| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_989ecca69fc47fadd546bf9a0db59629 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23F1-28 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23F1-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B41-91
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B41-5353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22C1-1094
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B32-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B41-009
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22C26-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B32-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B21-064 |
| filingDate |
2013-12-09^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3853f85d5a51c093286698c01f304602 |
| publicationDate |
2020-01-17^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CN-110697703-A |
| titleOfInvention |
Leaching of superhard materials by enhanced demetallization |
| abstract |
The present disclosure relates to methods for enhancing demetallization of ultra-hard materials such as polycrystalline diamond (PCD) or Cubic Boron Nitride (CBN) using thiourea solutions. The thiourea solution may contain thiourea and an acid such as a bronsted acid suitable for leaching. The thiourea may comprise thiourea or substituted thiourea, including tautomers thereof. The superhard material may be exposed to the thiourea solution for a time and under conditions sufficient to remove at least a desired amount of metal from at least a portion of the superhard material, such as a catalyst used during formation of the PCD or CBN. |
| priorityDate |
2013-12-09^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |