Low-cost light ablation-resistant high-performance cuttable heatproof sleeve

Abstract

The utility model belongs to the technical field of composite materials, and particularly relates to a low-cost light ablation-resistant high-performance cuttable heat-proof sleeve which comprises a cylindrical prefabricated body, the prefabricated body is formed by stacking a plurality of quartz net tires and a plurality of high-silica cloths from inside to outside and connecting the quartz net tires and the high-silica cloths through needling, two layers of high-silica cloths are arranged between every two adjacent quartz net tires, and the two layers of high-silica cloths are connected through needling. The high silica cloth on the outer layer of the two layers is laid relative to the high silica cloth on the inner layer in a rotating mode, a resin matrix is formed on the prefabricated body in a curing mode through the RTM technology, and the detonating cord cutting cabin opening experiment device is light, resistant to ablation, good in heat insulation performance, large in specific heat capacity, low in heat conductivity coefficient and good in detonating cord cutting cabin opening experiment effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite materials, and in particular relates to a low-cost, light-weight, ablation-resistant, high-performance, cuttable heat-resistant sleeve. Background Art

[0002] Aircraft are facing the development trend of fast flight speed and long flight distance. At the same time, they need to cope with thermal environments with characteristics such as high heat flux, high enthalpy value, and high stagnation pressure. Therefore, the external thermal protection materials of aircraft need to have low density, large specific heat capacity, low thermal conductivity, anti-ablation, and anti-erosion.

[0003] The thermal protection materials currently used in aircraft include external thermal protection materials and internal thermal insulation materials. The external thermal protection materials include carbon-carbon composites, silicon carbide ceramic-based composites and rubber. However, carbon materials undergo oxidation reactions in an oxygen-rich environment, and their performance drops rapidly. In addition, the material preparation cost is relatively high. In order to ensure the characteristics of ablation resistance and erosion resistance, rubber thermal protection materials have a large material density and a high thermal conductivity. They cannot effectively guarantee the precise guidance of missiles, and when the submunitions are opened, they will be connected and affect the strike effect. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-proof sleeve, which is lightweight, ablation-resistant, has good heat insulation performance, large specific heat capacity, low thermal conductivity, and good results in the detonating cord cutting and cabin opening experiment.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve, comprising a cylindrical preform, wherein the preform is formed by stacking a plurality of quartz mesh tires and a plurality of high-silica cloths from the inside to the outside and connecting them by needle puncture, wherein the high-silica cloths between the adjacent quartz mesh tires are two layers, and the high-silica cloths of the outer layer of the two layers are rotated by - degrees relative to the high-silica cloths of the inner layer, and a resin matrix is ​​formed on the preform by curing through an RTM process;

[0006] The resin is ablation-resistant phenolic resin with a solid content of 30-50%, a viscosity of 5-20 mP·s, a curing temperature of 80-100° C., a heat preservation time of 1000-2000 min, and a heating rate of 0.5-2° C. / min.

[0007] As a preferred technical solution for a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve of the utility model, the upper inner diameter of the preform is 50-800mm, the bottom inner diameter is 100-1000mm, the thickness is 5-50mm, and the height is 500-2000mm.

[0008] As a preferred technical solution for a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve of the utility model, the quartz mesh surface density is 40-180g / m2, and the high silica cloth surface density is 40-180g / m2.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. The utility model is formed by needle-punching a quartz mesh and a high-silica cloth, the preparation method is simple, the density is controllable, and the normal reinforcement effect of the needle-punching greatly improves the interlayer shear strength.

[0011] 2. The resin selected by the utility model is a high-performance ablation-resistant phenolic resin with a low solid content. After molding, the density is reduced while meeting the ablation requirements, thereby reducing energy loss during flight.

[0012] 3. The utility model adopts vacuum-assisted RTM process to impregnate and co-curing the preform, and the inner and outer steel molds realize the net size forming of the inner and outer surfaces. The outer surface does not need to be processed, which reduces the processing cost and improves the ablation performance.

[0013] 4. The utility model is composed of a low-density homogeneous preform and a high-performance ablation-resistant phenolic resin. When the detonating cord is cut to open the compartment, there will be no energy attenuation, thereby ensuring the smooth opening of the missile warhead compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a partial cross-sectional schematic diagram of the utility model;

[0017] Figure 3 This is an experimental data diagram of the present utility model.

[0018] In the picture: 1. Quartz mesh; 2. High silica cloth. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example

[0021] See also Figure 1-3 , the utility model provides the following technical solutions: a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve, comprising a low-density homogeneous preform and a high-performance ablation-resistant phenolic resin, wherein;

[0022] The low-density homogeneous preform is a cylindrical structure, the inner diameter of the upper end, i.e. the smallest end, of the preform is 50-800mm, the inner diameter of the bottom end, i.e. the largest end, is 100-1000mm, the thickness is 5-50mm, and the height is 500-2000mm. The preform is composed of a high-density high-silica cloth 2 (high-density high-silica plain cloth) and a low-density quartz mesh 2, which are connected by layer-by-layer needle punching. After needle punching, the preform is strengthened in the normal direction, thereby increasing the shear strength between the layers of the heat-resistant sleeve.

[0023] A layer of quartz mesh 1 is laid on the inner surface of the preform, and then covered with two layers of high silica cloth 2. For the overlap of the high silica cloth 2, the overlap width is 10-50mm, and the overlap is sutured with a quartz fiber suture thread, which is not specifically shown in the figure, and the suture needle distance is 10-20mm. Then, a layer of quartz mesh 1 is laid thereon, and acupuncture is performed, and the acupuncture density is 10-30 needles / cm2. Finally, two layers of high silica cloth 2 and a layer of quartz mesh 1 are used as a unit layer, and acupuncture is performed layer by layer to achieve the required thickness of 5-50mm;

[0024] The surface density of the high silica cloth 2 is 220-360g / m2, the surface density of the quartz mesh tire 1 is 40-180g / m2, the linear density of the quartz fiber suture line is 120-300tex, the lap seams of the high silica cloth 2 are evenly distributed in the circumferential direction, and each layer of the high silica cloth 2 needs to be rotated 60-120 degrees for laying;

[0025] The low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve is based on the weight of the preform, the high-silica cloth accounts for 70%-90%, more preferably 85-90%, and the preparation density of the preform is 0.5-0.7g / cm3;

[0026] The high-performance ablation-resistant phenolic resin is a modified phenolic resin with a solid content of 30-50%, a viscosity of 5-20mP·s, a curing temperature of 80-100°C, a heat preservation time of 1000-2000min, and a heating rate of 0.5-2°C / min.

[0027] The preform preparation process is prepared by the following method:

[0028] A preform core mold is prepared, and a 5-20 mm EV composite material is pasted on the surface of the core mold. Then a layer of quartz mesh tire 1 is laid on the surface of the EV composite material, and then a layer of high silica cloth 2 with a surface density of 220-360 g / m2 is laid, with an overlap width of 10-50 mm, and the overlap positions are sutured with a stitch distance of 10-20 mm. Subsequently, the high silica cloth 2 is rotated 60-120 degrees for layering and suturing, and finally a layer of quartz mesh tire 1 with a surface density of 40-180 g / m2 is covered on its surface for acupuncture with a needle density of 10-30 needles / cm2. After completion, the above operation is followed to prepare the designed thickness of 5-50 mm to prepare a preform.

[0029] The low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve is prepared by the following method:

[0030] The preform is loaded into the molding mold. The preform is 10-30% larger than the mold cavity size as the compression amount. After completion, an airtightness check is performed. It is required to fill with 0.1-0.5MP composite nitrogen for airtightness test. If the pressure drop does not exceed 0.005 in 30-50 minutes, it is considered to be airtight.

[0031] RTM perfusion: The special phenolic resin is weighed and stirred, and then loaded into the glue injection tank for degassing. After degassing for 5-10 minutes under negative pressure at -0.08~-0.09MP, the atmosphere is connected, and 0.1-0.3MP nitrogen is filled into the glue injection tank. The vacuum pump is set to -0.07~-0.09MP and connected to the glue outlet for glue injection. The injection flow rate is 1-10g / s until all the glue outlets are glued. After the glue is discharged, the glue outlet is closed. The glue injection tank is pressurized to 0.3-0.6MP and then the pressure is held to remove bubbles. After completion, all the inlet and outlet ports are closed for curing;

[0032] Curing: Put the mold into the oven and heat and cure it at 80-100℃ for 1000-2000min according to the curing system of the resin, with a heating rate of 0.5-2℃ / min;

[0033] Drying: Leave it at room temperature for 10-20 hours to complete aging, then keep it at 60-70℃ for 500-800min, 80-90℃ for 500-800min, 100-120℃ for 200-500min, and then cool it in the furnace;

[0034] Demolding: After drying, wait until the oven temperature drops below 60°C before taking out the mold, and wait until the mold temperature drops below 40°C before demoulding to produce a low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve.

[0035] Reference Figure 3As shown: From the experimental data, it can be seen that the low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-proof sleeve has excellent ablation and thermal insulation properties. Compared with general heat-proof materials, it has higher specific heat capacity and lower thermal conductivity. In addition, the preparation process is simple. The prepared heat-proof material is close in size, and processing only requires a flat end face. The cost is low, and the prepared composite material has excellent performance. The sample provides a good effect in the detonating cord cutting and cabin opening experiment.

[0036] The utility model has the following advantages:

[0037] The quartz mesh 2 and high silica 1 cloth are needle-punched to form a simple preparation method with controllable density. The normal reinforcement effect of needle-punching greatly improves the interlayer shear strength of the heat-resistant sleeve.

[0038] The resin selected is a high-performance ablation-resistant phenolic resin with a low solid content. After molding, the density is reduced while meeting the ablation requirements, thereby reducing energy loss during flight.

[0039] The vacuum-assisted RTM process is used for preform impregnation and co-curing. The inner and outer steel molds realize the net size forming of the inner and outer surfaces. The outer surface does not need to be processed, which reduces the processing cost and improves the ablation performance.

[0040] It is made of a low-density homogeneous preform and a high-performance ablation-resistant phenolic resin. There will be no energy attenuation when the detonating cord is cut to open the compartment, thus ensuring the smooth opening of the missile warhead compartment.

[0041] In addition, the contents not described in detail in this embodiment are all prior art and common knowledge.

[0042] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve, characterized by: The invention comprises a cylindrical preform, wherein the preform is formed by stacking a plurality of quartz mesh tires (1) and a plurality of high-silica cloths (2) from the inside out and connecting them by needle puncture, wherein the high-silica cloths (2) between adjacent quartz mesh tires (1) are two layers, and the high-silica cloths (2) of the outer layer of the two layers are rotated 60-120 degrees relative to the high-silica cloths (2) of the inner layer, and a resin matrix is ​​formed on the preform by curing through an RTM process; The resin is ablation-resistant phenolic resin with a solid content of 30-50%, a viscosity of 5-20 mP·s, a curing temperature of 80-100° C., a heat preservation time of 1000-2000 min, and a heating rate of 0.5-2° C. / min.

2. A low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve according to claim 1, characterized in that: The preform has an inner diameter of 50-800 mm at the upper end, an inner diameter of 100-1000 mm at the bottom end, a thickness of 5-50 mm, and a height of 500-2000 mm.

3. A low-cost, lightweight, ablation-resistant, high-performance, cuttable heat-resistant sleeve according to claim 1, characterized in that: The surface density of the quartz mesh (1) is 40-180 g / m2, and the surface density of the high-silica cloth (2) is 40-180 g / m2.

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