Preparation method of Y2SiO5 whisker toughened mullite composite coating

Abstract

Provided is a preparation method of a Y2SiO5 whisker toughened mullite composite coating. The method includes that first, a SiC porous inner coating is prepared on the surface of a C / C composite material substrate through an embedding method, and then Y2SiO5 whisker is prepared, surface modification is conducted on the Y2SiO5 whisker by using a composite surface active agent to obtain mixed liquid; the C / C composite material with the SiC porous inner coating prepared on the surface and the mixed liquid are adopted for ultrasonic electrophoresis selectively assembling and depositing to obtain a Y2SiO5 whisker pinning layer, and finally the Y2SiO5 whisker toughened mullite composite coating is prepared through a hydrothermal electrophoretic deposition method. A coating structure of a composite material of the Y2SiO5 whisker toughened mullite is adopted, a composite principle is used, and advantages of mullite and Y2SiO5 whisker are used, so that an anti-scouring shear stress effect of the coating is improved, and simultaneously oxidation resistance can be greatly improved. Compared with other coatings, the coating can effectively increase oxidation resistant temperature and can obtain anti-oxidation protection on the C / C composite material for 350h under the condition of high-temperature gas dynamic scouring at the temperature of 1700 DEG C, and oxidization weightless rate is smaller than 0.8%.

Description

technical field

[0001] The invention relates to a preparation method of a C / C composite high-temperature anti-oxidation coating, in particular to a Y 2 SiO 5 Preparation method of whisker toughened mullite composite coating. Background technique

[0002] Carbon / carbon (C / C) composites have excellent properties such as low thermal expansion coefficient, low density, high temperature resistance, ablation resistance, high strength, high modulus, etc. The excellent performance that the amount increases with the increase of temperature makes it have broad application prospects in the aerospace field. However, C / C composites will be oxidized in an aerobic environment exceeding 450 °C, and the loss of oxidized mass will lead to a decrease in its strength, which limits its practical application. Therefore, solving the problem of high-temperature oxidation resistance of C / C composites is the key to making full use of their properties.

[0003] There are two main ways to improve t...

Examples

Embodiment 1

[0034] Step 1: C / C composite material pretreatment:

[0035] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 20×20×20mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 55°;

[0036] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 times respectively, the ultrasonic time for each cleaning is 80min, the ultrasonic power is 200W, and finally dry in an electric blast drying oven at 70°C;

[0037] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0038] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder = 4:4:1.8 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0039]...

Embodiment 2

[0052] Step 1: C / C composite material pretreatment:

[0053] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 18×18×18mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 60°;

[0054] 2) Then use deionized water and absolute ethanol to ultrasonically clean 4 times respectively, the ultrasonic time for each cleaning is 50min, the ultrasonic power is 180W, and finally dry in an electric blast drying oven at 75°C;

[0055] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0056] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 powder=3.5:5:2 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0057] 2...

Embodiment 3

[0069] Step 1: C / C composite material pretreatment:

[0070] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 15×15×15mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 50°;

[0071] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times respectively, the ultrasonic time of each cleaning is 60min, the ultrasonic power is 160W, and finally dry in an electric blast drying oven at 80°C;

[0072] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0073] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder=3:4.5:1.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0074] 2)...

technical field

[0001] The invention relates to a preparation method of a C / C composite high-temperature anti-oxidation coating, in particular to a Y 2 SiO 5 Preparation method of whisker toughened mullite composite coating. Background technique

[0002] Carbon / carbon (C / C) composites have excellent properties such as low thermal expansion coefficient, low density, high temperature resistance, ablation resistance, high strength, high modulus, etc. The excellent performance that the amount increases with the increase of temperature makes it have broad application prospects in the aerospace field. However, C / C composites will be oxidized in an aerobic environment exceeding 450 °C, and the loss of oxidized mass will lead to a decrease in its strength, which limits its practical application. Therefore, solving the problem of high-temperature oxidation resistance of C / C composites is the key to making full use of their properties.

[0003] There are two main ways to improve t...

Examples

Embodiment 1

[0034] Step 1: C / C composite material pretreatment:

[0035] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 20×20×20mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 55°;

[0036] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 times respectively, the ultrasonic time for each cleaning is 80min, the ultrasonic power is 200W, and finally dry in an electric blast drying oven at 70°C;

[0037] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0038] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder = 4:4:1.8 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0039]...

Embodiment 2

[0052] Step 1: C / C composite material pretreatment:

[0053] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 18×18×18mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 60°;

[0054] 2) Then use deionized water and absolute ethanol to ultrasonically clean 4 times respectively, the ultrasonic time for each cleaning is 50min, the ultrasonic power is 180W, and finally dry in an electric blast drying oven at 75°C;

[0055] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0056] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 powder=3.5:5:2 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0057] 2...

Embodiment 3

[0069] Step 1: C / C composite material pretreatment:

[0070] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 15×15×15mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 50°;

[0071] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times respectively, the ultrasonic time of each cleaning is 60min, the ultrasonic power is 160W, and finally dry in an electric blast drying oven at 80°C;

[0072] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0073] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder=3:4.5:1.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0074] 2)...

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