Filter, method of manufacturing the same, and exhaust gas purification device

A method of manufacturing a filter for removing particulate materials contained in exhaust gas, the method comprising:

• a raw material mixing step that mixes ceramic particles having a predetermined average particle diameter, and fine particles that are the same material as the ceramic particles and have an average particle diameter being smaller than the predetermined average particle diameter to form a puddle;
• and
• a molding and firing step that molds the puddle to obtain a molded object and fires the molded object in a coexistence with a reduction-resistant material or a precursor thereof that is reduced by carbon contained in the particulate materials at a higher temperature than a temperature at which an oxide of an element contained in the ceramic particles is reduced, thereby sintering the molded object and allowing the ceramic particles protective material composed of the reduction-resistant material or the precursor thereof to exist on a surface of the ceramic particles.

A method of manufacturing a filter for removing particulate materials contained in exhaust gas, the method comprising:

• a raw material mixing step that mixes ceramic particles having a predetermined average particle diameter, fine particles that are the same material as the ceramic particles and have an average particle diameter being smaller than the predetermined average particle diameter, and a reduction-resistant material or a precursor thereof that is reduced by carbon contained in the particulate materials at a higher temperature than a temperature at which an oxide of an element contained in the ceramic particles is reduced to form a puddle;
• and
• a molding and firing step that molds the puddle to obtain a molded object and fires the molded object, thereby sintering the molded object and allowing the ceramic particles protective material composed of the reduction-resistant material or the precursor thereof to exist on a surface of the ceramic particles.

An exhaust gas purification device for removing particulate materials contained in exhaust gas from an internal combustion engine, comprising:

• a connecting pipe connected to the internal combustion engine and through which exhaust gas from the internal combustion engine flows;
• and
• a filter housing connected to the connecting pipe and accommodating a filter including ceramic particles as an aggregate and a ceramic particles protective material that is present on a surface of the ceramic particles and composed of a reduction-resistant material or a precursor thereof being reduced by carbon contained in the particulate materials at a higher temperature than a temperature at which an oxide of an element contained in the ceramic particles is reduced.