1997 Fiscal Year Final Research Report Summary
Preparation of ceramic gas burner head from zero-expansion potassium zirconium phosphate
| Project/Area Number |
07555579
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
無機工業化学
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
OTA Toshitaka (Nagoya Institute of Technology, Faculty of Engineering, Associate professor), 工学部, 助教授 (30135412)
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| Co-Investigator(Kenkyū-buntansha) |
KOISHI Makoto (Nihon Ceramics Co., Head of NC factory), NC工場, 工場長
KATAGIRI Naruhito (Rinnai Corporation, Researcher), 開発部, 研究員
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| Project Period (FY) |
1995 – 1997
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| Keywords | Ceramics / burner-head / Potassium zirconium phosphate / thermal expansion |
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| Research Abstract |
Some compounds in the NaZr_2 (PO_4) _3 family have been reported in recent years to be low thermal expansion materials. In particular, KZr_2 (PO_4) _3 [KZP] ceramic showed a near zero thermal expansion, since the thermal expansion coefficients of KZP crystal were alpha_a= -4.4*10^<-6>/ﾟC,alpha_c= +7.6*10^<-6>/ﾟC,and alpha_<avg>= -0.4*10^<-6>/ﾟC.Consequently, the KZP ceramic is expected to have an exellent thermal shock resistance. In this work, a ceramic gas burner-head was developed from KZP.KZP was synthesized by calcining at 1200-1300ﾟC for 2 h from (ZR) _2P_2O_7 and KH_2PO_4. Sintering of KZP ceramic was promoted by adding ametal oxide such as MgO.The dense KZP ceramic was prepared by sintering at 1250-1350ﾟC.The maximum strength of KZP ceramic was about 150MPa. The linear thermal expansion coefficient of KZP ceramic was near zero. KZP ceramic burner-head was formed by die-pressing of KZP semi-dry powder. As regarding thermal shock resistance, the obtained KZP ceramic burner-head did not crack by quenching from 800ﾟC into ice water, and even after the quenching from 800ﾟC was repeated several times.
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Research Products
(2 results)
