Porous ceramic material and processes for preparing same

A process for the preparation of a porous ceramic material, which comprises the steps of:

• mixing 20 to 300 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 .mu.m and 1 to 5 parts by weight of an organic fiber having a length of 5 .mu.m to 5 mm and a diameter of 1 to 30 .mu.m with 100 parts by weight of a calcium phosphate compound powder;
• press-shaping the thus-obtained mixture into a desired shape and size;
• heating the shaped mixture at a temperature of 200.degree. to 800.degree. C. to remove the sublimable substance by sublimation and carbonize the organic fiber;
• and then,
• heating the shaped mixture at a temperature of 800.degree. to 1,350.degree. C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.

A process for the preparation of a porous ceramic material, which comprises the steps of:

• mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 .mu.m and 1 to 5 parts by weight of an organic fiber having a length of 5 .mu.m to 5 mm and a diameter of 1 to 30 .mu.m with 100 parts by weight of a calcium phosphate compound powder;
• press-shaping the thus-obtained mixture into a desired shape and size;
• heating the shaped mixture at a temperature of 200.degree. to 800.degree. C. to remove the organic synthetic resin by thermal decomposition and carbonize the organic fiber;
• and then,
• heating the shaped mixture at a temperature of 800.degree. to 1,350.degree. C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.

A process for the preparation of a porous ceramic material, which comprises the steps of:

• mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 .mu.m, 2 to 5 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 .mu.m and 1 to 5 parts by weight of an organic fiber having a length of 5 .mu.m to 5 mm and a diameter of 1 to 30 .mu.m with 100 parts by weight of a calcium phosphate compound powder;
• press-shaping the thus-obtained mixture into a desired shape and size;
• heating the shaped mixture at a temperature of 200.degree. to 800.degree. C. to remove the organic synthetic resin particles by thermal decomposition, carbonize the organic fiber and remove the sublimable substance particles by sublimation;
• and then,
• heating the shaped mixture at a temperature of 800.degree. to 1,350.degree. C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.