초록 ▼

Ceramic powders selected from the group (a) consisting of ZrB2, HfB2, ZfC, ZrN and HfN and ceramic powders selected from the group (b) consisting of TiC, TiN and TiO2 are mixed, the mixture is sintered in a non-oxidizing atmosphere, a substitution reaction of chemical elements between the compound o

Ceramic powders selected from the group (a) consisting of ZrB2, HfB2, ZfC, ZrN and HfN and ceramic powders selected from the group (b) consisting of TiC, TiN and TiO2 are mixed, the mixture is sintered in a non-oxidizing atmosphere, a substitution reaction of chemical elements between the compound of the ceramic powders of the group (a) and the compound of the ceramic powders of the group (b) is caused in the sintering, and a ceramic composite substantially comprising compounds which do not belong to the groups (a) and (b) is produced by the substitution reaction. By this process, the affection of the particle size and the aggregation of raw powders to the sintering can be greatly reduced, the ranges of the applicable sintering conditions can be broadened, and dense ceramic composites having fine crystal grains and having excellent mechanical properties can be obtained.

대표청구항 ▼

A process for producing a ceramic composite comprising the steps of: mixing at least one ceramic powder consisting of a compound selected from group (a) and at least one ceramic powder consisting of a compound selected from group (b), (a)=ZrB2, HfB2, ZrC, HfC, ZrN, HfN, (b)=Tic, TiN, TiO2; sintering

A process for producing a ceramic composite comprising the steps of: mixing at least one ceramic powder consisting of a compound selected from group (a) and at least one ceramic powder consisting of a compound selected from group (b), (a)=ZrB2, HfB2, ZrC, HfC, ZrN, HfN, (b)=Tic, TiN, TiO2; sintering the mixture in a non-oxidizing atmosphere causing a substitution reaction of the chemical elements of the group (a) compounds and the group (b) compounds to occur; and forming a ceramic composite comprising at least two compounds selected from group (a′) and group (b′), respectively, (a′)=Ti2, TiC, TiN, (b′)=ZrC, ZrN, ZrO2, HfC, HfN, HfO2, said compounds of groups (a′) and (b′) being made by substituting Zr or Hf from the compounds of group (a) for Ti of the compounds of group (b).