Sintered body of titanium compound

Abstract

The present invention provides a sintered body of titanium compound obtained by sintering the titanium compound and a method for producing the same. A titanium compound represented by the formula (1) or (2) below is sintered. [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1) [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2   (2) (In the formulae, n is an integer of from 0 to 3). The obtained sintered body substantially consists of perovskite and whitlokite.

1 . A titanium compound represented by the following formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       2 . A sintered body obtained by sintering a titanium compound.  
   
   
       3 . The sintered body as claimed in  claim 2 , wherein the titanium compound is represented by the following formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       4 . The sintered body as claimed in  claim 2 , wherein the titanium compound is produced by adding an alkali to a solution containing a calcium ion, a titanium ion and phosphoric ion, thereby coprecipitating.  
   
   
       5 . A sintered body comprising perovskite and whitlockite.  
   
   
       6 . A sintered body substantially consisting of perovskite and whitlockite.  
   
   
       7 . The sintered body as claimed in  claim 5 , wherein the perovskite and whitlockite are obtained by sintering a titanium compound.  
   
   
       8 . The sintered body as claimed in  claim 7 , wherein the titanium compound is represented by the formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       9 . The sintered body as claimed in  claim 7 , wherein the titanium compound is produced by adding an alkali to a solution containing a calcium ion, a titanium ion and phosphoric ion, thereby coprecipitating.  
   
   
       10 . A method for producing a sintered body, sintering a titanium compound.  
   
   
       11 . The production method as claimed in  claim 10 , wherein the titanium compound is represented by the formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       12 . The production method as claimed in  claim 10 , wherein the titanium compound is produced by adding an alkali to a solution containing a calcium ion, a titanium ion and phosphoric ion, thereby coprecipitating.  
   
   
       13 . The production method as claimed in  claim 10 , wherein the sintering is conducted at a temperature exceeding 800° C.  
   
   
       14 . The production method as claimed in  claim 10 , wherein the sintering is conducted under an inert gas atmosphere and/or under reduced pressure.  
   
   
       15 . The production method as claimed in  claim 14 , wherein the inert gas is xenon and/or argon.  
   
   
       16 . The production method as claimed in  claim 14 , wherein the sintering is conducted under a pressure of 10 −4  Pa or lower.  
   
   
       17 . A sintered body obtained by sintering a mixture containing a titanium compound and an inorganic substance.  
   
   
       18 . The sintered body as claimed in  claim 17 , wherein the titanium compound is represented by the formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       19 . The sintered body as claimed in  claim 17 , wherein the titanium compound is produced by adding an alkali to a solution containing a calcium ion, a titanium ion and phosphoric ion, thereby coprecipitating.  
   
   
       20 . The sintered body as claimed in  claim 17 , wherein the inorganic substance is at least one selected from the group consisting of calcium hydroxyapatite, calcium fluoroapatite, β-tricalcium phosphate, α-tricalcium phosphate, tetracalcium phosphate, metallic titanium, titanium oxide and platinum.  
   
   
       21 . A method for producing a sintered body, sintering a mixture containing a titanium compound and an inorganic substance.  
   
   
       22 . The production method as claimed in  claim 21 , wherein the titanium compound is represented by the formula (1) or (2):  
       [Ca 10 (PO 4 ) 6 ]TiO 3 .nH 2 O   (1)  [Ca 10 (PO 4 ) 6 ]TiO 2 (OH) 2    (2)  
     (In the formulae, n is an integer of from 0 to 3).  
   
   
       23 . The production method as claimed in  claim 21 , wherein the titanium compound is produced by adding an alkali to a solution containing a calcium ion, a titanium ion and phosphoric ion, thereby coprecipitating.  
   
   
       24 . The production method as claimed in  claim 21 , wherein the inorganic substance is at least one selected from the group consisting of calcium hydroxyapatite, calcium fluoroapatite, β-tricalcium phosphate, α-tricalcium phosphate, tetracalcium phosphate, metallic titanium, titanium oxide and platinum.  
   
   
       25 . The production method as claimed in  claim 21 , wherein the sintering is conducted at a temperature exceeding 800° C.  
   
   
       26 . The production method as claimed in  claim 21 , wherein the sintering is conducted under an inert gas atmosphere and/or under reduced pressure.  
   
   
       27 . The production method as claimed in  claim 26 , wherein the inert gas is xenon and/or argon.  
   
   
       28 . The production method as claimed in  claim 26 , wherein the sintering is conducted under a pressure of 10 −4  Pa or lower.  
   
   
       29 . An artificial bone material, an artificial joint material, an artificial tooth material or an artificial dental root material, constituted of the sintered body as claimed in  claim 1 .  
   
   
       30 . An artificial bone material, an artificial joint material, an artificial tooth material or an artificial dental root material, constituted of the sintered body as claimed in  claim 17 .  
   
   
       31 . An artificial bone, an artificial joint, an artificial tooth or an artificial dental root, comprising the sintered body as claimed in  claim 1 .  
   
   
       32 . An artificial bone, an artificial joint, an artificial tooth or an artificial dental root, comprising the sintered body as claimed in  claim 17.