SiC Ceramic Membrane Low-Temperature Sintering
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Solution Overview
Problem
Current ceramic membranes for water treatment face challenges with high sintering temperatures, mechanical strength, chemical stability, and fouling resistance, particularly due to the high sintering temperature of silicon carbide (SiC) materials, which hinders their commercialization and effectiveness in severe conditions.
Innovation Solution
A ceramic membrane is developed using a SiO2 oxide layer formed on SiC particles with a porous ceramic support layer, sintered at a low temperature of 1,050°C or less, incorporating SiC particles with an average diameter of 1 μm or less, and a SiC layer with pores of 0.05 μm to 0.5 μm in diameter, to enhance durability and water permeance while preventing defects from coating layer contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If SiC materials are used for ceramic membranes, then fouling resistance is improved due to negative surface charge, but sintering temperature becomes too high (1800°C or greater) for economical manufacturing
Solution Approach 1:
The invention changes the sintering temperature parameter from the conventional 1800°C or greater to 1000-1200°C by using a low-temperature sintering process with a binder, enabling economical manufacturing while maintaining SiC's fouling resistance properties
Solution Approach 2:
The invention creates a composite structure where SiC particles are combined with a binder material that enables low-temperature sintering. The binder acts as a temporary matrix during sintering that decomposes and leaves behind a porous SiC structure, achieving both low processing temperature and desired mechanical properties
2Temperature
If low melting point glass components and clay components are added to reduce sintering temperature, then sintering temperature can be lowered, but reaction temperature cannot be reduced to 1300°C or less while maintaining excellent durability
Solution Approach 1:
The invention extracts and removes the glass components and clay components from the SiC-based membrane composition. By eliminating these additives, the invention achieves low-temperature sintering (1000-1200°C) without compromising durability, as the binder-based approach provides both low-temperature processing and mechanical strength without the limitations of glass/clay additives
3Ease of manufacture
If alumina materials are used for ceramic membranes, then manufacturing is easier and more economical, but surface is positively charged causing accelerated contamination by fouling of negatively charged organic substances
Solution Approach 1:
The invention changes the surface charge parameter from positive (alumina) to negative (SiC) by selecting silicon carbide as the base material. This parameter change fundamentally alters the interaction with negatively charged organic substances, providing fouling resistance while maintaining manufacturability through low-temperature sintering process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach allows for the production of ceramic membranes with improved durability, water permeance, and resistance to fouling, achieving water permeance of 400 L·m−2·h−1·bar−1 or higher, while reducing the sintering temperature and preventing defects, making the process economically feasible and effective for water treatment applications.
Implementation Method 1
a SiO2 oxide layer formed on a surface of SiC particles by the sintering
Data Source
AI summary
Disclosed are a ceramic membrane for water treatment using oxidation-treated SiC and a method for manufacturing the same. An object of the present invention is to manufacture a ceramic membrane for water treatment, which can be sintered at a low temperature of 1,050° C. or less, in which a SiO2 oxide layer formed during an oxidation process induces volume expansion so as to prevent defects due to the contraction of a coating layer during general sintering. The ceramic membrane for water treatment using the oxidation treated SiC includes a porous ceramic support layer; and a SiC layer formed on the porous ceramic support layer and including SiC particles on which a SiO2 oxide layer formed on a surface thereof.