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CN-121985438-A - Corrosion-resistant high-power-density high-temperature-resistant ceramic slurry and preparation method thereof

CN121985438ACN 121985438 ACN121985438 ACN 121985438ACN-121985438-A

Abstract

The invention provides corrosion-resistant high-power density high-temperature-resistant ceramic slurry and a preparation method thereof, and belongs to the field of inorganic nonmetallic materials. The invention provides corrosion-resistant high-power-density high-temperature-resistant ceramic slurry which comprises, by weight, 15-25 parts of reduced graphene oxide, 45-50 parts of o-cresol formaldehyde epoxy resin, 6-8 parts of a curing agent, 2-4 parts of a dispersing agent, 3-5 parts of a silane coupling agent, 20-25 parts of a solvent and 4-6 parts of a functional filler. The volume resistivity of the slurry is 1 multiplied by 10 ‑3 ～5×10 ‑3 ohm cm, the power density is not less than 10W/cm 2 , the slurry is stable for a long time at 300 ℃ and is accompanied with heat, the slurry has no obvious corrosion in a 1000h salt spray test, and the adhesive force and the thermal cycle stability are excellent.

Inventors

  • Xue Guoming
  • HAO YALEI
  • CHEN BOAN
  • XU JIE

Assignees

  • 成都阳湾商业管理有限公司

Dates

Publication Date
20260505
Application Date
20251225

Claims (10)

  1. 1. The corrosion-resistant high-power-density high-temperature-resistant ceramic slurry is characterized by comprising the following raw materials in parts by weight: 15-25 parts of reduced graphene oxide, 45-50 parts of o-cresol formaldehyde epoxy resin, 6-8 parts of curing agent, 2-4 parts of dispersing agent, 3-5 parts of silane coupling agent, 20-25 parts of solvent and 4-6 parts of functional filler.
  2. 2. The corrosion-resistant high power density refractory ceramic slurry recited in claim 1, wherein: Wherein the sheet diameter of the reduced graphene oxide is 4-6 mu m, the thickness is 1.5-2nm, and the specific surface area is 500-650m 2 /g.
  3. 3. The corrosion-resistant high power density refractory ceramic slurry recited in claim 1, wherein: wherein the epoxy value of the o-cresol formaldehyde epoxy resin is 0.6-0.7eq/100g, and the softening point is 80-85 ℃.
  4. 4. The corrosion-resistant high power density refractory ceramic slurry recited in claim 1, wherein: wherein the curing agent is selected from any one of dicyandiamide curing agent, imidazole curing agent or dicyandiamide-imidazole compound curing agent.
  5. 5. The corrosion-resistant high power density refractory ceramic slurry recited in claim 1, wherein: wherein the dispersing agent is polycarboxylate dispersing agent or polyurethane dispersing agent.
  6. 6. The corrosion-resistant high power density refractory ceramic slurry according to claim 1, wherein, Wherein the silane coupling agent is KH-550 or KH-560.
  7. 7. The corrosion-resistant high power density refractory ceramic slurry according to claim 1, wherein, Wherein the solvent is selected from any one or more of acetone, ethylene glycol diethyl ether or N, N-dimethylformamide.
  8. 8. The corrosion-resistant high power density refractory ceramic slurry according to claim 1, wherein, Wherein the particle size of the functional filler is 0.5-1 mu m, The functional filler is selected from any one or more of boron nitride, silicon carbide or aluminum oxide.
  9. 9. A method for preparing the corrosion-resistant high-power-density high-temperature-resistant ceramic slurry, which is characterized by being used for preparing the corrosion-resistant high-power-density high-temperature-resistant ceramic slurry according to any one of claims 1 to 8, and comprising the following steps: Adding a dispersing agent and a silane coupling agent into a solvent, uniformly mixing, adding reduced graphene oxide, and dispersing to obtain a graphene dispersion liquid; mixing a resin matrix, namely adding melted o-cresol formaldehyde epoxy resin into the graphene dispersion liquid, stirring, adding functional filler, and stirring to obtain primary mixed slurry; Cooling the primary mixed slurry to room temperature, adding a curing agent, and uniformly stirring to obtain mixed slurry; And (3) a post-treatment step of grinding the mixed slurry by using a three-roller machine, and carrying out vacuum defoaming to obtain the corrosion-resistant high-power-density high-temperature-resistant carbon ceramic slurry.
  10. 10. The method for preparing the corrosion-resistant high-power-density high-temperature-resistant ceramic slurry according to claim 9, wherein, Wherein the reduced graphene oxide and the o-cresol formaldehyde epoxy resin are also pretreated, The pretreatment step of the reduced graphene oxide comprises the steps of placing the reduced graphene oxide in an environment of 90-110 ℃ and drying in vacuum for 5-10h to obtain the reduced graphene oxide; the pretreatment step of the o-cresol formaldehyde epoxy resin comprises the steps of heating the o-cresol formaldehyde epoxy resin to 85-100 ℃, and stirring until the o-cresol formaldehyde epoxy resin is completely melted.

Description

Corrosion-resistant high-power-density high-temperature-resistant ceramic slurry and preparation method thereof Technical Field The invention relates to the field of inorganic nonmetallic materials, in particular to a corrosion-resistant high-power density high-temperature-resistant ceramic slurry and a preparation method thereof. Background The electrothermal conversion technology is widely applied to various fields such as industrial heating (such as pipeline heat tracing and die heating), new energy equipment (such as power battery heat management and fuel cell stack heating), aerospace heat control (such as spacecraft anti-icing system and airborne equipment temperature control), medical equipment (such as physiotherapy instrument heating module) and the like, and the core performance of the electrothermal conversion technology directly depends on the conductive efficiency, environmental adaptability and structural stability of electrothermal conversion slurry. Along with the rapid development of terminal equipment towards high power, miniaturization, integration and severe working conditions (such as long-term exposure to 200-500 ℃ high-temperature environment, acid-base medium corrosion and frequent cold and hot cycle impact), more severe requirements are put on the comprehensive performance of electrothermal conversion slurry, namely extremely low volume resistivity (less than or equal to 5 multiplied by 10 -3 omega cm) is required to realize electrothermal conversion with high power density (more than or equal to 10W/cm 2), excellent high temperature resistance (no performance attenuation after long-term use at more than 300 ℃), corrosion resistance (stable performance after soaking for more than 72 hours in an acid-base environment with pH=2-12 and a common organic solvent), mechanical stability (no cracking and falling after film formation, adhesive force is more than or equal to 4B) and long-term service reliability (service life is more than or equal to 5000 h). At present, main stream electrothermal conversion slurry in the market is mainly divided into two types of metal-based slurry and traditional carbon-based slurry, and the two types of metal-based slurry and traditional carbon-based slurry have obvious short plates in performance and application scenes, so that the severe requirements of high-end fields are difficult to meet. The metal-based slurry (such as silver slurry, copper slurry, nickel slurry and the like) is widely applied under the working conditions of medium and low power and normal temperature by virtue of excellent conductivity (volume resistivity is usually 1 multiplied by 10 -4-1×10-3 ohm cm) of metal powder (such as silver powder and copper powder), but the defects that the metal powder (especially silver and copper) is easy to oxidize and sinter and agglomerate in the high-temperature environment with the temperature above 150 ℃ exist in the high-power and severe environment, so that a conductive path after the slurry is formed is damaged, the electrothermal conversion efficiency is suddenly attenuated along with the service time, for example, the volume resistivity of the silver slurry can be increased by more than 50 percent after the silver slurry is kept at the constant temperature of 200 ℃ for 100 hours, and the power density is reduced to be below 40 percent of the initial value, so that the long-term stable working requirement under the high-temperature working condition can not be met; the metal powder is easy to generate electrochemical corrosion in acid-base medium and high humidity environment to form an oxide layer or corrosion product, so that the conductivity is lost, for example, copper paste is obviously corroded after being soaked in 5% sulfuric acid solution for 24 hours, the surface is copper green, the resistivity is risen to 10 times of the initial value, the electrothermal conversion function is completely lost, the price of noble metal raw materials such as silver, copper and the like is high, the unit area use cost of the metal-based paste is 5-10 times that of the carbon-based paste, particularly in high-power and large-area electrothermal conversion scenes (such as large-scale pipeline heat tracing and photovoltaic assembly snow melting systems), the economy of large-scale application is extremely poor, the thermal expansion coefficient difference between metal and a base material (such as ceramic and metal base plate) is large, and in the frequent cold and hot circulation (-40 ℃ to 200 ℃) process, interfacial peeling and cracking are easy to occur, and the paste is easy to fall off and lose efficacy. The traditional carbon-based slurry takes carbon black, graphite, chopped carbon fiber and the like as conductive phases, and common epoxy resin, polyurethane, acrylic resin and the like as film-forming resins, although the cost is lower and the corrosion resistance is superior to that of metal-based slurry, the core performance is obviously insuff