: 2.0-3.0 parts, Fe: 10-15 parts, Si: 3.2-5.2 parts, Al: 2.4-3.2 parts, Cr: 15-19 parts, Ti: 3.0-5.0 parts, Nb: 0.3-1.5 parts, Co: 6.0-9.0 parts, P: 0.1-0.2 parts, and the remainder is Ni and trace residual impurities; wherein, REC=(Al+Si+Ti+Cr) / 3Ni+(Nb+Ti) / 2(Ni+Cr), and 0.16≤REC≤0.

31.

2. The wear-resistant alloy slider according to claim 1, characterized in that: The curved portion (7) is L-shaped, and the top is connected to the L-shaped pressing block (6); the bottom of the curved portion (7) is welded to the longitudinal water beam (3).

3. The wear-resistant alloy slider according to claim 2, characterized in that: The anti-bending strip (9) comprises an arc bottom surface (91), a first working surface (92) and a second working surface (93); the arc bottom surface (91) is suitable for abutting against the longitudinal water beam (3); the first working surface (92) is arranged perpendicular to the L-shaped pressure block (6), and the second working surface (93) is suitable for abutting against the bottom side of the corresponding curved portion (7).

4. The wear-resistant alloy slider according to claim 2, characterized in that: The middle portion of the anti-bending strip (9) is also provided with an angled surface (94), and the bottom end of the angled surface (94) is suitable for being welded to the longitudinal water beam (3).

5. The wear-resistant alloy slider according to claim 4, characterized in that: A composite ceramic piece (10) is installed in the position hole (4), and the composite ceramic piece (10) is provided with four corners and extends into the position slot (5); The component materials of the composite ceramic part (10) include, by weight, 76 to 82 parts of Al2O3, 1 to 5 parts of TiC, 1 to 8 parts of TiO, 1 to 5 parts of Si, and the balance being ceramic fibers.

6. The wear-resistant alloy slider according to claim 4, characterized in that: The composite ceramic part (10) comprises a middle cylinder part (101), and an inner cylinder (102) is arranged inside the middle cylinder part; a filling part (103) is arranged between the inner cylinder (102) and the middle cylinder part (101); the filling part (103) is ceramic fiber; An edge sealing ring (104) is provided at the end of the middle cylinder (101), and the length of the inner cylinder (102) is smaller than the length of the middle cylinder (101).

7. A production process for the alloy wear-resistant slider according to claim 6, characterized in that: The following steps are involved: Step 1, melting the raw material containing the heat-resistant alloy component in a nitrogen-protected resistance furnace, casting to obtain a casting, and subjecting the casting to a solid solution molding process to obtain an alloy wear-resistant slider; Step 2, solution treatment: The method comprises the first step of solid solution treatment, the second step of solid solution treatment and the third step of solid solution treatment. The first step of solid solution treatment comprises: heating the temperature to 280-340°C and keeping the temperature for 4-12 hours; the second step of solid solution treatment, the third step of solid solution treatment and the fourth step of solid solution treatment all comprise: heating the temperature to 400-460°C and keeping the temperature for 12-14 hours, cooling the furnace to 300-320°C and then quenching the temperature to 23-28°C after taking out of the furnace; Step 3, granulating, pressing, drying and sintering the raw materials containing the components of the composite ceramic part (10) to obtain the composite ceramic part (10), the pressing pressure is 250 MPa, the holding time is 30 s-50 s; the sintering temperature is 1250-1440° C.; Step 4, assembling and installing the composite ceramic part (10) in the position hole (4), and installing heat-resistant bolts to strengthen and fix the composite ceramic part (10) in the alloy wear-resistant slider; Step 5, welding the alloy wear-resistant slider to the longitudinal water beam (3), using a current of 160A for welding, using standard welding rods to weld to the longitudinal water beam (3) from both ends, and using fish pattern welding; Step 6, cutting or prefabricating the anti-bending strip (9), processing the first working surface (92) and the second working surface (93) on the anti-bending strip (9), and inserting them into the curved portion (7) after welding; Step 7, reduce the welding current to 130A, use a thin electrode, and weld an oblique circular line to avoid overheating of the heat-affected zone of the joint and grain growth; swing appropriately during the welding process to overcome the poor fluidity of the liquid nickel alloy and reduce the probability of incomplete fusion and porosity defects. The amplitude of the swing cannot be greater than 2 times the diameter of the electrode; Step 8, welding the bevel surface (94) on the longitudinal water beam (3), the welding angle is 30°, and after welding, the two sides within 20 mm are polished to a metallic luster; Step 9, control the interlayer temperature and hammer the weld; the multi-layer and multi-pass welds on both sides should be welded in sequence, and the interlayer temperature should be controlled to be less than 100°C during welding; the layers of the multi-layer and multi-pass welds should overlap each other by 1 / 3 of the welds; after welding, the weld and heat-affected zone should be moderately hammered to relax the excessive concentration of stress.

8. The manufacturing process of a wear-resistant alloy slider according to claim 7, characterized in that: In step 7, the curved portion (7) and the longitudinal water beam (3) are welded in sequence; and then the curved portion (8) is welded to the arc body (2); all welding is performed in sections and the welding temperature difference is not greater than 100°C.

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