Abstract
Because Silicon carbide (SiC) ceramics have various excellent properties, the demand for larger and complicated shapes has been increasing. This paper introduces an innovative method that would not require a large furnace, and further, would minimize the production cost and the thermal history, namely the “flash-bonding” technique. The borosilicate glass with low thermal expansion coefficient, Pyrex glass, was selected as the brazing material. In this work, as-is or surface-oxidized SiC plates were joined using Pyrex glass as brazing material, and the reaction and wetting of Pyrex glass on as-is or surface-oxidized SiC plate were investigated. It was found that the protective film of the surface-oxidized SiC lowered the oxygen partial pressure, and hence, generated many pores in the interface.
Highlights
With the development of aerospace, nuclear power, semiconductor industry, and so on, a demand for high performance materials that can bear under harsh conditions has been rising [1] [2]
The severe deformation and pore generation in the sessile drops would be due to the gas evolution that caused by the reaction between reaction sintering (RS)-Silicon carbide (SiC) and Pyrex glass and/or residual oxygen gas, which will be discussed later in detail
It was observed that the SiC/joining layer made of the as-is SiC plates had almost no pores, and its color was blackened, and in contrast, the SiC/joining layer made of the surface-oxidized SiC had a large amount of pores, and its color remained colorless and transparent
Summary
With the development of aerospace, nuclear power, semiconductor industry, and so on, a demand for high performance materials that can bear under harsh conditions has been rising [1] [2]. Mo foil was sandwiched between two SiC plates and hot-pressed at 1500 ̊C in a vacuum to yield joined parts with bending strength of 263 MPa [15], and joined parts by the laser heating technique using a SiO2-Al2O3-Y2O3-based oxide ceramic as an interlayer material enabled average joining strength as high as 319 MPa [16]. In the former method, an electric furnace was used for heating the joint, when manufacturing a large joined body, its size would be restricted by the size of the furnace used. The local heating by the laser irradiation would excessively heat the joint to deteriorate the mechanical properties of a joined body, which would severely require the thermal property matching of the ceramic base and the interlayer material [16]
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