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Connection method of reaction sintered silicon carbide ceramic green body

A technology for sintering silicon carbide and ceramic green bodies, which is applied to ceramic molding machines, manufacturing tools, etc., can solve the problems of inability to reduce the thermal mismatch between the connecting material and the base material to be connected, large thermal stress of the joint, and low bonding strength. The effect of eliminating thermal mismatch, high bond strength, ensuring surface accuracy and surface roughness

Active Publication Date: 2017-06-09
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems that the connection method of silicon carbide ceramic green bodies in the prior art cannot reduce the thermal mismatch between the connecting material and the base material to be connected, resulting in large thermal stress of the joint, low bonding strength, and complicated operation. , providing a method for connecting reaction sintered silicon carbide ceramic green bodies

Method used

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  • Connection method of reaction sintered silicon carbide ceramic green body
  • Connection method of reaction sintered silicon carbide ceramic green body
  • Connection method of reaction sintered silicon carbide ceramic green body

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preparation example Construction

[0039] Wherein, ethanol-based initiator is the ethanol solution containing polyvinyl butyral and APS, and the concentration of polyvinyl butyral is 60-140g / L, and the concentration of APS is 1.5-8g / 100ml, and ethanol is analytically pure, for making The dispersion is better, and the particle size of APS is generally within 10 μm. The present invention provides a method for preparing the above-mentioned ethanol-based initiator, but is not limited thereto: first dissolve polyvinyl butyral in ethanol, mix evenly, and obtain an ethanol-based solution, and the concentration of polyvinyl butyral in the ethanol-based solution is 60 -140g / L, then grind the APS until the particle size is less than or equal to 10μm, and then disperse the ground APS particles in the ethanol-based solution to obtain the ethanol-based suspension of APS, which is the ethanol-based initiator. In the silicon carbide slurry, the primary free radicals formed by the homolysis of the initiator activate the polyme...

Embodiment 1

[0057] Connection method of reaction sintered silicon carbide ceramic green body:

[0058] Step 1, mold is divided into 1# and 2# two zones with detachable dividing plate, brush one deck ethanol-based initiator (the concentration of polyvinyl butyral is 60g / L at the inner surface of the mold of 1# zone , the concentration of APS is 3.5g / 100ml), paste tin foil on the surface of the partition in 1# area;

[0059] Step 2: Inject silicon carbide slurry (solid content: 60vol.%) into the 1# area, and solidify at 18°C ​​for 1.5 hours to obtain silicon carbide green body;

[0060] Step 3: Perform moisturizing treatment on the silicon carbide biscuit in the 1# area, and the moisturizing time is 5 hours;

[0061] Step 4. After removing the separator and tin foil, paint a water-based initiator on the connecting surface of the silicon carbide green body. The concentration of APS in the water-based initiator is 8g / 100ml;

[0062] Step 5. After the water-based initiator is applied for 0.5...

Embodiment 2

[0067] Connection method of reaction sintered silicon carbide ceramic green body:

[0068] Step 1, mold is divided into two zones of 1# and 2# with detachable dividing plate, brushes one deck ethanol base initiator (the concentration of polyvinyl butyral is 80g / L at the inner surface of the mold of 1# zone , the concentration of APS is 8g / 100ml), paste aluminum foil on the surface of the partition in 1# area;

[0069] Step 2: Inject silicon carbide slurry (solid content: 62.5vol.%) into the 1# area, and solidify at 25°C for 2 hours to obtain a silicon carbide green body;

[0070] Step 3: Perform moisturizing treatment on the silicon carbide biscuit in the 1# area, and the moisturizing time is 10 hours;

[0071] Step 4. After removing the separator and tin foil, paint a water-based initiator on the connecting surface of the silicon carbide green body. The concentration of APS in the water-based initiator is 8g / 100ml;

[0072] Step 5: After painting with the water-based initia...

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Abstract

The invention discloses a connection method of reaction sintered silicon carbide ceramic green body, and belongs to the technical field of silicon carbide ceramic green body preparation. It solves the technical problems that the connection method of the silicon carbide ceramic green body in the prior art cannot reduce the thermal mismatch between the connecting material and the base material to be connected, resulting in large thermal stress, low bonding strength and complicated operation of the joint. In the method of the present invention, the mold is first divided into 1# and 2# regions through the partition plate, then the inner surface of the mold in the 1# region and the surface of the partition plate are treated, and then the 1# region is grouted and cured, After moisturizing the obtained silicon carbide blank, remove the separator and metal film, and apply water-based initiator on the connecting surface, grouting and solidify the 2# area, and the obtained silicon carbide connecting piece blank is pre-sintered and cured. After reaction sintering, a silicon carbide ceramic connector is obtained. The method can ensure that the joint has no defects, no stress and high bonding strength.

Description

technical field [0001] The invention belongs to the technical field of preparing silicon carbide ceramic green bodies, and in particular relates to a connection method of reaction sintered silicon carbide ceramic green bodies. Background technique [0002] In order to improve the resolution of large-scale space remote sensing systems, total reflection or catadioptric optical systems with long focal lengths and large relative apertures are usually used. It increases exponentially, and the difficulty of preparing mirrors is greatly increased. Secondly, due to the increase in the size of the mirror, defects such as air holes in the mirror blank increase significantly during the manufacturing process, and the yield of the mirror also decreases accordingly, which leads to an increase in the manufacturing cost of the mirror. [0003] At present, the commonly used connection methods for ceramic parts include gluing, welding and so on. Adhesive bonding has the characteristics of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565
CPCB28B1/002C04B35/565
Inventor 王兴张舸赵汝成赵文兴
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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