Reactive sintering connection method for silicon carbide ceramic biscuits

A technology for sintering silicon carbide and ceramic green bodies, which is applied in 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, the thermal stress of the joint is large, and the bonding strength is low. The effect of eliminating thermal mismatch, high bond strength, ensuring surface accuracy and surface roughness

Active Publication Date: 2015-09-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • 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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  • Reactive sintering connection method for silicon carbide ceramic biscuits
  • Reactive sintering connection method for silicon carbide ceramic biscuits
  • Reactive sintering connection method for silicon carbide ceramic biscuits

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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 reactive sintering connection method for silicon carbide ceramic biscuits and belongs to the technical field of manufacturing of silicon carbide ceramic biscuits. The reactive sintering connection method for silicon carbide ceramic biscuits solves the technical problems that as a connection method for silicon carbide ceramic biscuits in the prior art can not reduce thermal mismatch between connecting materials and base metal to be connected, thermal stress of connectors is high, combination intensity is low and operation is complex. The reactive sintering connection method for silicon carbide ceramic biscuits includes the steps that a mould is parted into a first area and a second area through a partition plate; the inner surface of the portion, in the first area, of the mould and the surface of the partition plate are processed; then the first area is grouted and solidified; the partition plate and a metal film are removed after obtained silicon carbide biscuits are moisturized; and the second area is grouted and solidified after the connection surface is coated with a water-based initiating agent, and silicon carbide ceramic connecting pieces are obtained after conducting pre-sintering and reactive sintering on silicon carbide ceramic connecting piece biscuits. By means of the reactive sintering connection method for silicon carbide ceramic biscuits, it can be guaranteed that connectors have no defect or stress, and the bonding strength is high.

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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IPC IPC(8): B28B1/00C04B35/565
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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