Ceramic/aluminum bonded body, insulating substrate, led module, ceramic member, method for producing ceramic/aluminum bonded body, and method for producing insulating substrate

An insulating substrate comprising:

• a ceramic substrate;
• and
• an aluminum plate formed of aluminum or an aluminum alloy,
• wherein the ceramic substrate and the aluminum plate are bonded to each other,
• the ceramic substrate has a ceramic main body formed of silicon nitride and an aluminum nitride layer or an aluminum oxide layer formed on a surface of the ceramic main body to which the aluminum plate is bonded, and the aluminum plate is bonded to the ceramic substrate through the aluminum nitride layer or the aluminum oxide layer,
• the ceramic main body is provided with silicon nitride phases and a glass phase formed between the silicon nitride phases, and
• Al is present in a portion of the glass phase of the ceramic main body at an interface with the aluminum nitride layer or the aluminum oxide layer.

A ceramic member comprising:

• a ceramic main body formed of silicon nitride;
• and
• an aluminum nitride layer or an aluminum oxide layer formed on a surface of the ceramic main body,
• wherein the ceramic main body is provided with silicon nitride phases and a glass phase formed between the silicon nitride phases, and
• Al is present in a portion of the glass phase of the ceramic main body at an interface with the aluminum nitride layer or the aluminum oxide layer.